著者

谷脇 満 花田 貴紀 桜井 直樹

出版者

一般社団法人 園芸学会

雑誌

園芸学会雑誌 (ISSN:00137626)

巻号頁・発行日

vol.75, no.5, pp.410-414, 2006

被引用文献数

26

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野菜などの生鮮食品の食感を数値化する方法を開発した.この方法はナイフ形プローブを食品サンプルに突き刺した際の食感信号を,圧電センサーを用いた装置で測定するものである.この際,単位時間当たりに含まれる食感信号の振幅を積算した振幅密度を計算し,これを食感指標として定義した.得られた食感信号を周波数領域で解析するためにオクターブマルチフィルタを使用し,0 Hz から6400 Hz までの範囲で解析した.また,食感信号に含まれている周期的なノイズを取り除く技術も開発した.これはプローブが動き始める前のノイズのデータを,食感信号とノイズが混在している生データから差し引くことによって周期ノイズを取り除くものである.以上の方法を根深ネギに適用し,その食感の特徴を明らかにした.さらに,低周波領域 (0–50 Hz) の食感信号を解析することによって,根深ネギの葉鞘構造を確認することが可能であった.<br>

著者

Takayuki Sakamoto Motoyasu Ochi Yutaka Kikuchi Kyo Kobayashi Toru Tanaka Yukio Ozaki

出版者

一般社団法人 園芸学会

雑誌

The Horticulture Journal (ISSN:21890102)

巻号頁・発行日

pp.MI-081, (Released:2016-05-12)

被引用文献数

2

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Harvesting of asparagus spears is hard work because farmers have to harvest spears in a crouching posture. We previously developed electric long-shafted shears and a large-wheeled cart to improve the harvest posture, and we reported that the visibility of spears can be improved by modified branch training using string, without any yield or quality reduction. In the present study, we investigated the harvest efficiency, harvest posture, and subjective burden with electric long-shafted shears and a large-wheeled cart under modified branch training methods (the new standing harvest method) for labor-saving asparagus spear harvesting. Two male subjects in their 30s and 60s harvested spears for 60 min using (standing harvest) and without using (control) the new standing harvest method. The harvest efficiency of the new standing harvest method was 18% lower than that of the control. In the standing harvest, subjects had to pull the shears up to take the harvested spear from the shears with their left hand after each spear was cut (“take”). The subjects needed time for the “take” action, and the time necessary to harvest a spear with the electric long-shafted shears was longer than that required for the control. We also evaluated the harvest posture using the Ovako Working Posture Analyzing System (OWAS). For the subject in his 30s, action category(AC)2 and AC3 accounted for 72% and 14% of the postures recorded in the control, respectively, whereas in the standing harvest, AC1 and AC2 accounted for 57% and 41%, respectively. For the subject in his 60s, AC2 and AC3 accounted for 41% and 58% of the postures recorded in the control, respectively, whereas in the standing harvest, AC1 and AC2 accounted for 27% and 70%, respectively. Unfavorable postures during harvest were reduced by the new standing harvest method. The subjective physical burden on the subjects was evaluated using a modified Borg scale after 60 min of harvesting using and without using the new standing harvest method. The subjective physical burden in both subjects was highest (> 8) at the waist in the control, whereas the scores were lower than 3 in the standing harvest. Thus, the new standing harvest method reduced harvest efficiency, but resulted in substantial improvements in posture and reduced the physical burden on the subjects.

著者

執行 正義

出版者

一般社団法人 園芸学会

雑誌

園芸学研究 (ISSN:13472658)

巻号頁・発行日

vol.1, no.1, pp.75-80, 2002 (Released:2007-11-30)

参考文献数

30

著者

林田 大志 名田 和義 平塚 伸

出版者

一般社団法人 園芸学会

雑誌

園芸学研究 (ISSN:13472658)

巻号頁・発行日

vol.14, no.4, pp.357-363, 2015 (Released:2015-12-31)

