Exogenous Abscisic Acid Increases Carbohydrate Accumulation and Redistribution to the Grains in Wheat Grown Under Field Conditions of Soil Water Restriction
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This work investigates the effects of abscisic acid (ABA) on physiologic parameters related to yield in wheat (Triticum aestivum) grown under field conditions with water restriction ranging between 45.7% and 49.5% of field capacity during anthesis and postanthesis. ABA (300 mg L−1) was sprayed onto the plants at the beginning of shoot lengthening which significantly promoted leaf area and higher concentrations of chlorophylls and carotenoids in flag leaf at anthesis. ABA also increased soluble carbohydrates in shoots at anthesis, which were then re-exported to the grains at maturity. This correlated with a yield increase that was achieved by a higher number and weight of grains per spike, but protein content was not significantly affected.
KeywordsAbscisic acid Carbohydrate accumulation Grain yield Water stress Wheat
C Travaglia is the recipient of a scholarship from CONICET (Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina). This work was funded by Fundación Antorchas and CONICET (R. Bottini) and by Secyt-UNRC (H. Reinoso). The experiments described in this article comply with the current laws of Argentina.
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