PJB-2023-1562
Silicic acid and glutathione application improves elevated ozone toxicity tolerance by modulating biomass, senescence, seed quality attributes and oxidative stress indicators in sesame (Sesamum indicum L.)
Faryad Ali, Muhammad Nawaz, Muhammad Anwar and Naeem Iqbal
Abstract
Ever rising ozone (O3) is considered as a major threat for crop production in many areas of the world including Pakistan. The present study describes the role of glutathione (0.1 mM) and silicic acid (0.1 mM) for ameliorating the toxic effects of elevated O3 in Sesame. Four newly released sesame lines, MYT-3, MYT-2, MYT-8, and 1500-I were used in this study as split-split plot design with four replications under ambient (~40 ppb) and elevated (~120 ppb) O3 treatments. Elevated O3 toxic effects were recovered through foliar treatment of silicic acid and glutathione via decreased leaf senescence especially at grain filling period, increased chlorophyll pigments (except chl b), increased enzymatic and non-enzymatic antioxidants in addition to decreased MDA and H2O2. Moreover, the yield attributes were also influenced positively. Negative effects of O3 on seed oil and protein were reversed with applications but decrease in seed fibre and moisture was not recovered. It is revealed from current findings that silicic acid foliar supplementation is more effective for O3 toxicity amelioration as compared to glutathione application. Sesame line, MYT-3 produced highest yield under the hazardous O3 treatment via reducing leaf senescence at grain filling period increasing total chlorophyll, carotenoid contents, SOD and POD, decline in MDA, rise in harvest index and seed oil to prove O3 tolerant line. This tolerant sesame line could be incorporated in variety development program and subjected to molecular characterization to understand the O3 stress tolerance mechanism at molecular level in future.
To Cite this article:
Ali, F., M. Nawaz, M. Anwar and N. Iqbal. 2023. Silicic acid and glutathione application improves elevated ozone toxicity tolerance by modulating biomass, senescence, seed quality attributes and oxidative stress indicators in sesame (Sesamum indicum L.). Pak. J. Bot., 55(5): DOI: http://dx.doi.org/10.30848/PJB2023-5(42)
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