胡麻の品種に関する研究 : (2)感光性程度による胡麻品種の分類について
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The classification of sesame varieties is generally made in several ways, namely, the color of the seed, the duration of the growth, the sowing season and the type of branching. Nevertheless it is rather hard to define the varieties exactly, because they differ according to changes of conditions for cultivation. In this paper, the classification of sesame varieties viewed from the standpoint of their light sensitivity will bes discussed. (1) The material used in the experiments were 30 in number taken out of eight countries, inincluding Japan. Three varieties of them were brought from the producing country through U.S.A. They were sown on June 30,1955. Then treatment was exercised from July 10 and continued through August 10,and after treatment their growth was put to their natural conditions. The treatment was as follows : (2) Check plot : (N) Cultivation under natural conditions. Short-day treatment : (S) Exposure of eight hours per day (9A.M.-5P.M). Long-day treatment : (L) In the day time, by natural exposure, at night illuminated all night with two bulbs of 100 w. from the distance of 1.5 M. (N), (S) and (L) are days required from seedling to flowering. (3) As to the percentage of comparison of light sensitivity, the following formulas are proposed : a) Promoted flowering percentage by Short-day =(N-S)/N×100 b) Promoted flowering percentage by Long-day =(N-L)/N×100 c) Delayed flowering percentage by Long-day =(L-N)/N×100 d) Percentage of light sensitivity =(L-S)/N×100 (4) By the results of the experiment the varieties were classified into the following 5 groups : 1) A group being highly sensitive to both Short-day and Long-day conditions. 2) A group being more sensitive to Short-day, while low to Long-day conditions. 3) A group being less sensitive to Short-day, but more to Long-day conditions. 4) A group being highly sensitive to Long-day conditions. (5) This district is in the latitude of 30°40' North. The sowing season is from the beginning of May to the end of June. The percentage of light sensitivity of sesame under natural conditions increases by Long-day than Short-day, according the early, middle and late maturing varieties. (6) With regard to the temperature sensitivity, which has a close relationship with light sensitivity, further research is required.
- 日本生態学会の論文
- 1956-12-31
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