遺伝子の形質発現と環境との関係に関する研究 : 1.水稲E_1およびE_2遺伝子の日長に対する反応

概要

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1. Experiments were conducted as a part of the series of fundamental researches on the relationship between day-length and the action of genes E_1 and E_2 controlling heading date with the aim of obtaining some information on rice breeding. 2. Strains which possess E_1 and E_2 m different ,combinations homozygously (Table 1) were maintained under various photoperiodical treatments (Fig. 1), and the variation in heading date and ear primodium differentiation were observed. 3. The findings are as follows : The genes E_1 and E_2 have little effect on the period necessary for acquiring short-day sensitivity (35-40 days after sowmg m all the stralns) (Fig. 2 and Table 2). The effect of genes E1 and E2 on heading date is closely related to the length of photoperiods(Fig. 3). Under the common environment of rice culture where the photoperiod decreases gradually, the time of ear primordium [differentiation is determined mainly by the genotypically specific "criticalday-length" (Fig. 4). The effect of gene Ei on the critical-day-length is larger than that of gene E_2. The critical-day-length seems to become longer as the plant becomes older (Fig.5). 4. These findings may be important in understanding the relation between genetic and environmental effects on character development.
日本育種学会の論文
1958-10-05