Chromosomal distribution and genetic expression of Lophopyrum elongatum (Host) A. Love genes for adult plant resistance to stripe rust in wheat background

A set of wheat cv. Chinese Spring (CS)-Lophopyrum elongatum addition and su bstitution lines has been analyzed for its potential to offer new sources o f stripe rust resistance for wheat. The adult plants of these lines, togeth er with CS-L. elongatum amphiploid and CS, were inoculated by new physiolog ical races CYR-30 and CYR-31 of stripe rust in China. The resistance invest igation indicated that chromosome 7E1 of L. elongatum was responsible for t he adult resistance in CS background. Moreover, the expression of the adult s plant resistance derived from chromosome 7E1 in wheat background was depe ndent on the wheat genotype. In addition, the different rust resistance and glutenin composition were observed in 2 CS-L. elongatum amphiploids, indic ating the genetic diversity existed in different origins of L. elongatum.