Screening of Rice Genotypes for Salinity Stress Tolerance

Abstract

K Krishna Surendar, N Sritharan, E Sathiyavani, S Krishna Kumar, B.Venudevan, Chelvi Ramesh, T. Balaji and B Nallakurumban

Experiments were conducted at Unit of Crop Physiology, Department of Seed Science and Technology, Agricultural College and Research Institute, Madurai to study the effect of salinity on growth of various genotypes of rice. The varieties (ASD 16 MDU 6 and ADT 45) and landraces (Kuliyadichan, Kallurundaikar and Norungan) were taken for this study. Germination and seedling characters were measured at seventh day after inducing abiotic stress conditions such as, salinity by application of NaCl at 200mM concentration. Physiological and biochemical parameters were estimated at the twentieth day after inducing the salinity stress conditions. The number of seeds germinated, shoot and root length, vigor index, nitrate reductase, α-amylase content and the soluble protein content were studied under the laboratory conditions in comparison to the control. Analyses of variance, revealed significant differences for germination percentage, shoot and root length, vigor index, nitrate reductase, α-amylase and protein contents under salinity. It was evident from the data that increased levels of sodium chloride decreased the germination percent, shoot and root lengths and hence the vigor index nitrate reductase, α- amylase and protein contents linearly.

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