参考文献数

19

被引用文献数

1 1

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数種の重金属は‘幸水’の単為結果を誘起し,着果率も20~30%であることから,摘果作業時間を大幅に短縮できる可能性がある.本研究では,開花前の‘幸水’花蕾に銅イオンを含むボルドー液と硫酸鉄(FeSO4)処理を行い,長果枝と短果枝における着果誘起効果の違い,果実へのGA処理による肥大促進効果ならびにそれら果実を果そうに複数着果させた場合の果実肥大を明らかにするとともに規模を拡大した実証試験を行った.ボルドー液による着果誘起は短果枝と長果枝で同様に生じ,また,得られた幼果にGAペースト処理する(ボルドー + GA)と十分に可販果となりうること,収量確保のために1果そうに2果以上を着果させることは不適切であることを明らかにした.次に,‘幸水’樹を網室で覆い,ボルドー + GAおよびFeSO4 + GA区で得られた果重分布,収穫時期の分布,収量について2年間にわたって調査した.その結果,果実サイズと収量は他家受粉区(マルハナバチ放飼による受粉)とほぼ同程度であり,加えて収穫期が大幅に早まることが明らかとなった.また,受粉・摘果関連作業時間は,慣行栽培と比較して大幅に短縮されることが示された.

著者

Daiki Matsumoto Ryutaro Tao

出版者

一般社団法人 園芸学会

雑誌

The Horticulture Journal (ISSN:21890102)

巻号頁・発行日

pp.MI-IR06, (Released:2016-04-27)

被引用文献数

2 43

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Prunus fruit tree species exhibit S-ribonuclease (S-RNase)-based gametophytic self-incompatibility (GSI). This system is also present in the families Plantaginaceae and Solanaceae and the tribe Maleae of the family Rosaceae. In S-RNase-based GSI, self/nonself-recognition between the pistil and pollen is controlled by the pistil S determinant S-ribonuclease gene (S-RNase) and the pollen S determinant F-box gene(s). Accumulated evidence indicates the Prunus pollen S locus contains a single F-box gene, while that of other plants consists of multiple F-box genes. The pollen S F-box genes are called S haplotype-specific F-box (SFB), S-locus F-box brothers (SFBB), and S-locus F-box (SLF) in Prunus, Maleae, and Solanaceae species, respectively. The consequences of pollen S gene mutations and heterodiallelic pollen production differ between Prunus species and other plants, suggesting there are different pollen S functions during self/nonself-recognition. The GSI systems of Prunus and other plants are believed to include the ubiquitin proteasome system for protein degradation. However, Prunus SFB is assumed to facilitate the S-RNase cytotoxic effects during self-recognition, while SLFs and SFBBs are thought to function collaboratively during nonself-recognition to avoid S-RNase cytotoxicity. This review summarizes the distinct features of the S-RNase-based GSI mechanism in Prunus species, with special references to the recent advances in our understanding of S-RNase-based GSI.

著者

Chunfen Zhang Sota Sato Tatsuro Tsukuni Mamoru Sato Hatsuhiko Okada Toshiya Yamamoto Masato Wada Shogo Matsumoto Nobuyuki Yoshikawa Naozumi Mimida Kaori Takagishi Manabu Watanabe Qiufen Cao Sadao Komori

出版者

一般社団法人 園芸学会

雑誌

The Horticulture Journal (ISSN:21890102)

巻号頁・発行日

pp.MI-094, (Released:2016-04-26)

被引用文献数

3

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To select cultivars to produce doubled haploids (DHs) efficiently in an anther culture, a total of 28 apple cultivars (25 cultivars and 3 rootstock cultivars) were investigated to assess their callus formation rate, embryo formation rate, shoot formation rate from embryo and efficiency of shoot multiplication and acclimatization. The callus formation rates of ‘Red Astrachan’, ‘Kinsei’, ‘Tsugaru’, ‘Golden Delicious’ (‘GD’), ‘American Summer Pearmain’ (‘ASP’), ‘Gala’, ‘Rome Beauty’, and ‘Jonathan’ were high, but ‘JM2’ and ‘King of Tompkins’ formed no callus. Regarding the embryo formation rates, ‘ASP’, ‘Rome Beauty’, ‘M.9’, and ‘Starking Delicious’ (‘SD’) were high, but ‘GD’, ‘JM2’, ‘King of Tompkins’, ‘Ralls Janet’, and ‘Smith’s Cider’ formed no embryo. Regarding the shoot formation rate from embryos, ‘Senshu’, ‘Tsugaru’, and ‘Sansa’ showed high values, but ‘Fuji’, ‘Jonathan’, and ‘Wijcik’ did not form shoots at all. The rate of shoot formation from anthers showed a high–low order of ‘Senshu’, ‘SD’, ‘ASP’, and ‘Tsugaru’. Multiplication and acclimatization of the shoots were not easy. Many individuals died. Eventually, only ‘Senshu’ and ‘SD’ acclimatized. Therefore, cultivars that produced DHs efficiently were ‘Senshu’ and ‘SD’. The results indicated that all processes of “embryo formation”, “shoot induction”, and “shoot multiplication and acclimatization” are important for obtaining DHs in apple anther cultures.

