Evaluation of maize core collection for drought tolerance
The maize genebank (GBmaize) preserves nearly 4,000 accessions for conservation and use. The use is however restricted because the accessions do not perform as well as the elite genotypes. This problem can be reduced by pre-breeding, i.e., by extending the information on germplasm and introgressing...
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Published in: | Crop breeding and applied biotechnology Vol. 10; no. 4; pp. 312 - 320 |
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Main Authors: | , , , , , , , , , , |
Format: | Journal Article |
Language: | English |
Published: |
Crop Breeding and Applied Biotechnology
01-12-2010
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Subjects: | |
Online Access: | Get full text |
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Summary: | The maize genebank (GBmaize) preserves nearly 4,000 accessions for conservation and use. The use is however restricted because the accessions do not perform as well as the elite genotypes. This problem can be reduced by pre-breeding, i.e., by extending the information on germplasm and introgressing useful alleles. Since irregular rainfall distribution and drought induce maize yield losses, drought tolerance is a main breeding target. In this study, the GBmaize accessions were evaluated for drought tolerance. Environmental factors, genotypes and the respective interactions influence the phenotypic expression. There was however no interaction genotype - irrigation level, so no accessions with different performance under the two water regimes could be identified. The performance of the following accessions was promising for a number of traits: SP154, BA166, MG099, CE002, SE025, BA154, BA194, BA085, MG076, PR053, Roxo Macapá, SE016, and AL018.
O banco de germoplasma de milho (BGMilho) preserva quase 4000 acessos visando conservação e uso. Entretanto, esse uso é reduzido, pois seus acessos apresentam desempenho inferior aos genótipos elite. O pré-melhoramento visa contornar esse problema, ampliando a informação sobre o germoplasma e introgredindo alelos úteis. A má distribuição de chuvas e a seca levam a perdas de produção de milho, o que faz com que a tolerância à seca seja uma das prioridades do melhoramento.Neste trabalho, foram avaliados acessos do BGMilho quanto à tolerância à seca. Fatores ambientais, genotípicos e suas interações influenciaram a manifestação fenotípica, entretanto a interação entre genótipos e regimes de irrigação esteve ausente, levando a não identificação de acessos com comportamento diferenciado nas duas condições hídricas. Os seguintes acessos foram destacados devido ao comportamento superior para vários caracteres: SP154, BA166, MG099, CE002, SE025, BA154, BA194, BA085, MG076, PR053, Roxo Macapá, SE016 e AL018. |
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Bibliography: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-70332010000400005&lng=en&nrm=iso&tlng=en |
ISSN: | 1984-7033 1984-7033 |
DOI: | 10.1590/S1984-70332010000400005 |