Genetic variation in osmoregulation in bread and durum wheats and its relationship to grain yield in a range of field environments
1986
Morgan, J.M. | Hare, R.A. | Fletcher, R.J. (New South Wales Dept. of Agriculture, Tamworth (Australia). Agricultural Research Centre)
Measurements of osmoregulation were made on plants grown in pots in a glasshouse and measurements of grain yields made in a wide range of field environments. The genotypes were advanced lines from two distinct breeding programs and all the genotypes in each program (27 bread and 14 durum) were closely related in having a common parent. The grain yields of the bread wheats were evaluated in 56 field trials covering a period of 4 years, and those of the durum wheats were evaluated in seven field trials in one year. Both droughted and irrigated sites were represented. Considerable variation in osmoregulation occurred which was positively associated with grain yield over the full range of environments sampled for each genotype group. The yields of genotypes which were high in osmoregulation were 11-17 percent higher in bread wheats and 7 percent higher in durum wheats than those which were low in osmoregulation, when class differences were based on maximising the average yield differences between osmoregulation groups.
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