麥類의 世代促進方法에 關한 硏究 Ⅲ. 秋播栽培와 夏季栽培에 따른 小脈 F₂ 雜種集團의 主要形質 比較

Studies on Procedures for Accelerating Generation Advancement in Wheat and Barley Breeding Ⅲ. Comparison of Main Characters in the F₂-Hybrid Populations of Wheat by Winter and Summer Cropping

In the experiment for studying the changes of genetic constitutions of main characteristics as using the two F₂-wheat hybrid populations under the quite different environmental conditions of Suweon winter cropping and Daekwanrung summer cropping, wider variations and amounts of variance of heading date showed under Daekwanrung summer cropping conditions than under Suweon winter cropping conditions. However, longer culm and more number of grains per spike, and wider range of variation of their characteristics were obtained under Suweon winter cropping conditions. These were high significances of F-test in variance of culm length and number of grains per spike between the two conditions. In the F₂-wheat cross of Chugoku 81/Chinkwang × Yecora F 70, calm length was correlated with heading date, spike length and number of grains per spike, and in another wheat cross of Chugoku 81 × Suweon 203, there were the positive siginificant correlations between the main characteristics except the relation of heading date and number of grains per spike.