PJB-2007-15
GENETIC MECHANISMS CONTROLLING SALT TOLERANCE IN GOSSYPIUM HIRSUTUM L. SEEDLINGS
F. M. AZHAR, A. A. KHAN and N. SALEEM
Abstract
Inheritance of salt tolerance at the seedling stage was studied in 5 varieties/lines (both local and exotic) of Gossypium hirsutum L. The five parents were crossed in all possible combinations. The 20 F1 hybrids and their parents were grown in a mixture of sand and soil in 2:1 ratio, following completely randomised design with three replications. The response of the growing seedlings was examined to salinized (250 mM NaCl) and non-salinized (control) conditions. After three weeks, the longest roots of 25 families were measured under the two conditions. Indices of salt tolerance (relative root length) were used for genetic analysis following Hayman-Jinks approach. The regression coefficient (b = 0.566 0.161), and analysis of variance of (Wr+Vr) and (Wr-Vr) showed that the data were fit for genetic analysis. It was revealed that genes acted both additively and non-additively for controlling root length in salinized conditions and estimate of h2ns was 0.37. These results suggest that salt tolerance in the species may be improved further by selecting the plants having longer roots from the segregating generations in salinized media.
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