Abstract:
Oxidative stress is one of the most important consequences of drought stress in plants. Both enzymatic and non-enzymatic antioxidant systems are responsible to decrease oxidative injury in plant tissues. Fifteen different genotypes were sown in polythene bags (30 cm × 15 cm) following complete randomized design with three replications under normal and water stress conditions. After 45 days from sowing drought stress was induced by with holding irrigation for seven days. Normal regime was irrigated regularly. Simultaneous determination of chlorophylls, carotenoids and polyphenols were carried out to investigate the responses of cotton accessions to drought. As drought tolerant varieties have maximum amount of carotenoids and polyphenols and vice versa for susceptible varieties. We found that in cotton accessions, FH-113, PB-899 and MNH-789 had maximum amount of carotenoids (mg/100 mL) (0.79), (0.69) and (0.66) and polyphenols (µg/g of leaf) (0.014), (0.012) and (0.011) under normal conditions, respectively. CIM-506, FH-901 and CRIS-466 had minimum amount of carotenoids (0.29), (0.34) and (0.39) and polyphenols (0.005), (0.006) and (0.007) under normal conditions, respectively. Therefore, cotton accessions FH-113, PB-899 and MNH-789 were found drought tolerant and CIM-506, FH-901 and CRIS-466 were found drought susceptible. Chlorophyll a and b and carotenoids were decreased and polyphenols were increased under water stress conditions in all the accessions. Tolerant accessions have good antioxidant defense system, which protects from drought, should be selected for further breeding programme.
Page(s):
903-908
DOI:
DOI not available
Published:
Journal: International Journal of Agriculture and Biology, Volume: 13, Issue: 6, Year: 2011