著者

Hyun Jin Kim Jongyun Kim Do Lee Yun Ki Sun Kim 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-133, (Released:2016-03-31)

被引用文献数

5

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To assess the growth and flowering of the Doritaenopsis orchid in alternative substrates, Doritaenopsis Queen Beer ‘Mantefon’ was grown for 15 months in four different substrates; a commercial 100% Chilean sphagnum moss (S), peat moss (P), medium-grade Douglas fir bark mixed with P with a 3:7 ratio (v/v) (BP), and S and P mixes (SP) with a 4:6 ratio (v/v). Physical (porosity and water holding capacity) and chemical (pH and EC) properties of the four substrates were investigated. SP substrate had significantly higher substrate volumetric water content (VWC) than the other three substrates only for the first 3 days after fertigation, and only the BP substrate maintained lower air space than the other substrates. Although there was no relevant growth responses to VWC and air space changes, a better growth in shoots and fastened flowering of Doritaenopsis ‘Mantefon’ occurred in plants grown in the P substrate, which could be attributed to providing better contact of terrestrial roots to the substrate enabling enough water and nutrient supply, along with a proper pH range of 6.15. At 15 months after transplanting, plants grown in the P and BP substrates had larger leaves and a greater shoot dry weight than the plants grown in the S and SP substrates. Plants grown in the P substrate produced 2.75 flower spikes, whereas the plants grown in the S, BP, and SP substrates produced 2.00 to 2.33 flower spikes. Plants grown in the P, BP, S, and SP substrates produced a third flower spike, being 67%, 33%, 17%, and 8%, respectively. There was no significant difference in the total number of flowers, while the total numbers of buds were 32.3, 23.4, 23.0, and 19.7 in plants grown in the P, S, BP, and SP substrates, respectively. Time to visible flower spike was shortened in plants grown in the P substrate compared to the plants grown in other substrates. With these results, using alternative substrates including peat moss for Doritaenopsis cultivation, growers may be able to promote leaf growth and flower spike induction with lower expenses on substrate costs, resulting in a high quality production of Doritaenopsis ‘Mantefon’ with more profit.

著者

Hyun Jin Kim Ah Ram Cho Kyoung Sub Park 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.OKD-027, (Released:2016-11-11)

被引用文献数

11

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To increase the photosynthesis of crop and improve plant quality, we evaluated the effect of elevated CO2 on vegetative growth and flowering in Phalaenopsis Fuller’s Pink Swallow. Plants were exposed to 450 (control), 800, 1600, and 2400 μmol·mol−1 CO2 for 31 weeks. The number of leaves, leaf length, and leaf width displayed greater increases in plants grown under 1600 and 2400 μmol·mol−1 CO2 than in plants grown under 450 and 800 μmol·mol−1 CO2. The times to leaf initiation were reduced to 90.7 and 85.8 days in plants grown under 1600 and 2400 μmol·mol−1 CO2, respectively, compared with that of the control, 177.1 days. The leaf elongation rate was significantly increased in plants grown under 1600 and 2400 μmol·mol−1 CO2 compared to plants grown under 450 and 800 μmol·mol−1 CO2. Plants grown under 1600 μmol·mol−1 CO2 had the highest total number of flower buds among all plants grown under the four tested CO2 concentrations. Leaf injuries were not observed in any plants regardless of CO2 concentration, but flower bud abortion and bud withering were observed in CO2-enriched plants, especially in plants grown under 1600 and 2400 μmol·mol−1 CO2. Plants subjected to long-term CO2 elevation of over 800 μmol·mol−1 displayed increased biomass production despite a concomitant reduction in the number of buds. These results showed that 1600 and 2400 μmol·mol−1 CO2 significantly enhanced the vegetative growth of Phalaenopsis. However, long-term exposure to high CO2 concentrations can adversely affect the flowering of Phalaenopsis, and result in reduced flower production and increased flower bud abortion.

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.