F3 response to F2 selection for quality and its effect on F3 yield distribution [wheat].
1989
O'Brien L. | Panozzo J.F. | Ronalds J.A.
Seed of F2 single plant selections from 2 crosses was evaluated using a number of small-scale quality tests. F2 quality test values were significantly correlated with farinograph and extensograph properties in the F3, but no one test was correlated with all of the physical dough measures. Applications of independent culling in the F2 for each test did not alter the subsequent nature of the F3 yield distribution except for flour protein content and Zeleny volume, where there was a preferential loss of lines from the higher yielding end. Application of quality testing regimes that estimated grain hardness, protein content and dough strength in the F2 did not adversely affect the nature of the F3 yield distribution, yet permitted up to 71 percent of the population to be removed because of unsatisfactory balance of quality attributes. These results have considerable implications for the planning of wheat breeding programmes.
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