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以H-347×虾夷正反交的未加选择的F_2～F_7群体以及对新2号×房吉和新2号×Sesia的F_2群体的粒重、腹白米率加以选择,根据选择反应和相关反应,推算遗传率和遗传相关系统数。供试的杂种群体的变异普遍为:糙米千粒重17～37g,腹白米率在0～100％之间。粒重的遗传率不论哪一世代和材料都在0.7左右,可见其非累加性遗传变量的比率小;腹白米率的遗传率从F_2→F_3选择的0.3左右渐增到F_4→F_5选择的0.7左右,表明其非累加性遗传变量大。两者的遗传相关系数大约在0.7左右,因为遗传相关系数不随世代而变化,所以可认为相关的原因不是基因的连锁。大粒性主效基因Lk-f多效性地支配着腹白米率。根据遗传率及遗传相关的大小,通过粒重而间接选择腹白米率有时也是有效的。
The unselected F_2 ~ F_7 populations of positive and negative cross between H-347 × Hibiscus makinoi and the F_2 population of Xin 2 × Fuji 2 × Sesia were selected according to the selection reaction and Related reactions, estimated heritability and number of genetically related systems. Variants of the tested hybrid populations are generally: brown rice weight of 17 ~ 37g, white belly rice rate between 0 ~ 100%. The genetic rate of grain weight no matter what the generation and the material are around 0.7, we can see that the rate of non-accumulative genetic variable is small; the heritability of the rate of white white rice is gradually increased from 0.3 of F_2 → F_3 selection to 0.7 of F_4 → F_5 selection Left and right, indicating a large non-cumulative genetic variables. The genetic correlation coefficient between the two about 0.7 or so, because the genetic correlation coefficient does not change with the generation, so that the relevant reason is not a genetic linkage. Large-grain major gene Lk-f dominated the rate of white rice more efficiently. Depending on the heritability and the genetically related size, it is sometimes effective to select the rate of abdominal whiteness indirectly by grain weight.