QTL mapping for adult-plant leaf rust resistance genes in Chinese wheat cultivar Weimai 8.

Wang J., Li Z., Shi L., Zhu L., Ren Z., Li X., Liu D., Shah S.J.A. (2015): QTL mapping for adult-plant leaf rust resistance genes in Chinese wheat cultivar Weimai 8. Czech J. Genet. Plant Breed., 51: 79–85. The wheat cultivar Weimai 8 is a good source of adult-plant resistance to leaf rust in China. In order to under stand the genetic background of the resistance genes, 179 F 2:3 families derived from the cross Weimai 8 and Zhengzhou 5389 (susceptible to leaf rust) were used to construct a linkage map. Results showed that there was a major QTL on chromosome 2AS, temporarily named QLr.hbau-2AS, responsible for the resistance. QLr.hbau-2AS from the resistant parent Weimai 8 was between the SSR markers Xcfd36 and Xbarc1138 , with an interval length of 2.58 cM. In the 2010–2011, 2011–2012 and 2012–2013 crop seasons, it explained 25.79, 71.55 and 60.72% of the phenotypic variation, respectively. The location of QLr.hbau-2AS was close to the leaf rust resistance gene Lr37 . However, they may not be the same since QLr.hbau-2AS has a different virulence test response from Lr37 . This study identified two closely linked flanking molecular markers QLr.hbau-2AS and these molecular markers will help marker-assisted selection in breeding resistant cultivars in the future.