菜豆の生殖生理に関する研究(第5報) : 菜豆の播種期が莢長・胚珠数・1莢種子数等に及ぼす影響に就いて

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概要

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• The effects of seed-sowing dates on the pod characters of the dwarf variety Masterpiece were studied. The seeds were sowed ten times, namely on 15th and 30th in April, the same in May, 14 th and 29th in June, the same in July, and 13th .and 28th in August. The results were as follows: (1) The length of pod of the 15th-April-plot was the longest of all, and the later the sowing date, the shorter the length of pod until 14th-July-plot. The length of pod of the 14th-July-plot was 57% of that of the 15th-April-plot. After 14th-July sowing, the length of pod again became longer until that of the 28th-August-plot which was 75% of that of the 15th-April-plot. (2) The number of ovules per pod indicated the same tendency as the length of pod. (3) The tendency of the number of seeds per pod in relation to sowing dates was similar as above, but the minimum point became later and the degree of decrease was greater than those of above-mentioned. Those of the 29th-July-plot and 13th-August-plot were the least and were 29% of that of the 15th-April-plot. The number of seeds per pod of the 28th-August-plot increased a little and was 36% of that of the 15th-April-plot. (4) The weight of seeds per pod behaved similarly as the number of seeds per pod, but the degree of decrease was remarkable as the sowing date became later. That of the 29th-July-plot was the least of all and was only about 10% of that of the 15th-April-plot. (5) The number of pods per plant showed a little different tendency from the others. The plants of three sowing dates next to 15th-April had more pod than those of the first sowing date, 15th, April. But later than the 14th, June, the number of pods per plant decreased until the 29th-July-plot. Those of two sowing dates in August again increased. (6) The gross tendency that appeared through the above-mentioned terms seemed to be summarised that the bad effects became suddenly evident from the 14th-June-plot and the worst results were seen in the July-sowings and the effects recovered afterwards. It is assumed that high temperatures at the time of flower-bud differentiation and at the flowering period have bad effects on some pod characters and the set of pods resulting the decreased yields.

• 園芸学会の論文

著者

• 井上 頼数

  東京教育大農

• 渋谷 正夫

  東京教育大農学部

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