Comparative Assessment of Genetic parameters in Tomato (Lycopersicon esculentum L.) germplasm under Normal moisture and Osmotic Stress in in vitro condition

摘要

Thirty five tomato genotypes were evaluated to assess the nature and extent of genetic variability, heritability and genetic advance under both normal (0% PEG-6000 as control) and osmotic stress condition (12 % PEG-6000) in germination phases in threereplications in a completely randomized design. The observations on germination per cent, root length, shoot length, seedling length, root to shoot ratio and seed vigour were recorded on tenth day after incubation. The results of the analysis of variance for all the characters studied were found to be highly significant in both the conditions indicating the availability of large variability in the study material. A high range of variation and high heritability coupled with high genetic advance was recorded for most of the traits. It indicates the broad genetic base and less environmental influence which specifies the predominance of genetic factor controlling variability. Hence, early generation selection schemes would be effective for improvement. Further, there exists an ample scope for isolation of promising lines from the present gene pool for drought tolerance.