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Molecular Mapping of QTLs for Drought Related Traits at Seedling Stage under PEG Induced Stress Conditions in Rice

American Journal of Plant Sciences 2011年第2期2卷 190-201页

作者： Akkareddy Srividya Lakshminarayana R. Vemireddy Puram Venkata Ramanarao Sakile Sridhar mudduluru jayaprada Ghanta Anuradha Battiprolu Srilakshmi Hariprasad K. Reddy Arramsetty Subramanyam Hariprasad Ebrahimali Abubackar Siddiq Institute of Biotechnology Acharya NG Ranga Agricultural University

Differential response of seedling characteristics under water stress conditions is known to be associated with drought resistance in rice and elucidation of its genetics could be of help in breeding for tolerance to the stress. A recombinant inbred population derived from the cross between a semi-dwarf variety IR64 and landrace INRC10192 was grown in hydroponic culture and phenotyped for varied responses of seedlings to water deficit imposed by poly ethylene glycol (PEG). The ratio between mean value of seedling trait under stress and control conditions was used for assessing drought tolerance. In all 19 putative QTL relating to five seedling traits viz., shoot length, maximum root length, shoot dry weight, root dry weight and root to shoot dry weight ratio under PEG induced stress conditions were identified confirms that the traditional tall landraces as the one chosen for the study posses hitherto unexploited drought tolerant genes and utilization of them as potential donors in breeding for yield enhancement would be rewarding. They might be useful for improving drought resistance of rice by marker assisted selection/breeding.

关键词： Oryza Sativa L. QTL Mapping RIL Population Seedling Morphology PEG Hydroponic Culture

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