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Effect of salicylic and abscisic acid administered through detached tillers on antioxidant system in developing wheat grains under heat stress

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Abstract

The mechanism imparting thermotolerance by salicylic acid (SA) and abscisic acid (ABA) is still unresolved using either spraying technique or in vitro conditions. Alternative way of studying these effects under near in vivo conditions is through the use of liquid culturing technique. Effects of SA and ABA (100 μM) on antioxidative enzymes, antioxidants and lipid peroxidation were studied in detached tillers of three wheat (Triticum aestivum L.) cultivars PBW 343, C 306 (heat tolerant) and WH 542 (heat susceptible) cultured in a liquid medium. Ears were subjected to heat shock treatment (45°C for 2 h) and then maintained at 25°C for 5 days. Heat shock treatment resulted in increased peroxidase (POD) activity, while superoxide dismutase (SOD) and catalase (CAT) activities were reduced compared to control. The decrease in CAT activity was more significant in susceptible cultivar WH 542. Concomitantly, content of α-tocopherol and lipid peroxides increased in heat-treated wheat ears, whereas contents of total ascorbate level were reduced. Following treatment with SA and ABA, activities of all three antioxidative enzymes increased in correspondence with an increase in ascorbate and α-tocopherol content. Apparently, lipid peroxide content was reduced by SA in heat tolerant cultivars (PBW 343 and C 306) whereas in susceptible cultivar it was decreased by ABA. The up-regulation of the antioxidant system by SA and ABA possibly contributes to better tolerance against heat shock-induced oxidative damage in wheat grains.

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Authors and Affiliations

  1. Department of Biochemistry, Punjab Agricultural University, Ludhiana, 141004, Punjab, India

    Bavita Asthir & Satvir Kaur

  2. Department of Plant Pathology, Punjab Agricultural University, Ludhiana, 141004, Punjab, India

    Satwinder K. Mann

Authors
  1. Bavita Asthir
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  2. Satvir Kaur
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  3. Satwinder K. Mann
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Correspondence to Bavita Asthir.

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Communicated by S. Weidner.

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Asthir, B., Kaur, S. & Mann, S.K. Effect of salicylic and abscisic acid administered through detached tillers on antioxidant system in developing wheat grains under heat stress. Acta Physiol Plant 31, 1091–1096 (2009). https://doi.org/10.1007/s11738-009-0335-y

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  • DOI: https://doi.org/10.1007/s11738-009-0335-y

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