PJB-2026-74
EXOGENOUS APPLICATION OF ELICITORS IMPROVE GROWTH, PRODUCTION AND OIL QUALITY IN SUNFLOWER PLANTS UNDER ABIOTIC STRESS CONDITIONS
Iqra Mustafa
Abstract
Plants acclimatize themselves to different abiotic stress by altering physico-chemical process as well as by involving both internal and external elicitors such as phytohormones. Therefore, current study was designed to investigate the optimal application and dose of different elicitors enhancing the growth, productivity and oil quality of sunflower plants. A wire house study was conducted to determine a suitable elicitor among four applied under different treatments including negative control (distilled water), positive control (Gibberellic acid (GA) @ 0.1 g/L), brassinosteroids (BRs) @ 50 nano g/L and jasmonic acid (JA) @ 0.021 g/L, to mitigate stresses in sunflower hybrids (Hysun-33, H-5264 and UOS-4). Negative control application showed provoked (P≤0.05) decreases in growth, yield, oil and physiological components; the percentages of decrease in leaf area 18.90%, dry matter accumulation 22.29%, plant height 38.79%, number of achene per capitulum 16.78%, 100-achene weight 44.88%, achene yield 65.16%, dehulling 29.51%, via decreasing chlorophyll content 18.11% and oil content 8.89%, linoleic acid 34.80%, palmitic acid 3.27%, stearic acid 21.72% and alpha tocopherol 28.44% while elevating peroxidase value 44.04% and oleic acid 43.49% than BRs @ 50 nano g/L. BRs @ 50 nano g/L and JA @ 0.021 g/L showed a simulative result on growth and production of sunflower through strengthening chlorophyll content, physiological traits and enzymatic antioxidant (peroxidase), thus, improving oil quality. Leaf area, dry matter accumulation, plant height and linoleic acid were significantly (P≤0.05) improved in Hysun-33 compared to H-5264 and UOS-4. While chlorophyll content, achene per capitulum, 100-achene weight and production, dehulling, oil traits, peroxidase and alpha tocopherol were recorded higher in UOS-4 (P≤0.05) compared to H-5264 and Hysun-33. In conclusion, BRs @ 50 nano g/L has been found as suitable for bringing improvement in sunflower hybrid UOS-4 growth, yield, oil quality, antioxidant enzymes and physiological traits. Our study suggested that BRs and JA at appropriate rates can successfully mitigate abiotic stress on sunflower hybrids.
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