GENETIC BASIS OF ION UPTAKE AND PROLINE ACCUMULATION IN GOSSYPIUM HIRSUTUM L.

M. T. Azhar, G. Nabi, F. M. Azhar, S. Shokat

Abstract: Inheritance of Na+, K+/Na+ uptake and proline accumulation at maturity was studied in six, Gossypium hirsutum L. cultivars using diallel analysis. Parents and F1s were grown in 0, 17.5 and 20 dSm-1 salt in iron containers. At maturity, leaf samples were collected to measure Na+, K+/Na+ and proline accumulation in the plant material. Indices of salt tolerance (relative values) of Na+, K+/Na+ and proline accumulation were used for genetic analysis following Hayman-Jinks approach. Joint regression coefficients (b) were used to assess the validity of data sets to the simple genetic model, and the model was found to be adequate for analyzing all data sets. It was revealed that genes controlling variation are additively controlled, and hence the estimates of h2 were high under low and high salinity. These results suggest variation in these characters and potential for improving salinity tolerance in cotton. The plants with low Na+, greater K+/Na+ ratio and greater proline accumulation may be selected from segregating population of the examined material.

Keywords: diallel analysis; narrow sense heritability; proline; salinity

Date published: 2017-09-18