著者

執行 みさと 竹馬 昂平 國武 久登 小松 春喜

出版者

一般社団法人 園芸学会

雑誌

園芸学研究 (ISSN:13472658)

巻号頁・発行日

vol.12, no.4, pp.335-342, 2013 (Released:2013-12-27)

参考文献数

36

被引用文献数

1 2

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キイチゴ(Rubus spp.)は,果実中に含有されるフェノール化合物が健康維持に効果的と考えられることから注目されつつある果樹である.我が国にも多くの野生種が自生しているが,栽培されている品種のほとんどは欧米で改良されたものである.本研究では,野生種を園芸的に利用するための基礎的な知見を得るため,九州地方に自生するいくつかの野生種を収集し,育種素材としての評価を行った.栽培種はいずれも二倍体であったが,野生種はゲノムサイズの異なる二倍体と少数の六倍体であった.シマバライチゴを除く野生種の集合果は,栽培種と比較して小さくなかった.野生種の中にはクマイチゴ,カジイチゴおよびナガバモミジイチゴのように栽培種に比べ果実中の糖含量が高く,有機酸含量が低いものがあった.また,クマイチゴ,ナガバモミジイチゴおよびシマバライチゴは栽培種に比べ果実中の総ポリフェノール含量あるいは抗酸化活性が高かった.我が国自生の野生種のいくつかは,栽培し易く,果実品質が優れかつ機能性の高い品種を育成するための育種素材となり得るものと思われた.

著者

斎藤 岳士 福田 直也 西村 繁夫

出版者

一般社団法人 園芸学会

雑誌

園芸学研究 (ISSN:13472658)

巻号頁・発行日

vol.5, no.4, pp.415-419, 2006 (Released:2006-12-27)

参考文献数

20

被引用文献数

2 9

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NFTにおける2段摘心トマト栽培において,塩ストレス処理時期,栽植密度および果房直下の側枝利用を総合的に組み合わせた実験を行い,収量ならびに品質に及ぼす影響について評価した.塩ストレス処理は,開花期から行なうと,果実糖度は増加するものの平均果実重量が40%程度減少した.一方,第1花房開花20日後の果実肥大中後期から行うことにより,果実糖度は9.0前後に増加するが,果実肥大抑制は30%程度に抑えられた.高栽植密度条件下(約950株・a−1)では,低栽植密度(約670株・a−1)と比較して,果実品質に大きな影響を及ぼさずに果実収量が34%増加した.果房直下の側枝利用によって,塩ストレス処理下においても,栽植密度にかかわらず糖度を向上させる効果があることが示された.以上の結果から,NFTにおける2段摘心トマトでこれらの栽培技術を総合的に組み合わせることが高糖度トマト生産に有効であることが示された.

著者

細川 卓也 小松 秀雄 前田 幸二 中村 和洋 吉田 徹志 福元 康文

出版者

一般社団法人 園芸学会

雑誌

園芸学研究 (ISSN:13472658)

巻号頁・発行日

vol.5, no.1, pp.39-44, 2006 (Released:2006-04-11)

