Genetic Mapping Of Morpho-Physiological Traits Involved During Reproductive Stage Drought Tolerance In Rice

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Abstract
Reproductive stage drought stress is an important factor for yield reduction in rice. Genetic mapping of drought responsive QTLs will help to develop cultivars suitable for drought prone environments through marker-assisted breeding. QTLs linked to morpho-physiological traits under drought stress were mapped by evaluating 190 F 7 recombinant inbred lines (RIL). Significant variations were observed for eleven morpho-physiological traits involved during the stress. Bulked segregant analysis (BSA) strategy was adopted for genotyping the RIL population. A total of 401 SSR primers were tested for parental polymorphism of which 77 were polymorphic. Inclusive composite interval mapping detected a total of five consistent QTLs controlling leaf rolling ( qLR 9 .1 ), leaf drying ( qLD 9 .1 ), harvest index ( qHI 9 .1 ), spikelet fertility ( qSF 9 .1 ) and relative water content ( qRWC 9 .1 ) under reproductive stage drought stress. Another two non-allelic QTLs controlling leaf rolling ( qLR 8 .1 ) and leaf drying ( qLD 12 .1 ) were linked in a single year. QTL controlling leaf rolling, qLR8.1 was validated in this mapping population and useful in marker-assisted breeding (MAB) programs. Out of these five consistent QTLs, four ( qLR 9 .1 , qLD 9 .1 , qHI 9 .1 and qRWC 9 .1 ) were detected to be novel QTLs and useful for MAB for reproductive stage drought tolerance in rice.
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