Relative importance of genetic variance for improving broad bean (Vicia faha L.) [electronic resource].

Includes references.

The female broad bean parents: Nubaria-I, Mansoura-l, Kassasin-I, Kassasi-7, Kobrosy, and Aquadulce, were crossed by the male parents Giza-643, Giza¬716, and Giza-717. Eighteen Fl crosses in top crosses scheme (6 x3) were produced during 2004/05 season. In 2005/06 season, nine parents and 18 Fl hybrids were evaluated to explore the combining ability, heterosis, potence ratio, correlation coefficient and average degree of dominance for some traits of broad bean. Significant differences were found between either parents or Fl crosses for all traits. Both additive and non-additive gene actions were important for controlling most of studied traits, Significant to highly significant mean squares of heterosis, females, males, and female x male were recorded for most traits. For plant height, number of branches, flowering date, pod length and diameter, the estimated additive genetic variance were higher ( more than one), suggesting that the total genetic variability were a result of additive and additive x additive types of gene action. Significant progress could be achieved in the segregating generations through selection. Average degree of dominance (ADD) was more than one for number of pods and seeds per pod, pod weight and total green pod yield, suggesting dominance or over-dominance. Therefore, recurrent selection could be useful for upgrading these characters. B0th of the additive and dominance were responsible for the inheritance of seed index.

Summary in Arabic.

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