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Research articles

ScienceAsia (): 265-272 |doi: 10.2306/scienceasia1513-1874...265

Quantitative trait loci linked to plant production traits in rice (Oryza sativa) under drought stress in a target environment

Kanjivavila Raghavan Bijia, Paramasivam Jeyaprakashb, Siruthaiyur Krishnamoorthy Ganeshc, Alagarswamy Senthila, Ranganathan Chandra Babud,*

ABSTRACT:     Drought stress is the major constraint to rice (Oryza sativa) production and yield stability in rainfed ecosystems. Identifying genomic regions contributing to drought resistance will help to develop rice cultivars suitable for rainfed regions through molecular marker-assisted breeding. Quantitative trait loci (QTLs) linked to plant production traits under drought stress were mapped by evaluating 155 F7 recombinant inbred (RI) lines of IR58821-23-B-1-2-1/IR52561- UBN-1-1-2 under rainfed and irrigated conditions in the target environment. The RI lines were subjected to water stress during grain filling by natural rainfall failure events in two successive seasons. The RI lines showed significant variation in plant phenology, plant biomass, yield, and yield components under rainfed and irrigated conditions. Grain yield under rainfed condition had a positive correlation with harvest index and negative correlations with spikelet sterility and the number of days to 50% flowering. A total of 11 QTLs, identified for various plant phenology and production traits under rainfed and irrigated conditions, accounted for 9.323.4% of the phenotypic variation. A genomic region identified on chromosome 2 harboured a large effect QTL for grain yield (23.4%) under rainfed conditions. The region C499-PC11M1 on chromosome 2 identified for grain yield under rainfed conditions was colocated with QTLs associated with root traits.

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a Department of Plant Molecular Biology and Biotechnology, Tamil Nadu Agricultural University, Coimbatore, India
b Agricultural College and Research Institute, Tamil Nadu Agricultural University, Madurai, India
c National Pulses Research Centre, Tamil Nadu Agricultural University, Vamban, India
d Dean, School of Post Graduate Studies, Tamil Nadu Agricultural University, Coimbatore, India

* Corresponding author, E-mail: chandrarc2000@yahoo.com

Received 17 Aug 2007, Accepted 24 Jun 2008