水稻 量的形質의 遺傳에 관한 硏究 Ⅷ. 벼種字의 低溫發芽性 遺傳

Studies on the inheritance of quantitative characters in rice Ⅷ. Analysis on the low temperature germination in diallel cross of F₂generation

This experiment was carried out to obtain the basic data of inheritance for the low temperature germination which will be applied to the breeding programs of cold tolerance by using 7 low temperature germination varieties. They were crossed by diallel and checked for low temperature germination percentage and combining ability. The general combining ability(GCA) and specific combining ability(SCA) for low temperature germination by 7-parent diallel analysis showed highly significant respectively and GCA was higher than SCA. In case of GCA analysis, Seolagbyeo, IR20654-15-1 and Mjilyang 23 showed positive effect for the low temperature germination, but Hangangchalbyeo, Taebaegbyeo, Cheongcheongyeo, and Seonambyeo showed negative effect. There was no regular tendency for SCA, but the crosses which had Taebaegbyeo as female parent showed positive effect to low temperature germination in case of SCA studies. The varieties which had relatively good germination under 12℃ air temperature were Seolagbyeo IR20654-RRR-15-123 in order, but poor germination varieties were Cheongcheongbyeo and Seonambyeo. Almost all of the cross showed continuous variation for the distributions of germination grains at low temperature in F₂ generation by days after sowing and the crosses which had Milyang 23 or Seoalgbyeo as parentage showed transgressive segregation toward good germination percentage.