Inheritance and nature of resistance to two spotted spider mite in common bean [electronic resource].

Includes references.

Crosses were made between cultivars Emy, Sigme, Oxyra, paulista and Giza~ to study the inheritance and nature of spider mite resislance and some component characters which may have direct or indirect effects on spider mite resistance. Such characters were recorded for the individual plants of the different populations of parents, F₁F₂ Bc₁ and Be₂. Spider mite resistance, fruit set percentage and total dry seed yield per plant were found to be inherited quantitatively. Partial dominance were observed for high resislance to spider mite, high fmit set percentage and high total dry seed yield/plant over the low levels of these characters. The broad sense heritability estimates for spider mite resislance ranged from intermediate (51.32%) to relatively high (86.43%), and that calculated for fruit set percentage ranged from below intermediate (43.40%) to high intermediate (65.26%), as well as that calculated for total dry seed yield/plant ranged from below intermediate (42.06%) to relatively high (74.22%) in the different crosses. On the other hand, the narrow sense heritability estimates for spider mite resistance ranged from low (27.48%) to below intermediate (46.21%); for fruit set percentage ranged from 35.61% to 56.03o/aand that calculated for total dry seed yield/plant ranged from low (25.08%) to below intermediate(48.63%)in all crosses.

Summary in Arabic.

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