Abstract
One hundred and eighty-nine Chinese cultivars of common wheat were crossed to three testers for necrosis and chlorosis genes, and their genotypes were determined.
Three genotypes, Ne1ne2, ne1Ne2 and ne1ne2 for necrosis were found in 39.3, 7.1 and 53.6% of the cultivars, respectively. As to chlorosis genes, the great majority of cultivars (93.4%) were of the genotype, ch1Ch2, the remainder (6.6%) were ch1ch2. It was evident that common wheat retained its characteristic population structure regarding necrosis and chlorosis during its eastward dispersion from Central Asia to Japan through China. No particular geographical inclination in the frequencies of various necrosis and chlorosis genotypes, nor their special association with the two characters, growth habit and awnedness, was detected.
