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University of Zambia (2007)

Combining Ability For Drought Tolerance in Common Beans

Makunde, Godwin Simbarashe

Titre : Combining Ability For Drought Tolerance in Common Beans

Auteur : Makunde, Godwin Simbarashe

Université de soutenance : University of Zambia

Grade : Master of Science in Agronomy 2007

Résumé partiel
The common bean (P. vulgaris. L) is an important crop in Africa. The seeds are used dry or green for human consumption and leaves are occasionally used as a leaf vegetable. As a legume beans are capable of fixing nitrogen into the soil for subsequent crops.Though important as a food crop and in soil amelioration, common bean is exposed to a number of abiotic and biotic stresses, one of which is drought, exceeded in magnitude only by bean diseases. The recent land ownership in Zimbabwe have seen the opening up of new lands for agriculture, mainly cropping, resulted in marginal areas, characterized by drought environments, being put under a wide range of crops. The majority of the small scale farmers are found in these areas and this call for the development of appropriate bean varieties. The characterization of the bean germplasm so as to know the inheritance of important traits for drought tolerance is cardinal since the genetic improvement for drought tolerance is seen as a better approach for crop security than complex knowledge based agronomic practices. This study was therefore carried out to estimate the general and specific combining abilities for drought tolerance in 25 f2 populations of Andean x Andean and 24 populations of Andean x Mesoamerican bean gene pools and determine the mode of gene action for drought tolerant traits. The two f2 populations were subjected to irrigated and water stressed conditions. Significant differences were observed in grain yield, days to 50% flowering , 100-seed weight and days to maturity at 5% level for the Andean x Andean and Andean x Mesoamerican f2 populations under water stressed conditions. Red Canadian Wonder gave a desirable GCA for grain yield(0.11), days to 50% flowering (-0.57) and days to 95% maturity (-1.71) under water stressed conditions in the Andean x Andean f2populations. Also SAB259 had also desired GCA for grain yield (0.05), days to 50% flowering (-0.51)and days to 95% maturity(-0.11) in the same populations.

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