EurekaMag.com logo
+ Translate

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


, : Identification of quantitative trait loci under drought conditions in tropical maize. 1. Flowering parameters and the anthesis-silking interval. Tag. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik 92(7): 905-914

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.

Order PDF Full Text

Close
Close

Click here to order any other PDF Full Text


Accession: 002863730

PMID: 24166558

DOI: 10.1007/BF00221905

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


Submit PDF Full Text

No spam - Every submission is manually reviewed

Due to poor quality, we do not accept files from Researchgate

Submitted PDF Full Texts will always be free for everyone
(We only charge for PDFs that we need to acquire)

Select a PDF file:
Close
Close

Other references

Echeverria, E.; Salerno, G., 1993: Properties of partially purified sucrose-phosphate phosphatase from rice leaves. Plant Physiology (Rockville) 102(1 SUPPL ): 54

Suvajdzić, N.; Pavlović, M.; Misić, S.; Cemerikić, V.; Atkinson, H.D.; Colović, M., 2001: Secondary myelofibrosis in visceral leishmaniasis--case report. A 39-year-old woman with a history of travel to the Montenegrin coast presented with a 9-month long history of fever and weakness, and on examination was found to be emaciated with hepatosplenomegaly and pancytopenia. Marrow aspiration showed poor...

Duke R.B.; Bloor B.M.; Nugent G.R.; Majaoub H.S., 1968: Changes in performance on wechsler adult intelligence scale trail making test and finger tapping test associated with carotid artery surgery human. Perceptual & Motor Skills 26(2): 399-404

Maron, B.A.; Shekar, P.S.; Goldhaber, S.Z., 2010: Paradoxical embolism. Circulation 122(19): 1968-1972

van Hemmen, J.Leo., 2015: Neuroscience from a mathematical perspective: key concepts, scales and scaling hypothesis, universality. This article analyzes the question of whether neuroscience allows for mathematical descriptions and whether an interaction between experimental and theoretical neuroscience can be expected to benefit both of them. It is argued that a mathematizati...

Gutman, G., 1976: Headache and the joints of the atlanto-occipital region. Schweizerische Rundschau für Medizin Praxis 65(35): 1059-1072

Macintire, D. K., 1988: The acute abdomen - differential diagnosis and managment. This review covers pathogenesis of abdominal pain, the general approach to the animal with acute abdomen, differential diagnosis, signalment, history physical examination, laboratory diagnostic tests, diagnostic peritoneal lavage and treatment.

Kozowski, S.; Stuczynska, E., 1999: Variation in the shape of Lolium perenne spikes - an investigation of the causes. The morphological diversity of spikes among taxonomic units in Lolium perenne described by Hegi was investigated in 1985-97. Considerable variability in the shape, size and morphological properties of the inflorescences was found which enabled the...

Pelis, R.M.; Shahidullah, M.; Ghosh, S.; Coca-Prados, M.; Wright, S.H.; Delamere, N.A., 2009: Localization of multidrug resistance-associated protein 2 in the nonpigmented ciliary epithelium of the eye. The nonpigmented epithelium (NPE) of the ciliary body represents an important component of the blood-aqueous barrier of the eye. Many therapeutic drugs penetrate poorly across the NPE into the aqueous humor of the eye interior. Several of these th...

Lipley, N., 2015: Use your vote on May 7. Nursing Management 22(2): 5-5