Selection in early generations and the occurrence of heterosis for the character root distribution

Toaldo, D. and Morais, P. P. P. de and Battilana, J. and et al, . (2012) Selection in early generations and the occurrence of heterosis for the character root distribution. Euphytica. 10 p..

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Crops of bean are sensible to climate changes, especially water stress. One way to minimize this instability is through genetic breeding of root system character. Thus, the objective of this study was to identify genotypes with superior root system in the first segregating generation at three depths in the soil profile and also verify the occurrence of heterosis for the root system character. Evaluations were performed using the method of Bohm (Methods studying root systems. Springer, Berlin 1979) at three different depths (0–10, 10–20 and 20–30 cm), in the experimental area of the Institute of Molecular Genetics and Breeding, at the State University of Santa Catarina UDESC Lages-SC. Twelve segregating populations and four parents (BAF 09, BAF 07, BAF 50 and IPR Uirapuru) were assessed by comparison. The favorable genotypes to the progress of generations are: two, seven and three for depths up to 20 cm and three for depths up to 30 cm. The cross between the parentsBAF 07 (black group) and BAF 50 (carioca group) presented wide genetic divergence, providing significant increase in the root system revealed by the analysis of their progenies. The selection of superior genotypes in the layer of 20–30 cm was limited because most genotypes have similar and poorly distribution. Due to the strong effect of the dominance component, heterosis occurred for root distribution in early generation. This fact may interfere in the selection of autogamous species of bean related to this genetic character.

Item Type: Article
Additional Information: We would like to thank the Universidade do Estado de Santa Catarina (UDESC), the Conselho Nacional de Desenvolvimento Cientı´fico e Tecnolo´gico (CNPq), the Coordenac¸a˜o de Aperfeic¸oamento de Pessoal de Nı´vel Superior (CAPES) and the Fundac¸a˜o de Apoio a Pesquisa Cientifica e Tecnolo´gica do Estado de Santa Catarina (FAPESC) for granting the scholarship and funding for this work.
Uncontrolled Keywords: Phaseolus vulgaris L. , Abiotic stress , Genetic variability, Soil profile
Author Affiliation: Department of Agronomy, Institute of Molecular Genetics and Improvement of UDESC (IMEGEM), Graduate Program in Agricultural Sciences, UDESC State University of Santa Catarina, Av. Luiz de Camoes, 2090-Cash Account, Lages, SC 88520-000, Brazil
Subjects: Crop Improvement > Genetics/Genomics
Divisions: General
Depositing User: Mr Siva Shankar
Date Deposited: 13 Jul 2012 05:35
Last Modified: 13 Jul 2012 05:35
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