Abstract: The sterility of the spikelets results in the decrease of kernels per spike,and basal sterile spikelets number (BSSN) and top sterile spikelets number (TSSN) are its two components.Thus far,there was little knowledge about the genetic mechanisms in sterility of the top spikelets and the basal spikelets at the QTL level.To enhance this understanding,two related F_8:9 recombinant inbred lines (RILs) populations were generated.They were derived from the cross between Jing 411 and Kenong 9204 (KJ) and between Jing 411 and Xiaoyan 6 (JY),comprising 427 and 192 lines,respectively.The phenotypic data collected from four environments were used for data analysis.Based on the results of phenotypic correlation coefficients and path coefficients,we found that TSSN played key roles in determining SSN,but this results were opposite to that of previous study.The correlation coefficients for the single traits between pairs of experiments indicated that the three traits were greatly influenced by the environment.Among these,environment has the highest level influence on SSN,next to BSSN.As we know,each component has a impact on the final phenotypic data of complex trait,which account for the above results.The results of QTL detection suggested that every trait owned its unique QTL,though they shared common QTL to some extent.The QTL for SSN were not always common either to these of BSSN or TSSN,however,TSSN shared more QTL with these of SSN.The results above would provide the theoretical basis for the genetic improvement for sterility of the spikelets and the implementation of reasonable cultivation measures for high yield.

Key words: Wheat, Basal sterile spikelets, Top sterile spikelets, RILs, QTL

CLC Number: 

• S512.03