Association Analysis Of Wheat Lodging Traits

Lodging is an important factor to limit increasing of wheat yield.identifying the molecular markers for lodging resistance not only understand the mechanism,but also contribute to lodging resistance breeding.In this study,three phenotypic traits including plant height,stem strength and lodging index were measured in 105 materials in 2014.Association and correlation analysis were conducted between 235 SSR markers and three phenotypes,the results were as follows:1.Plant height and stem strength had a significantly negative correlation(-0.464**);Plant height and lodging index had a significantly positive correlation(0.525**);Stem strength and lodging index had a significantly negative correlation(-0.410**).2.A total of 17 significant(p<0.05)marker-trait associations were identified for plant height,among which 13 were very significant(p<0.01),and were located on chromosomes1 A,1D,2B,3A,3D,4B,5D,6A,7A and 7B respectively.The contribution rate was5.92%-22.92%,the highest was Xbarc44 on 5D(22.92%).3.A total of 21 significant(p<0.05)marker-trait associations were identified for stem strength,among which 9 were very significant(p<0.01),and were located on chromosomes 1A,3A,5D,7A and 7B respectively.The contribution rate was6.04%-16.26%,the highest was Xbarc310 on 3A(16.26%).4.A total of 20 significant(p<0.05)marker-trait associations were identified for lodging index,among which 8 were very significant(p<0.01),and were located on chromosomes 1A,1D,2B,3A and 5D respectively.The contribution rate was9.53%-20.86%,the highest was Xwmc590 on 1D(20.86%).5.A total of 6 molecular markers were identified simultaneously for three phenotypic traits and were located on chromosomes 1A(Xcfd59),2B(Xwmc179),3A(Xbarc44),5D(Xbarc45),7A(Xwmc179)and 7B(Xwmc517).Those markers on 7A and 7B has not been reported and are likely to be novel.