Afiukwa, Celestine Azubuike Afiuwka, Faluyi, Julius Olaoye, Atkinson, Christopher John, Ubi, Benjamin Ewa Ubi, Igwe, David Okechukwu and Akinwale, Richard Olutayo (2016) Screening of some rice varieties and landraces cultivated in Nigeria for drought tolerance based on phenotypic traits and their association with SSR polymorphisms. African Journal of Agricultural Research, 11 (29). pp. 2599-2615. ISSN 1991-637X (Print), 1991-637X (Online) (doi:10.5897/AJAR2016.11239)

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Abstract

Breeding for drought tolerance based on direct selection for high grain yield under drought has been hindered by the complex nature of drought tolerance mechanisms and the approaches used. Molecular marker-based approaches are a promising alternative. In this study, 30 rice (Oryza sativa L.) accessions cultivated in Nigeria were screened in a greenhouse for drought tolerance based on morpho-physiological traits and assessed for DNA polymorphisms using SSR markers for possible marker – trait associations. Our results showed that five Nigerian rice landraces (IJS-02, IJS-09, IK-PS, IK-FS and Lad-f) and three improved varieties (FARO-44, IR-119 and IWA-8) were highly drought tolerant. Sixteen of 20 markers tested yielded amplified products and generated 221 alleles (4 – 5 alleles per marker) with PIC values ranging from 0.24 - 0.95 per marker. Although, none of the markers were present in all the accessions that were found to be highly drought tolerant with respect to any particular morph-physiological trait, some of the markers (RM252, RM331, RM432, RM36, RM525, RM260 and RM318) amplified alleles unique to nearly all the tolerant Nigerian landraces (IJS-02, IJS-09, IK-PS, IK-FS) and FARO-11, a drought tolerant control. These markers may be usefully exploited for molecular breeding of rice for drought tolerance.

Item Type:	Article
Additional Information:	Copyright © 2016 Author(s) retain the copyright of this article. This article is published under the terms of the Creative Commons Attribution License 4.0
Uncontrolled Keywords:	Nigeria, climate change, rice, drought stress, drought tolerance, SSR markers, molecular breeding.
Subjects:	S Agriculture > SB Plant culture
Faculty / School / Research Centre / Research Group:	Faculty of Engineering & Science Faculty of Engineering & Science > Natural Resources Institute > Ecosystem Services Research Group
Last Modified:	26 Jul 2017 10:25
URI:	http://gala.gre.ac.uk/id/eprint/15589

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