- 著者
- Ken Takahata
- 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-034, (Released:2017-01-07)
- 被引用文献数
- 1
The objective of this study was to determine whether planting pepino (Solanum muricatum Ait.) cuttings (shoots have 5 or 6 true leaves and length is 5–6 cm) through the hole (diameter is 4 mm) of a steel washer (hereinafter referred to as the “washer ring treatment”) would increase the soluble solids content of pepino fruit. Experiments were conducted twice: i.e. from spring to summer (Experiment 1) and from autumn to spring (Experiment 2). The washer ring treatment caused marked increases in stem diameter immediately above the washer compared to the control, but slightly suppressed stem elongation and leaf unfolding. The stem diameter above the washer at the end of culture was smaller in the treated plants compared to the control plants. The fresh weights of both above-ground and root tissues were also smaller in the treated plants compared with control plants. In contrast, no differences were observed between the treated and control plants in the number of flowers, the fruit set ratio, or the disorder fruits ratio. The marketable fruits harvested from treated plants were smaller compared to those from control plants by 28 to 47 g and 66 to 147 g in Experiments 1 and 2, respectively (i.e. reduction in yield); however, the fruits were denser and contained more soluble solids at 1.1 to 2.4°Brix and 1.1 to 2.9°Brix, respectively. This study confirmed that the washer ring treatment is effective for increasing the soluble solids content of pepino fruit.
- 著者
- Ken Takahata Hiroyuki Miura
- 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-110, (Released:2016-05-28)
- 被引用文献数
- 5
In the tomato (Solanum lycopersicum), the position of the inflorescence on the stem is known to affect the number of days to first anthesis and has commonly been characterized by the leaf-number (ordinal number from the oldest leaf) of the leaf just below the inflorescence (LEAF-BI) only by the appearance after extension of the stem near the inflorescence. Some examples showing that this evaluation was not suitable were observed by the authors. To confirm the reproducibility of the observation, experiments were conducted in which 4 cultivars were sown in a greenhouse 12 times from Oct. 2008 to Aug. 2010. Based on the vertical positional relationship between the base of the first, second, or third inflorescence and the base of the last initiated leaf before inflorescence primordium on the growing point (L-LEAF, the true guide for determining the inflorescence position), the L-LEAFs of ‘My Lock’ plants in all growth periods and ‘House Momotaro’, ‘Momotaro 8’, and ‘Super Fast’ plants in the non-high-temperature growth periods were always just above the inflorescences, that is, the LEAF-BIs were always the leaves below the L-LEAFs. In contrast, the L-LEAFs of all cultivars except ʻMy Lockʼ in the high-temperature growth periods were often just below the inflorescence, that is, the LEAF-BIs were often the L-LEAFs. Comparing the leaf-number of LEAF-BI and that of L-LEAF demonstrated that the former often overestimated the inflorescence positon among growth periods and cultivars. In temperature treatments with ‘House Momotaro’, such a positional switch of the L-LEAF was reproducible. External observation indicated that the stem on the L-LEAF side and the stem on the inflorescence side extended non-uniformly and the position of the L-LEAF was determined by which side extended faster. Collectively, the LEAF-BI is not a leaf identified morphogenetically, and to identify the position of the inflorescence, the leaf-number of L-LEAF, not LEAF-BI, should be used.