PJB-2019-355
Influence Aerial Application of Osmoprotectants: A Smart Tool to Ameliorate Salt Stress in Sunflower (Helianthus annuus L.)
Dr. Sibgha Noreen
Abstract
Application of osmoprotectants is being used to boost up crop growth and development especially under stressful environment. The experiment was aimed to assess the mitigating effect of aerial application of different osmoprotectants i.e salicylic acid (SA), ascorbic acid (AsA), proline (Pro) and their admixture (SA+AsA+Pro) @ 200mgL-1, in sunflower grown under saline (150mM NaCl) and control conditions, in a sandy pot culture. The results showed that salinity stress caused significant (p<0.05) reduction in biological yield by 50%, while it was improved by 80% under control. The chlorophyll-a, -b and total chlorophyll contents were decreased by 61.7%, 67.9% and 49% due to saline environment, however there were improved by 288.5%, 162.5% and 141.0% by spray of 200mgL-1 at vegetative growth. The quantity of H2O2 and MDA were elevated by 170.3% and 68.7%, respectively while enhanced by 54% and 47.4% under salt stress. The salt stress reduced K+ contents with concurrent increase in Na+ content with foliar application of proline (200mgL-1) at vegetative growth. The biological yield, physiological, and oxidative activity of sunflower would be improved by aerial application of proline at the rate of 200mgL-1 under 150mM NaCl saline environment.
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