杂交早稻米质性状遗传的初步研究

测定武昌夏季和广西秋季栽培的杂交早稻新组成威伐242F1、F2，汕优242F、F2，威20B，珍汕97B和湖大242的糙米率、精率、米粒长、米粒宽、粒形（长／宽）、垩白等级和碱消值。分析以上性状的F2变异，估算垩白等级和碱消值的广义遗传力分别为52．26％和80．40％。同时研究了异地不同季别栽培条件对米质性状的影响。

A PRIMARY GENETIC STUDY ON RICE GRAIN QUALITY CHARACTERS OF EARLY HYBRID RICE

Two new hybrid combinations of early rice Wei-You 242 F1 F2 and Shan-You 242 F1 F2,V20B,Zhen-Shan 97B and Hu-Da 242 were planted during summer in Wuchang and during autumn in Guangxi separately. The percentage of brown rice,milled rice recovery,length,width,shape (length/width) ,chalkness score and alkali spreading value of grains were measured. The F2 variation of the above characters was studied. The heritability (hb2) of chalkness score was estimated at 52. 25% and the hb2 of alkali spreading value was 80. 40%. Besides,the comprison of grain characters between summer-planted rice and autumn-planted rice demonstrated the effects of different planting conditions on rice grain Quality .