Responses of Heading-conferring Lm Alleles of Rice to Seasonal Changes of Natural Daylength
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概要
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Lm alleles that belong to the linkage group I control the photoperiod sensitivity of cultivated rice. The heading responses of Lm alleles to the seasonal change of natural daylength were analyzed. Two isogenic lines with Lme and Lmu alleles were grown through the year in the greenhouse in the Tohoku National Agricultural Experiment Station at 39°29' North Latitude and were examined for their heading time. Lmu/Lmu line headed 59 days after planting, 18 days earlier than Lme/Lme line when they were planted in late December. However, in the ordinary summer culture the earliness of the two lines was reversed with the later heading of Lmu/Lmu line being later than Lme/Lme line (Fig.2). The fall planting after August resulted in the earlier heading of Lmu/Lmu line again. The reverse order of the earliness between Lme/Lme and Lmu/Lmu lines occurred in March and July plantings.
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