参考文献数

15

被引用文献数

4 6

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有機質成型培地を用いたトマトの長段どり栽培での高糖度果実の多収生産を目的とし,有機質成型培地の水分保持特性を調査し,日射比例給液制御装置を試作してこれを用いた場合の給液量の違いが収量・品質に及ぼす影響を検討した.スギ樹皮やヤシガラとバーク堆肥の混合資材からなる有機質成型培地ではロックウールスラブに比べて排水性が優れ,高pFでの水分率が高い水分保持特性を示した.長段どり栽培では,長期間にわたって葉面積の変動が小さく,積算日射と蒸発散量の間には高い正の相関関係が認められた.ヤシガラ・バーク培地を用い積算日射で1.71 MJ・m−2,1.93 MJ・m−2,2.13 MJ・m−2(第2果房下の葉を除去するまではそれぞれ1.50 MJ・m−2,1.71 MJ・m−2,1.93 MJ・m−2)ごとに100 ml・株−1を給液する3区を設けて収量・品質を比較した結果,可販果収量は給液量の多い区ほど多く,平均糖度は給液量の少ない区ほど高かった.高糖度果実(Brix 8%以上)の収量は,1.93 MJ・m−2(第2果房下の葉を除去するまで1.71 MJ・m−2)ごとに給液する区で最も多かった.

著者

Tomoya Niki Katsutomo Sasaki Masahito Shikata Takako Kawasaki-Narumi Norihiro Ohtsubo Takaaki Nishijima

出版者

一般社団法人 園芸学会

雑誌

The Horticulture Journal (ISSN:21890102)

巻号頁・発行日

pp.MI-129, (Released:2016-03-08)

被引用文献数

5

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We isolated a torenia mutant “Begonia” from selfed progeny of the mutable line “Flecked,” in which the ventral petal of the flower was converted into dorsal petal. In normal-type (NT) flowers, dorsal petals were pale violet and limbs of lateral and ventral petals were violet, whereas the ventral petal had a yellow nectar guide. In contrast, the ventral petal of mutant-type (MT) flowers changed to pale violet, and the nectar guide disappeared. These altered pigmentation patterns were observed from the early stage of corolla pigmentation. Expression analyses of the floral symmetry genes CYCLOIDEA (CYC), RADIALIS (RAD), and DIVARICATA (DIV) showed that TfCYC1, TfCYC2, TfCYC3, and TfRAD1 were mainly expressed in dorsal petals of NT flowers, but in the mutant, these genes were expressed in the ventral petal similar to dorsal ones. These results suggest that conversion of ventral to dorsal petal in the “Begonia” mutant is caused by high expression of TfCYC1, TfCYC2, TfCYC3, and TfRAD1 in the ventral petal, comparable to their expression in dorsal petals.

著者

Keita Sugiyama Daisuke Kami Takato Muro Takashi Otani Nobuyasu Seike Sayuri Namiki

出版者

一般社団法人 園芸学会

雑誌

The Horticulture Journal (ISSN:21890102)

巻号頁・発行日

pp.MI-097, (Released:2016-03-01)

被引用文献数

1

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We aimed to characterize the inheritance of HEPX (heptachlor exo-epoxide) uptake ability in summer squash (Cucurbita pepo L.). Crosses between ‘Patty Green’, a cultivar that cannot take up HEPX, and ‘Toyohira 2’, a cultivar that can take up high levels of HEPX, were evaluated in this study. The pattern of inheritance for F1 progeny indicated partial dominance since the measured amount of accumulated HEPX was close to that in ‘Toyohira 2’. In the F2 generation, plants segregated into those that did not take up HEPX and those that did take up HEPX at approximately a ratio of 1:5. This segregation pattern was similar to that for the inhibiting gene (dominant suppression of a dominant allele) in the dihybrid; the expected segregation ratio of 3:13 was supported by a chi-square test. Indeed, the I gene suppresses the N gene (non-transporting gene), but the i gene cannot suppress N (II or Ii suppression of NN or Nn). In this case, the genotype of ‘Patty Green’ is proposed to be iiNN and that of ‘Toyohira 2’ to be IInn. Additionally, we proposed three gene models to explain quantitative variation in HEPX transport. The genotypes of ‘Patty Green’ and ‘Toyohira 2’ are presumed to be ABC and abc, respectively. HEPX cannot be taken up unless two or more different dominant genes are present in a plant. Thus, the genotypes can be divided into HEPX non-transporting (Abc:aBc:abC:abc) and HEPX transporting (ABC:ABc:AbC:aBC) classes. Two or three different dominant genes, irrespective of the gene combination, work together to take up HEPX. In this model, the expected segregation ratio of 10 HEPX non-transporting:54 HEPX transporting was supported by a chi-square test. This pattern of inheritance was also supported by the segregation ratio of self-propagated plants (BC1-s) derived from a backcross. Although both of these inheritance models were correct phenotypically, the function of these genes should be clarified to explain the quantitative differences in HEPX uptake.

