Abstract
Finding methods, which may improve wheat (Triticum aestivum L.) growth and tolerance under drought stress, are of significance. The hypothesis was plant growth regulators (PGRs) are able to alter wheat physiology in a way so that the plant would be able to resist the stress. Accordingly, PGRs affecting wheat response in drought stress was investigated in greater details. Different PGRs, at different drought levels (80 (S1), 100- (S2) and 120-mm (S3) evaporation from pan class A) affecting wheat biochemical and nutritional properties including nutrient uptake (N, P, K) were tested. Experimental treatments including control (water, T1), and PGRs of gibberellic acid (GA3, 110 mgL−1, T2), salicylic acid (SA, 1.5 mM, T3), and benzyl adenine (60 mgL−1, T4), GA3 + SA (T5), as well as superoxide dismutase (SOD, 5 gL−1, T6) were tested in two different locations. Wheat biochemical and nutritional parameters including grain protein, chlorophyll a and b, leaf relative water at flowering and ripening, wet and dry gluten index, soluble sugars, and grain nutrient uptake were significantly enhanced by PGRs. The grain protein was in the range of 9.90 (S3T1) and 15.01% (S1T5); however, T5 treatment significantly enhanced it at the second (14.47%) and third (13.96%) level of drought. Although the single use of PGR was effective on the alleviation of stress, the combined use of GA3 + SA followed by the single use of SOD, were the most effective ones. Treating wheat plants with the tested PGRs is recommendable to improve wheat biochemical and nutritional properties in the arid and semi-arid areas.
Abstract
Finding methods, which may improve wheat (Triticum aestivum L.) growth and tolerance under drought stress, are of significance. The hypothesis was plant growth regulators (PGRs) are able to alter wheat physiology in a way so that the plant would be able to resist the stress. Accordingly, PGRs affecting wheat response in drought stress was investigated in greater details. Different PGRs, at different drought levels (80 (S1), 100- (S2) and 120-mm (S3) evaporation from pan class A) affecting wheat biochemical and nutritional properties including nutrient uptake (N, P, K) were tested. Experimental treatments including control (water, T1), and PGRs of gibberellic acid (GA3, 110 mgL−1, T2), salicylic acid (SA, 1.5 mM, T3), and benzyl adenine (60 mgL−1, T4), GA3 + SA (T5), as well as superoxide dismutase (SOD, 5 gL−1, T6) were tested in two different locations. Wheat biochemical and nutritional parameters including grain protein, chlorophyll a and b, leaf relative water at flowering and ripening, wet and dry gluten index, soluble sugars, and grain nutrient uptake were significantly enhanced by PGRs. The grain protein was in the range of 9.90 (S3T1) and 15.01% (S1T5); however, T5 treatment significantly enhanced it at the second (14.47%) and third (13.96%) level of drought. Although the single use of PGR was effective on the alleviation of stress, the combined use of GA3 + SA followed by the single use of SOD, were the most effective ones. Treating wheat plants with the tested PGRs is recommendable to improve wheat biochemical and nutritional properties in the arid and semi-arid areas. Leer más
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