Gene Inheritance pattern of salinity tolerance identified through phenotypic scoring and marker data in mapping population of rice (Oryza sativa L.)

Abstract

Soil salinity is one of the major constraints affecting rice production worldwide. Susceptibility or tolerance of rice plants to high salinity is a coordinated action of multiple stress responsive genes. Salt tolerant varieties can be produced through marker-assisted selection by introducing salt-tolerance genes. The current study aims to understand the inheritance pattern of salinity tolerance genes. The investigation was carried during 2014-2017, 25 days old seedlings were raised in nursery beds at Agricultural College and Research Institute, Madurai, Tamil Nadu and transplanted to main field at Vedapatti village in Thoothukudi district which is a hot spot area for saline condition in a Randomized Block Design under saline stress condition with two replications. After 21 days of transplanting, the phenotypic scoring was done for all the six generations. Ten plants each in P1, P2 and F1, 250 plants in F2 and 150 plants each in BC1 and BC2 for each cross in each replication were maintained for the study. The investigation indicated that the inheritance pattern of salinity tolerance gene was duplicate dominant genes as observed from the F2 ratio of 15:1 (susceptible: tolerant) in crosses 1 and 2 under salinity condition in both In-vivo and In-vitro.