Journal
ENVIRONMENTAL MONITORING AND ASSESSMENT
Volume 185, Issue 9, Pages 7793-7807Publisher
SPRINGER
DOI: 10.1007/s10661-013-3136-0
Keywords
Cultivar; Vigna radiata L.; Ozone sensitivity; Leaf injury; Photosynthesis; Fluorescence
Categories
Funding
- University Grants Commission
- Council of Scientific and Industrial Research, Government of India, New Delhi
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Six Indian cultivars of Vigna radiata L. (HUM-1, HUM-2, HUM-6, HUM-23, HUM-24 and HUM-26) were exposed with ambient and elevated (ambient + 10 ppb ozone (O-3) for 6 h day(-1)) level of O-3 in open top chambers. Ozone sensitivity was assessed by recording the magnitude of foliar visible injury and changes in various physiological parameters. All the six cultivars showed visible foliar symptoms due to O-3, ranging 7.4 to 55.7 % injured leaf area. O-3 significantly depressed total chlorophyll, photosynthetic rate (Ps), quantum yield (F (v)/F (m)) and total biomass although the extent of variation was cultivar specific. Cultivar HUM-1 showed maximum reduction in Ps and stomatal conductance. The fluorescence parameters also indicated maximum damage to PSII reaction centres of HUM-1. Injury percentage, chlorophyll loss, Ps, F (v)/F (m) and total biomass reduced least in HUM-23 depicting highest O-3 resistance (R%).
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