Evaluating the response of two high yielding Indian rice cultivars against ambient and elevated levels of ozone by using open top chambers

摘要

A continuous increase in the background level of tropospheric ozone (O_3) 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 O_3 on two cultivars of Indian rice (Oryza saliva 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 O_3. Photosynthetic rate, stomatal conductance and photosynthetic efficiency (F_v/F_m) were also reduced by O_3 with more drastic effects under elevated levels of O_3. Leaf proteome showed reduction of some major proteins due to O_3. Pollen viability, viable florets plant~(-1) and economic yield also showed significant negative impact under O_3-exposure in both the test cultivars. The experimental findings depict that both the cultivars of rice demonstrate differential response against O_3, and it may help the plant breeders in selection of resistant cultivars for the area having higher concentrations of O_3.