Evaluating the response of two high yielding Indian rice cultivars against ambient and elevated levels of ozone by using open top chambers
2012
Sarkar, Abhijit | Agrawal, S.B.
A continuous increase in the background level of tropospheric ozone (O₃) has become a major challenge for present and future agricultural productivity at worldwide. Present study was designed to assess the impact of ambient (present) and elevated (future) concentrations of O₃ on two cultivars of Indian rice (Oryza sativa L. cvs Malviya dhan 36 and Shivani). Shoot and root lengths, number of leaves and total leaf area were severely affected by both ambient and elevated concentrations of O₃. Photosynthetic rate, stomatal conductance and photosynthetic efficiency (Fᵥ/Fₘ) were also reduced by O₃ with more drastic effects under elevated levels of O₃. Leaf proteome showed reduction of some major proteins due to O₃. Pollen viability, viable florets plant⁻¹ and economic yield also showed significant negative impact under O₃-exposure in both the test cultivars. The experimental findings depict that both the cultivars of rice demonstrate differential response against O₃, and it may help the plant breeders in selection of resistant cultivars for the area having higher concentrations of O₃.
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