著者

Tsuyoshi Habu Hisayo Yamane Ippei Naito Soichiro Nishiyama Ayumi Nonaka Takashi Kawai Hisashi Yamada Ryutaro Tao

出版者

一般社団法人 園芸学会

雑誌

The Horticulture Journal (ISSN:21890102)

巻号頁・発行日

pp.MI-119, (Released:2016-02-09)

被引用文献数

8

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Japanese persimmon ‘Totsutanenashi’ (TTN) is a spontaneous small fruit mutant derived from ‘Hiratanenashi’ (HTN). To characterize the small fruit phenotype of TTN, we carried out a histological analysis, plant growth regulator treatments, and a transcriptome analysis using Illumina sequencing. The parenchymal cell number in TTN fruit was significantly less than in HTN fruit, and the parenchymal cell size in TTN fruit was also significantly smaller than that in HTN fruit at the later growing stage. However, the fruit size of TTN recovered by cytokinin treatments [50 or 200 ppm N-(2-chloro-4-pyridyl)-N′-phenylurea]. Thus, diminished cytokinin activity in TTN fruits may lead to less cell division in the early growing stage and less cell enlargement in the later growing stage. A large-scale transcriptome analysis was conducted using Illumina sequencing to determine the differences in gene expressions between TTN and HTN fruits. Illumina sequences were processed, resulting in 21,662,190 read pairs from HTN and 23,195,203 read pairs from TTN. After assembly of all sequences from HTN and TTN, 118,985 contigs (referred to as unigenes hereafter) ranging from 201 to 11,954 bases, with an average length of 915 bases, were obtained. Digital expression analyses revealed that the expression levels of 164 unigenes were significantly higher in HTN than in TTN, while the expression levels of 265 unigenes were significantly higher in TTN. A parametric analysis of gene set enrichment using the expression levels of unigenes showed that the biological process Gene Ontology categories of “cell cycle” and “regulation of cell cycle” were significantly down-regulated in TTN. The cell cycle-related differentially expressed genes included D3-type cyclin and Mitogen-Activated Protein Kinase Kinase Kinase. Based on the obtained results, the possible involvement of cell cycle-related genes in regulating the small fruit phenotype in TTN is discussed.

著者

Natsu Tanikawa Hiromichi Inoue Masayoshi Nakayama

出版者

一般社団法人 園芸学会

雑誌

The Horticulture Journal (ISSN:21890102)

巻号頁・発行日

pp.MI-114, (Released:2016-02-02)

被引用文献数

5

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Flowers of wild Camellia japonica L. are usually red, but infrequently the flowering trees of this species may have purple flowers. Such purple flowers are a highly desired horticultural property, but the color expression is not fixed. Even if a tree has splendid purple flowers in the spring, they may revert back to the red color of a wild C. japonica flower the next year. We investigated the factors responsible for the purple coloration using red, purplish-red, and purple flowers of the cultivar ‘Sennen-fujimurasaki’. The epidermal cells of purplish-red and purple petals were composed of both red and purple colored cells, whereas those of the red petals were uniformly red. Many of the purple cells contained blue-black granules. Cyanidin 3-glucoside and cyanidin 3-p-coumaroylglucoside, major pigments of red-flowered C. japonica, were the major anthocyanins of ‘Sennen-fujimurasaki’. The anthocyanin contents were not noticeably different among flowers of these different colors. Potential co-pigments such as flavones, flavonols, and cinnamic acid derivatives were negligibly detected. No significant differences were found in the Ca, Mg, Mn, Fe, Cu, and Zn ion contents or in the pH of petal homogenates; however, a significant difference was found in the Al ion content. The Al content of the purplish-red and the purple petals was 4–10 times higher and 14–21 times higher than that of red petals, respectively. A cyanidin 3-glucoside solution prepared at pH 4.8 was pale red with no precipitates. When Al ions were added to the cyanidin 3-glucoside solution, the solution became purple and produced blue-black precipitates similar to the blue-black granules observed in the purple colored cells. Differences in the spectral properties of the petals from those of the prepared solution could be caused by the co-occurrence of red and purple cells and may be influenced by other Al-chelating compounds and/or substantial Al concentrations in the vacuoles. We conclude that the purple flower color of ‘Sennen-fujimurasaki’ is generated by chelation of Al ions by anthocyanins. In other purple-flowered C. japonica exhibiting unstable flower coloration similar to that of ‘Sennen-fujimurasaki’, Al-anthocyanin chelation is also likely associated with the purple flower color.

