Genetic control of nodulation in common bean [Phaseolus vulgaris L.]
Genetic analysis of the ability of common bean (Phaseolus vulgaris L.) genotypes to form root nodulates was made using a diallel cross of five genotypes inoculated with Rhizobium tropici strain CIAT 899. The number of nodules per plant (NN), nodule dry weight (NDW) and mean nodule weight (MNW) were...
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Published in | Journal of Genetics & Breeding (Italy) Vol. 56; no. 2 |
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Main Authors | , , , , , |
Format | Magazine Article |
Language | English |
Published |
01.06.2002
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Subjects | |
Online Access | Get more information |
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Summary: | Genetic analysis of the ability of common bean (Phaseolus vulgaris L.) genotypes to form root nodulates was made using a diallel cross of five genotypes inoculated with Rhizobium tropici strain CIAT 899. The number of nodules per plant (NN), nodule dry weight (NDW) and mean nodule weight (MNW) were assessed. Analysis of components of genetic variation showed that both additive and dominance gene effects were involved in the control of all studied traits. Estimates for mean degree of dominance indicated the presence of overdominance, incomplete dominance and complete dominance for NN, NDW and MNW, respectively. The heritabilities in the broad sense were generally high, while, in the narrow sense, they varied from low for NN to moderate for NDW and MNW
[E' stata effettuata un'analisi genetica della capacita' di genotipi di fagiolo (Phaseolus vulgaris L.) di formare tubercoli radicali, usando un incrocio diallelico di cinque genotipi inoculati con Rhizobium tropici ceppo CIAT 899. Sono stati valutati il numero di tubercoli per pianta (NN), il peso secco (NDW) e il peso medio dei tubercoli (MNW). L'analisi dei componenti della variazione genetica ha dimostrato che gli effetti sia del gene additivo, sia di quello dominante erano coinvolti nel controllo di tutti i caratteri studiati. Stime del grado medio di dominanza hanno indicato la presenza di sopradominanza, dominanza incompleta e dominanza completa per NN, NDW e MNW, rispettivamente. Le ereditabilita' in senso ampio risultavano generalmente alte, mentre, in senso stretto, variavano da basse per NN a moderate per NDW e MNW] |
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Bibliography: | P34 2003063357 F30 |
ISSN: | 0394-9257 |