Volume 16, No. 7, July 2016, Pages 1742-1756 PDF(1.78 MB)
Chemical and Natural Plant Extract in Ameliorating Negative Impact of Tropospheric Ozone on Wheat Crop: A Case Study in a Part of Semiarid North West India
Amrita Daripa1, Arti Bhatia1, Sankalpa Ojha2, Ritu Tomer1, Sudipta Chattaraj3, Kanwar P. Singh4, Shiv D. Singh1
1 Centre for Environment Science and Climate Resilient Agriculture, Indian Agricultural Research Institute (IARI), New Delhi 110012, India
2 Indian Agricultural Statistical Research Institute (IASRI), New Delhi 110012, India
3 National Bureau of Soil Survey & Land Use Planning, Nagpur 440033, India
4 Division of Floriculture & Landscaping, Indian Agricultural Research Institute (IARI), New Delhi 110012, India
- Chemical and natural plant extracts minimized impact of elevated O3 on wheat growth.
- Antioxidant chemicals increased the endogenous ascorbic acid concentration in plant.
- Grain yield, HI and nutritional quality increased on application of antioxidants.
Current rise in concentration of tropospheric ozone (O3) has deleterious effect on growth and yield of crops. Wheat is one of the most O3 sensitive crops. Application of Chemical antioxidants may be beneficial to lessen the harmful effects of O3 on crops. A two year study growing wheat (variety PBW550) was carried at the farms of Indian Agricultural Research Institute, New Delhi in 2010–11 and 2011–12 to evaluate the efficacy of some natural and environment friendly antioxidant chemicals in ameliorating the negative impacts of elevated ozone on growth and productivity of wheat. The treatments were i) charcoal filtered air (CF) ii) 1% ascorbic acid (AA), iii) 100 ppm quercetin (Q), iv) 10% marigold leaves extract (Tagetes patula var pusa arpita) (T) and v) elevated O3 control (C). Additional 25–35 ppb of O3 over the ambient levels was maintained in all open top chambers except the CF treatment. The seasonal daily average O3 concentration in ambient air was 38 ppb in 2010–11 and 29 ppb in 2011–12 during the crop growth period. The exogenous application of antioxidants increased the levels of endogenous leaf ascorbic acid. The activity of antioxidant enzymes (superoxide dismutase, catalase and peroxidase) was lowered by 5 to 34% in antioxidants sprayed plants as compared to elevated O3 control (C). The application of antioxidants increased the yield of wheat by 23–26% in AA, 13–15% in Q and 8–10% in T as compared to C. The micronutrient (Cu, Fe, Zn and Mn) content of wheat grains on application of exogenous ascorbic acid was higher. The application of antioxidant chemicals was effective in alleviating the negative impacts of elevated O3 on enzyme activity and nutritional quality of wheat which increased the growth and yield of the crop.
Tropospheric ozone; Wheat; Antioxidant; Ascorbic acid; Stress enzyme.