著者

Ryo Norikoshi Katsunori Kohata Hiroko Shimizu-Yumoto Rie Goto Kazuo Ichimura

出版者

一般社団法人 園芸学会

雑誌

The Horticulture Journal (ISSN:21890102)

巻号頁・発行日

pp.MI-103, (Released:2016-01-13)

被引用文献数

10

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Petal growth associated with flower opening is due to cell expansion. To elucidate the role of soluble carbohydrates in expansion of petal cells in Eustoma grandiflorum, its soluble carbohydrates were identified, and changes in their subcellular concentrations during flower opening were investigated. In addition to glucose, fructose, sucrose, and myo-inositol, d-bornesitol was identified using 1H-NMR. d-Bornesitol was the major soluble carbohydrate in leaves and stems. Given that cyclitols are known to be the translocated carbohydrates in alfalfa, phloem exudate was analyzed. However, the translocated carbohydrate was suggested to be sucrose, and not d-bornesitol. In the petals, glucose and sucrose content increased whereas d-bornesitol and myo-inositol contents were almost constant during flower opening. The fructose content in petals was very low. Glucose, sucrose, myo-inositol, and d-bornesitol were found mainly in the vacuole, although sucrose was also found in the cytoplasm. In the petals of open flowers, glucose and sucrose concentrations in the vacuole increased to 60 and 53 mM. Inorganic ion concentrations in the symplast and apoplast did not increase during flower opening. The osmotic potential of the symplast and apoplast in the petals was lower at the open stage than the potential of those at the bud stage, and this difference was mainly attributed to increases in glucose and sucrose concentrations. The results suggest that the accumulation of glucose and sucrose in the vacuole reduces the symplastic osmotic potential, which appears to be involved in the cell expansion associated with flower opening, but that the contribution of d-bornesitol as an osmoticum to cell expansion is limited in Eustoma.

著者

Hiroshi Yakushiji Atsu Yamasaki Shozo Kobayashi Junko Kaneyoshi Akifumi Azuma Hiroyoshi Sugiura Akihiko Sato

出版者

一般社団法人 園芸学会

雑誌

The Horticulture Journal (ISSN:21890102)

巻号頁・発行日

pp.MI-080, (Released:2015-12-29)

被引用文献数

4

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‘Hasshu’, a dwarf budsport that originated from the leading persimmon cultivar ‘Hiratanenashi’ (Diospyros kaki Thunb.), was discovered in Japan in 2005. Although ‘Hiratanenashi’ is seedless because of anisoploidy (2n = 135 = 9x), ‘Hasshu’ produces some small normal seeds. In this study, we investigated differences in the morphological characteristics of the vegetative organs and fruits and in the ploidy level between ‘Hasshu’ and ‘Hiratanenashi’. The shoot length, internode length, and leaf size of ‘Hasshu’ were smaller than those of ‘Hiratanenashi’. ‘Hasshu’ bore smaller flowers than those of ‘Hiratanenashi’ in late May, and had consistently smaller fruit than ‘Hiratanenashi’ at all fruit development stages. ‘Hasshu’ ripened in late October, similar to ‘Hiratanenashi’. Both ‘Hiratanenashi’ and ‘Hasshu’ are pollination-variant astringent (PVA) cultivars. Except for the deletion of one allele at ssrdk10, no differences were detected between the two cultivars at four simple sequence repeat (SSR) marker loci. By flow cytometric analysis and chromosome observation, we confirmed that ‘Hasshu’ was octoploid (2n = 120 = 8x), indicating that it was both a dwarf and a ploidy-reduction mutation. These results suggest that recovery of the ability to produce some normal seeds by ‘Hasshu’ may have been caused by the change in ploidy from anisoploid to isoploid.

