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Crop Science Abstract -

Inheritance of Kernel Number Per Spikelet and Its Association with Kernel Weight in Two Winter Wheat Crosses1


This article in CS

  1. Vol. 23 No. 5, p. 927-931
    Received: Mar 17, 1982

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  1. Osman E. Ibrahim,
  2. H. W. Ohm,
  3. W. E. Nyquist and
  4. R. P. Cantrell2



Inheritance of kernel number per spikelet in wheat (Triticum aestivum L. em. Thell.) was studied using F3 families and parental, F1, backcross F1, and F2 populations from the crosses, ‘Benni’ ✕ ‘Sullivan’ (cross 1) and Benni ✕ ‘Sava’ (cross 2). Benni has a larger number of kernels compared to current soft red winter wheat cultivars. The joint scaling test indicated that the additive-dominance model was inadequate for cross 1 and that epistasis could be one of the possible causes. However, the additive-dominance model was adequate for cross 2. Broad-sense heritability estimates were 0.41 and 0.27 for crosses 1 and 2, respectively, suggesting sizable environmental effects. Narrowsense heritability estimates were 0.18 and 0.14 for crosses 1 and 2, respectively, indicating relatively small additive effects. Four and eight effective factors were estimated to control kernel number/spikelet in crosses 1 and 2, respectively. Negative nonsignificant phenotypic association between kernel number/spikelet and 200-kernel weight was observed. The genotypic correlation was not significantly different from zero, and simultaneous improvement of the two traits is not likely to be difficult.

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