Norin 10 semi-dwarfism in tetraploid wheat and associated effects on yield.
1981
Gale M.D. | Marshall G.A. | Gregory R.S. | Quick J.S.
A genetic study of a range of Norin 10 based semi-dwarf durum wheats showed that only Gai/Rht1, located on chromosome 4A, was present. No varieties carrying a second Gai/Rht allele were identified and deliberate attempts to introduce Gai/Rht2 into tetraploid wheats have so far been unsuccessful. In a spaced plant trial of homozygous random F(,3) lines from two tall x semi-dwarf crosses, the semi-dwarfs had lower ear yields, due mainly to reduced kernel weight, but had higher tiller numbers than the tall genotypes. Although there was no difference in overall plant yield between talls and semi-dwarfs, an analysis of character associations within the semi-dwarf F(,3)'s showed positive height-yield and height-kernel weight correlations indicating that selection for 'tall dwarfs' may be a useful breeding strategy in tetraploid wheats.
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