著者

Taishi Hayashida Kazuyoshi Nada Shin Hiratsuka

出版者

一般社団法人 園芸学会

雑誌

The Horticulture Journal (ISSN:21890102)

巻号頁・発行日

pp.MI-067, (Released:2015-12-19)

被引用文献数

1

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Since both artificial pollination and fruit thinning are necessary for marketable fruit production of Japanese pears (Pyrus pyrifolia (burm. f.) Nakai) in Japan, about a 20% fruit set is ideal without pollination because only 5% of flowers are actually subjected to fruit production. In this study, copper (Cu2+) and ferrous (Fe2+) ions were shown to be effective for inducing a nearly-ideal fruit set of the Japanese pear ‘Kosui’. Fruit induced by ferrous sulfate (FeSO4) solution or a Bordeaux mixture, which is a combination of copper sulfate (CuSO4), lime, and water, were parthenocarpic, because 1) self-pollen tube growth was not promoted by Cu2+ and Fe2+, 2) almost no perfect seeds were observed at harvest, and 3) Cu2+ and Fe2+ acted as strong inhibitors of pollen tube growth in vitro. The effective stage for inducing parthenocarpy was sprouting time to 4 days after anthesis in the Bordeaux mixture, and sprouting time to 4 days before anthesis in the FeSO4 solution. Annual changes in the effectiveness were found in both chemicals, and the Bordeaux mixture showed no inhibitory effect on the fruit set of cross-pollinated flowers. The growth of Bordeaux mixture-induced fruit was improved by gibberellin (GA) paste or GA paste mixed with N-(N-(2-chloro-4-pyridy1)-N'-phenylurea (CPPU) treatment of the fruit stalk; the treated fruit was about 100 g heavier than the untreated fruit. The GA paste treatment is currently conducted to promote fruit growth and maturation in ‘Kosui’ fruit production in Japan, and the Bordeaux mixture can be substituted for chemical fungicide generally used before anthesis to control scab and black spot disease. Accordingly, the Bordeaux mixture is a promising chemical for great labor-saving in ‘Kosui’ cultivation.

著者

Akiko Ito Daisuke Sakamoto Akihiro Itai Takaaki Nishijima Naomi Oyama-Okubo Yuri Nakamura Takaya Moriguchi Ikuko Nakajima

出版者

一般社団法人 園芸学会

雑誌

The Horticulture Journal (ISSN:21890102)

巻号頁・発行日

pp.MI-107, (Released:2015-12-17)

被引用文献数

10

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In order to promote increases in the size of ‘Kosui’ Japanese pear [Pyrus pyrifolia (Burm.) Nakai] fruit by plant growth regulators, we applied gibberellin (GA)3+4 paste [2.7% (w/w), A3:A4 = 90:10] in combination with prohexadione-calcium [1%, PCa; BAS-125 (3-oxido-4-propionyl-5-oxo-3-cyclohexene-carboxylate)], an inhibitor of GA 2β-hydroxylation that catabolizes active GA into an inactive form, to fruit pedicels at approximately 30 days after full bloom. GA3+4+PCa treatment advanced fruit growth only in the early stages, but fruit weight did not show any significant differences between the untreated control and GA3+4+PCa-treated fruits at harvest. In contrast, when GA4+7 [2.7% (w/w), A4:A7 = 66:34] was applied, the fruit weight at harvest was greater than that of untreated fruit. Moreover, GA4+7 treatment in combination with PCa resulted in an even higher fruit weight at harvest. The GA4 concentration in fruit flesh was not affected by GA3+4 application at 1 week after the treatment (WAT) either with or without PCa, but GA4 levels increased with GA4+7+PCa treatment, resulting in a significant increase in fruit weight at harvest. A single GA4+7 application almost doubled the GA4 concentration compared with the untreated control, but the difference was not significant. These results indicate that fruit weight at harvest was greater when the GA4 concentration was higher in the fruit flesh at 1 WAT. The higher concentration of GA4 in the GA4+7+PCa-treated fruit compared with the GA4+7 treatment alone may be attributed to the function of PCa that acts to prevent the inactivation of GA4 to GA34 by inhibiting 2β-hydroxylation.

