Genetic Dissection of Reproductive Stage Salinity Tolerance in Rice Using Salt Tolerant Cultivar MTU 1061
K. Vijaya Durga
*
Department of Genetics and Plant Breeding, Agricultural College, Bapatla, ANGRAU, 522101, India.
P. Venkata Ramana Rao
Division of Genetics and Plant Breeding, Regional Agricultural Research Station, Maruteru, Andhra Pradesh, 534 122, India.
P. V. Satyanarayana
ANGRAU, Andhra Pradesh, 532484, India.
K. Jayalalitha
Department of Genetics and Plant Breeding, Agricultural College, Bapatla, ANGRAU, 522101, India.
*Author to whom correspondence should be addressed.
Abstract
Enhancement in salt tolerance at reproductive stage is very essential for increase in the grain yield and extremely desirable to sustain production in salinity affected areas. In the current study, 234 F2 population were derived from MTU 1061, which is salinity tolerant high yielding variety and MTU 1121, saline sensitive rice variety. We applied 1,001 rice SSR markers spanning all 12 chromosomes of rice to study parental polymorphism. The linkage map has been generated with 104 polymorphic markers and 234 F2 mapping population. We identified 25 QTLs which explained 0.2-7.9% phenotypic variance at LOD score 2.10-6.55 using Kosambi mapping function by IciMapping. The two parental lines contributed QTLs for the yield traits. In our study, majority of the QTLs were mapped for the first time and these QTLs controlling reproductive stage salinity tolerance associated traits, will be useful in marker-assisted breeding programs to develop salinity tolerant rice varieties.
Keywords: Salinity, rice, QTL, reproductive stage, salt tolerance, Mapping