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Crop Science Abstract -

Effects of Self- and Cross-Compatibility on the Frequency of Hybrids in Medicago sativa L.1


This article in CS

  1. Vol. 7 No. 5, p. 536-538

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  1. A. E. Carleton and
  2. R. F. Eslick2



The influence of self- and cross-compatibility of both parents on seed production potential and the percentage of crossed seed in. hybrids was studied. In separate studies a wide range in self- and cross-compatibility of seven white flowered clones used as pistillate parents was found. Self- and cross-compatibility were closely associated. In separate studies four of the five purple flowered clones used as male parents were rated as very low in selffertility. Cross-compatibility as males of the five purple flowered clones varied; however, none rated high in crosscompatibility. In crosses between white flowered and purple flowered clones, pods per flower and seed per flower declined rapidly as self-compatibility of the female parent decreased. Selection for low self-compatibility resulted in low seed yield regardless of mating pattern. Pod and seed production were also influenced by the level of male cross-compatibility of the male parent. The percentage of crossed seed in the hybrids was not closely associated with self-compatibility of the female parent. Male cross-compatibility was associated with the percentage of crossed seed in the hybrids. Specific combinations yielded 100% crossed seed, while other combinations within the same levels of self- and cross-compatibilities yielded 0% crossed seed. A type of “specific combining ability” for the production of hybrids was suggested.

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