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γ-Aminobutyric Acid (GABA) Imparts Partial Protection from Heat Stress Injury to Rice Seedlings by Improving Leaf Turgor and Upregulating Osmoprotectants and Antioxidants

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Abstract

Four-day-old rice (Oryza sativa L.) seedlings were subjected to varying temperatures of 30/20, 35/25, and 42/37 °C [light/dark (15/9 h); light intensity: 350 μmol m−2 s−1, RH 65–70 %] in glass Petri dishes for 10 days in the absence (control) or the presence of γ-aminobutyric acid (GABA) 1 mM under the controlled conditions of a growth chamber. With rise in temperature, the length of both shoots and roots was inhibited severely and there was a marked decrease in survival, especially at 42/37 °C. Endogenous GABA content increased more than twofold in moderately stressed (MS) 35/25 °C plants, whereas it decreased sevenfold in severely stressed (SS) 42/37 °C plants compared to MS plants, and this decrease was associated with marked reduction in growth and survival. Exogenous application of GABA to the heat-stressed plants significantly improved growth as well as survival. It was linked to reduction in damage to membranes, improvement in cellular reducing ability, chlorophyll content, and photochemical efficiency in shoots. Relative leaf water content and stomatal conductance were also improved with the application of GABA and their improvement was related to increased accumulation of the osmolytes proline and trehalose. In the presence of GABA, the shoots suffered less oxidative damage in terms of malondialdehyde and hydrogen peroxide contents. The activities of enzymatic antioxidants such as superoxide dismutase, catalase, ascorbate peroxidase, and glutathione reductase were severely inhibited in plants growing at 42/37 °C compared to those growing at 35/25 °C. The nonenzymatic antioxidants like ascorbate and glutathione followed a similar pattern. GABA-treated SS plants showed enhanced levels of enzymatic and nonenzymatic antioxidants compared to untreated controls. Thus, GABA appears to impart partial protection from heat stress to rice plants by elevating leaf turgor due to increased accumulation of osmolytes and reduction of oxidative damage by stimulation of antioxidants. These findings provided evidence about the involvement of GABA in governing heat sensitivity in rice.

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Authors and Affiliations

  1. Department of Botany, Panjab University, Chandigarh, 160 014, India

    Harsh Nayyar, Ramanpreet Kaur & Simranjit Kaur

  2. Department of Plant Breeding, P.A.U, Ludhiana, 141 001, India

    R. Singh

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  1. Harsh Nayyar
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  2. Ramanpreet Kaur
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Correspondence to Harsh Nayyar.

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Nayyar, H., Kaur, R., Kaur, S. et al. γ-Aminobutyric Acid (GABA) Imparts Partial Protection from Heat Stress Injury to Rice Seedlings by Improving Leaf Turgor and Upregulating Osmoprotectants and Antioxidants. J Plant Growth Regul 33, 408–419 (2014). https://doi.org/10.1007/s00344-013-9389-6

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