Abstract
Semidwarf genes from ‘Norin‐10’ and other semidwarf varieties have been used widely in breeding high‐yielding hexaploid wheats (Triticum sp.). These genes also have been transferred to tetraploid durum wheat (Triticum turgidum L.). The effect of the semidwarf genes on eight agronomic characteristics of durum wheat were investigated at two locations in each of 2 years, using paired tall and semidwarf near‐isogenic lines. The semidwarf genes and their associated linkage blocks reduced test weight, kernel weight, and height; increased days to heading and number of culms/ha; but did not affect yields, kernels/spike, or grain/straw ratios. Semidwarf lines with adequate test weights and kernel weights were observed in some crosses. Acceptable semidwarf varieties of durum wheat can be produced if the plant breeder selects carefully for high test weight and kernel wieght.
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