Identification of quantitative trait loci under drought conditions in tropical maize. 1. Flowering parameters and the anthesis-silking interval View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1996-05

AUTHORS

J. -M. Ribaut, D. A. Hoisington, J. A. Deutsch, C. Jiang, D. Gonzalez-de-Leon

ABSTRACT

Drought is an important climatic phenomenon which, after soil infertility, ranks as the second most severe limitation to maize production in developing countries. When drought stress occurs just before or during the flowering period, a delay in silking is observed, resulting in an increase in the length of the anthesis-silking interval (ASI) and in a decrease in grain yield. Selection for reduced ASI in tropical open-pollinated varieties has been shown to be correlated with improved yields under drought stress. Since efficient selection for drought tolerance requires carefully managed experimental conditions, molecular markers were used to identify the genomic segments responsible for the expression of ASI, with the final aim of developing marker-assisted selection (MAS) strategies. An F2population of 234 individuals was genotyped at 142 loci and F3 families were evaluated in the field under several water regimes for male flowering (MFLW), male sterility (STER), female flowering (FFLW) and ASI. The genetic variance of ASI increased as a function of the stress intensity, and the broad-sense heritabilites of MFLW, FFLW and ASI were high under stress conditions, being 86%, 82% and 78%, respectively. Putative quantitative trait loci (QTLs) involved in the expression of MFLW and/or FFLW under drought were detected on chromosomes 1, 2, 4, 5, 8, 9 and 10, accounting for around 48% of the phenotypic variance for both traits. For ASI, six putative QTLs were identified under drought on chromosomes 1, 2, 5, 6, 8 and 10, and together accounted for approximately 47% of the phenotypic variance. Under water stress conditions, four QTLs were common for the expression of MFLW and FFLW, one for the expression of ASI and MFLW, and four for the expression of ASI and FFLW. The number of common QTLs for two traits was related to the level of linear correlation between these two traits. Segregation for ASI was found to be transgressive with the drought-susceptible parent contributing alleles for reduced ASI (4 days) at two QTL positions. Alleles contributed by the resistant line at the other four QTLs were responsible for a 7-day reduction of ASI. These four QTLs represented around 9% of the linkage map, and were stable over years and stress levels. It is argued that MAS based on ASI QTLs should be a powerful tool for improving drought tolerance of tropical maize inbred lines. More... »

PAGES

905-914

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00221905

DOI

http://dx.doi.org/10.1007/bf00221905

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1035416265

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/24166558


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207 grid-institutes:grid.433436.5 schema:alternateName CIMMYT, Apartado Postal 6-641, 06600, Mexico D. F., Mexico
208 schema:name CIMMYT, Apartado Postal 6-641, 06600, Mexico D. F., Mexico
209 rdf:type schema:Organization
 




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