Study on Preharvest Sprouting Resistance of Tom Thurmb in Wheat
Near isogenic lines from Tom Thurmb and their segregating populations were analyzed for resistance to preharvest sprouting resulted from dwarf gene Rht3 and gibberellic acid insensitive gene Gai3. The result showed that Rht3 and Gai3 were closely associated with preharvest sprouting resistance. Resistance to preharvest sprouting was apparently different in parents.The germinating percentage of dwarf Yangmai3 and dwarf Sumai3 were 8 26% and 11 47%,and the percentage of their recurrent parent Yangmai3 and Sumai3 were 56 37% and 66 87%,respectively.Germinating percentage in segregating populations also showed differently.Dwarf or semidwarf plants with gibberellic acid insensitivity exhibited lower sprouting percentage,but the tall plants of gibberellic acid sensitivity had high sprouting percentage.Correlation coefficients between plant height,gibberellic acid,α amylase activity and preharvest germinating percentage in two segregating population were 0 8585 and 0 6562, 0 8103 and 0 6435, 0 8585 and 0 8928 at dominantly significant level. Rht3 and Gai3 could reduce α amylase activity and hence enchanced the resistance to preharvest sprouting.