Morpho-Physiological, biochemical and developmental responses of diploid cotton ( Gossypium arboreum L.) cultivars under varying NaCl stress

摘要

Salinity is one of the severe environmental factors limiting cotton productivity. The present study aimed toinvestigate the salt stress response of diploid cotton (Gossypium arboreum L.) cultivars commonly cultivated inthe region. The plant developmental, biochemical and physiological responses of desi cotton varieties FDH 171and FDH 786 under NaCl stress (100, 150 and 200 mM) were evaluated. Root and shoot length and seedlingvigor were reduced, but root: shoot was gradually increased as the plants were subjected to increased stress ofNaCl. Leaf relative water content and turgor potential were reduced when the NaCl stress was increasedgradually. Decrease in osmotic and water potential imposed and maintained the physiological mechanism of theplants. Biochemical processes, including chlorophyll content, proline and soluble sugars under salt stress justifythe reduction of cellular osmotic potential. Consequently, the genotypes FDH 171 & FDH 786 were suitablyadapted under NaCl stress. These genotypes can be an excellent source for breeding and cotton improvementprogram for salinity tolerance.