Genetic basis of salt (NaCI) tolerance in lentil
1998
Ashraf, M. | Waheed, A. (Bahauddin Zakariya Univ., Multan (Pakistan). Institute of Pure and Applied Biology)
The genetic basis of salt tolerance in adult plants was assessed in six accessions of lentil (Lens culinaris Medik.) which differed significantly in salt tolerance. The accessions were crossed in a diallel crossing design. The salt tolerance of the six parents and their 30 F1 progeny families was assessed in sand culture containing 0 or 30 mol NaCl per m3. Genetic components for salt tolerance were estimated for seed yield, numbers of pods per plant and seeds per plant and 1000-seed weight. As the slope of the regression line for Wr and Vr was equal to zero for seed yield and 1000-seed weight, these characters were excluded from further analysis. Data for numbers of pods per plant and seeds per plant fitted all the assumptions, allowing use of the diallel model as the values of b for both variables were significantly different from zero and equal to 1. Both additive and non-additive effects were significant with the prevalence of additive gene action over dominance for both yield components and numbers of pods per plant and seeds per plant. Although there were different sets of genes of various degrees of dominance controlling salt tolerance in this crop, the dominance in most cases was controlled by recessive genes. The estimates of narrow- and broad-sense heritability were high, indicating potential for improvement in salinity tolerance in this crop through selection and breeding
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