Exogenous Abscisic Acid Increases Carbohydrate Accumulation and Redistribution to the Grains in Wheat Grown Under Field Conditions of Soil Water Restriction

ABA Increased Soybean Yield by Enhancing Production of Carbohydrates and Their Allocation in Seed

“…This effect of ABA has also been seen in studies carried out under controlled conditions with different levels of water deficit, both in Arabidopsis (Finkelstein & Rock 2002) and Ilex paraguariensis (Sansberro et al, 2004), where the plants sprayed with ABA had greater growth than those with lower (endogenous) levels of ABA. In agreement with our previous findings (Travaglia et al, 2007 and, these new results suggest that ABA is an important regulator of cell and whole-plant water content, likely due to an increased turgor that allows optimal cellular expansion (Acevedo et al, 1971). ABA-treated soybean plants also improved leaf area, which can be considered useful since it benefits the interception of light, particularly in short cycle varieties that sometimes do not cover the soil surface until late in the cycle (Andrade & Calviño, 2004).…”

“…For the cultivar and the dose used, no restrain of shoot growth was observed as had been previously reported (Sloger & Caldwell, 1970). These results coincide with those found in field-grown wheat plants under water stress that had been treated with ABA, in which these plants showed higher shoot biomass accumulation (Travaglia et al, 2007 and. This effect of ABA has also been seen in studies carried out under controlled conditions with different levels of water deficit, both in Arabidopsis (Finkelstein & Rock 2002) and Ilex paraguariensis (Sansberro et al, 2004), where the plants sprayed with ABA had greater growth than those with lower (endogenous) levels of ABA.…”

“…ABA would act protecting the membranes, especially those of chloroplasts, when they are under stress (Travaglia, 2008). These authors also reported higher carotene levels in ABA-treated plants, an effect that was also observed in wheat (Travaglia et al, 2007 and, but not in soybean. Although in this investigation the soybean plants were not under a long water deficit, they would suffer temporary water stress during hours of high light intensity where there is an unbalance between transpiration and water absorption; the ABA-treated plants showed higher chlorophyll levels and maintained green leaves longer.…”

“…ABA is also able to activate metabolization of carbohydrates temporally stored in the stem of rice (Yang et al, 2003) and wheat (Travaglia et al, 2007 and plants. As well, ABA applications lead to the accumulation of carbohydrates in grains consequently accelerating the filling process.…”

Physiology and transcriptomics of water-deficit stress responses in wheat cultivars TAM 111 and TAM 112

“…6). ABA application has also been shown to increase carbohydrate accumulation and remobilization to the grain in wheat, rice, and barley (Seiler et al, 2011;Tang et al, 2009;Travaglia et al, 2007;Yang and Zhang, 2006). Thus, elevated ABA might cause a reduction in photosynthesis, but could also provide a means for maintaining grain yield.…”