三个光温敏核不育系的不育性遗传分析

用6442S、8011S、1290S和5个父本配制12个组合，运用主基因+多基因混合遗传模型对P1、P2、F1、F2结实率性状进行世代联合分析，结果表明：12个组合的最适模型不相同，但都集中在B、D、E三模型，不育主基因在所有组合中都存在，只是主基因表达的对数及主基因和多基因的遗传效应有所差异。以1290S为母本的两个组合中，1290S/1990的遗传效应偏重于加性效应和显性效应，1290S/新露B偏重于上位性效应遗传，它们的遗传率均达94%以上；以6442S为母本的组合中，加性效应和显性效应比重都较高，但它们的基因遗传率变化幅度较大，达73.32%~99.17%，其中组合6442S/新露B和6442S/R402、6442S/1990存在多基因遗传，多基因遗传率最小为0.83%，最高达35.52%；以8011S为母本的组合中， 8011S/测64 7和8011S/1990的上位性遗传效应较强，其余以加性效应和显性效应遗传为主，有两个组合呈多基因遗传，为组合8011S/R402和8011S/1990，多基因遗传率分别为1.03%和5.94%，基因遗传率最高达99.06%之多，最小只有6757%(组合8011S/新露B)。

Genetic Analysis of Male Sterility in Three Photo-Thermo-Sensitive Genic Male Sterile Lines in Rice

Three photo-thermo-sensitive genic male sterile lines(6442S,8011S,1290S) were crossed with five male parent lines(1990,Xinlu B,Ce 64-7,JR2410,R402),and the sterility of the 12 crosses in four generations(P_1,P_2,F_1,F_2) was jointly analyzed with the mixed inheritance model developed by Gai.The fittest model of the 12 crosses differed,however,all of them showed B-model or D-model or E-model inheritance;The sterile gene existed in all the crosses but the expression of the gene was diverse in various environments.In the crosses which 1290S acted as the female parent,the genetic effect of cross 1290S/1990 was predominant on additive effect and dominant effect,whereas cross 1290S/Xinlu B on epistasis effect,and the heritabilities of the two crosses were over 94%.In the crosses which 6442S was used as the female parent,the proportions of the additive effect and dominant effect showed high value,with the heritabilities ranged from 73.3% to 99.2%,and there existed polygene heritability in the crosses 6442S/Xinlu B,6442S/R402 and 6442S/1990,with the least value of 0.83% and the highest one 35.5%.In the crosses which 8011S was used as the female parent,the epistasis effect was stronger in crosses 8011S/Ce 64-7 and 8011S/1990,but additive effect and dominant effect in other crosses,and 8011S/R402 and 8011S/1990 showed polygene heritability,with the values of 1.03% and 5.94%,respectively.Among the crosses with 8011S as the parent,the highest heritability was 99.06%(8011S/R402),and the lowest was 67.57% 8011S/Xinlu B.