Comparative growth and leaf ionic composition of four cotton (Gossypium hirsutum L.) genotypes in response to salinity
2007
Pervaiz, S. (University of Agriculture, Faisalabad (Pakistan). Saline Agriculture Research Centre) | Saqib, M. (University of Agriculture, Faisalabad (Pakistan). Saline Agriculture Research Centre) | Akhtar, J. | Riaz, M.A. | Anwar-ul-Haq, M. | Nasim, M.
Salinity is a major limiting factor for crop production around the globe. Besides many reclamation strategies, selection of crop cultivars tolerant to salinity can also improve crop production on salt affected lands. The present experiment was planned to study growth and ionic composition of four cotton genotypes as affected by salinity. Genotypes were grown either under salinity (150 mol m-3 NaCl) or under normal conditions and were compared growth and leaf ionic composition. NaCl salinity significantly decreased shoots as well as root growth of all the cotton genotypes. The concentration of Na+ and CI- were significantly increased in the leave of plants grown under salinity whereas the K+: Na+ ratio was decreased. Cultivars differed significantly for both growth and ionic composition. Genotype CIM-446 performed better under salinity and was categorized as a relatively salt-tolerant genotype. The order of the salinity tolerance of the cotton genotypes is CIM-446 greater than NIAB-98 greater than NIAB-999 greater than Krishma. The tolerant genotype CIM-446 accumulated lower Na+ and CI- in its leaves and maintained higher K+: Na+ ratio.
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