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Effects of nuclear and cytoplasmic factors on seed quality of hybrid wheat with T. timopheevi cytoplasm

LIU Zhong qi RAO Shi da PU Zong jun (Sichuan Academy of Agri.Sci.,Chengdu 610066,China)  
A-lines and R-lines with T.timopheevi cytoplasm as well as B-lines with T.aestivum cytoplasm were used to study the effects of nuclear and cytoplasmic factors on seed quality of hybrid wheats from 1993 to 1996.Experimental results showed that grain weight and seed sprouting rate(SSR) of most A-lines only took 90% and 50% of corresponding B-lines,respectively.Great deviation in years were seen in these two traits. Variation coefficients of seed sprouting rate in some A-lines were as high as 23.7%.Only a few A-lines showed similar seed quality to their B-line as well as good stability.However, there were significant differences among A-lines in grain shrivelling index and seed sprouting potential.For hybrid seeds produced from A-lines and R-lines,their grain weight was mainly determined by A-lines,but seed sprouting rate was controlled by both parents.When SSR of A-lines was above 70%,the SSR of hybrid wheat was positively and significantly correlated with the SSR product of two parents,r=0.850  .Inter-crossing experiments indicated that Rf genes could efficiently eliminate the deleterious effects of T-type cytoplasm on seed quality.Some sparse non restoration genes in bread wheat can also compensate the unfavourable effects of T-type on grain development.Their inheritance needs further investigation.
【Fund】: 四川省应用基础项目
【CateGory Index】: S512.103.2
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