Genetic Basis of Ion Uptake and Proline Accumulation in Gossypium hirsutum L.

1 Vegetable Research Station, Farooqabad, Pakistan
2 Chickpea Laboratory, Nuclear Institute for Agriculture and Biology (NIAB), 128 Faisalabad, Pakistan
3 Department of Plant Breeding and Genetic, University of Agriculture, Faisalabad, Pakistan


NABI, G., S. SHOKAT, M. T. AZHAR and F. M. AZHAR, 2015. Genetic basis of ion uptake and proline accumulation in Gossypium hirsutum L. Bulg. J. Agric. Sci., 21: 835–842

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.

Key words: diallel analysis, narrow sense heritability, salinity, proline
Abbreviations: D - additive gene effects; dSm-1 - deci Siemens per meter; E - environmental component; EC - electrical conductivity; F - estimation of relative frequency of dominance and recessive alleles in the parents; (H1 /D)0.5 - average degree of dominance; H1 and H2 - dominance effects of genes; H2/4H1 - proportion of gene with positive and negative effects in the parents; h2 - overall dominance effect; h2 - heritability in narrow sense; NaCl - sodium chloride; K – Potassium; TSS - total soluble salts.

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