著者

Yoshio Mori Katsuhiko Sumitomo Tamotsu Hisamatsu Tanjuro Goto

出版者

一般社団法人 園芸学会

雑誌

The Horticulture Journal (ISSN:21890102)

巻号頁・発行日

pp.MI-072, (Released:2015-12-16)

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Summer-to-autumn-flowering small-flowered spray-type (SAFS) chrysanthemums (Chrysanthemum morifolium Ramat.) are commercially important in Japan, and there is an occasional increased demand for these flowers. However, under current cultivation methods, the quality of spray formations is compromised in order to maintain a sufficient production rate at times of peak demand. This study investigated the effect of interrupted lighting (IL), the intercalation of a period of long days (by night interruption) into the natural day length (NDL) period of growing, in order to regulate spray formations in SAFS chrysanthemum cultivars ‘Haruka’ and ‘Subaru’, in which lighting can markedly delay flowering. The effects of the NDL period before IL and those of the IL period were investigated. First, we investigated the effect of 2–12 days of NDL followed by 12 days of IL. Plants subjected to 2–6 days of NDL had longer flower clusters and a greater number of flower buds on the upper lateral flower stems and developed a broom-like spray. Next, we investigated the effect of 4–20 days of IL after 4 days of NDL. Plants subjected to 8–20 days of IL had longer flower clusters, more flower buds on the upper lateral flower stems, and broom-like sprays. These changes were more pronounced when the IL periods were prolonged. Our results showed that spray formation in SAFS chrysanthemum cultivars ‘Haruka’ and ‘Subaru’ can be regulated by controlling the timing and period of IL.

著者

Koji Tanase Takashi Onozaki

出版者

一般社団法人 園芸学会

雑誌

The Horticulture Journal (ISSN:21890102)

巻号頁・発行日

pp.MI-093, (Released:2015-12-11)

被引用文献数

6

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We investigated differences in flower longevity, ethylene production, and ethylene sensitivity among pot carnation cultivars by quantitative PCR analysis. The flower life of ‘Polaris’ was significantly longer than that of ‘Ariel’ (control cultivar), ‘Orange Duo’, and ‘Lemon Soft’. The flowers of ‘Polaris’ produced little ethylene, and had low expression of the ethylene biosynthesis genes DcACS1 and DcACO1. The transcript levels of senescence-related (SR) genes DcCP1, DcbGal, and DcGST1 increased in petals of ‘Ariel’, ‘Orange Duo’, and ‘Lemon Soft’ at senescence, but were very low in ‘Polaris’. These results suggest that the low ethylene production in ‘Polaris’ is caused by low expression of DcACS1 and DcACO1, as in long-life flowers of the cut carnation cultivars ‘Miracle Rouge’ and ‘Miracle Symphony’. The ethylene sensitivity of ‘Orange Duo’ and ‘Lemon Soft’ was lower than that of both ‘Ariel’ and ‘Polaris’. Petals of ‘Orange Duo’ and ‘Lemon Soft’ wilted, and inrolled more slowly than those of ‘Ariel’ and ‘Polaris’, despite the upregulation of ethylene biosynthesis genes (DcACS1 and DcACO1), DcCP1, DcbGal, DcGST1, and DcEIL3 in petals of all cultivars upon application of exogenous ethylene. These results imply that only the components related to the inrolling of petals are altered in these ethylene-insensitive cultivars.

著者

Hyun Jin Kim Sun Hee Choi Yoon Jin Kim

出版者

一般社団法人 園芸学会

雑誌

The Horticulture Journal (ISSN:21890102)

巻号頁・発行日

pp.MI-104, (Released:2015-12-10)

被引用文献数

5

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The aims of this study were to examine the effects of different temperatures on seed germination and initial long-day (LD) or short-day (SD) duration on growth, floral initiation, and development of Hosta yingeri S.B.Jones. The germination percentage of H. yingeri seeds was > 90% at 5°C and between 15°C–30°C. The lowest time to the first germination (TFG) and the mean germination time (MGT) were observed at around 30°C. The optimum temperature for germination can be around 30°C considering the final germination percentage, TFG, and MGT together. Plant height, number of leaves, and leaf length increased as the initial SD duration decreased. The percentages of plant bearing buds were 50%, 50%, 20%, 10%, and 0% when the initial SD treatments were 0, 3, 6, 9, and 12 weeks with 29, 26, 23, 20, and 17 weeks of LDs, respectively. No plants flowered when they were exposed to the initial LD conditions. Flower spike length, number of visible buds, and number of open flowers increased as the duration of the initial SD decreased. Four-week-old H. yingeri required ≥ 26 weeks of LD duration to achieve >50% flowering.