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Calcium mitigates heat stress effect in wheat seeding growth by altering carbohydrate metabolism

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Abstract

Seedlings of three wheat cultivars viz. PBW 343, C 306 (heat tolerant) and WH 542 (heat susceptible) were subjected to a brief heat shock at 45 °C, followed by transfer to the normal temperature (25 °C) for three days in dark with and without Ca2+ (5 mM CaCl2). Heat shock treatment caused reduction in activities of enzymes, viz., soluble acid invertase, amylases and seedling growth with increase in total free sugar content. This effect was more pronounced in susceptible cv. WH 542 compared with tolerant cvs. PBW 343, C 306. With Ca2+ pretreatment a substantial increase in total sugars and reducing sugars as well as activities of both α and β amylases was observed in both control and stressed seedlings. Under normal temperature Ca2+ had non-significant effect on seedling growth and acid invertase activity, whereas, under stress conditions it improved the shoot and root length with enhancement in acid invertase activity. Thus, an appreciable level of thermo-protection was induced by 5 mM Ca2+ under stress conditions, indicating that Ca2+ level required for growth under heat stress exceeds that required for growth under normal conditions. Elevated Ca2+ concentration might be having a role in alleviating the inhibition of sucrose and starch metabolism, thereby, increasing their utilization for seedling growth under heat stress.

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Authors and Affiliations

  1. Department of Processing & Food Engineering, Punjab Agricultural University, Ludhiana, 141004, Punjab, India

    Surekha Bhatia

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

    Bavita Asthir

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  1. Surekha Bhatia
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  2. Bavita Asthir
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Correspondence to Surekha Bhatia.

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Bhatia, S., Asthir, B. Calcium mitigates heat stress effect in wheat seeding growth by altering carbohydrate metabolism. Ind J Plant Physiol. 19, 138–143 (2014). https://doi.org/10.1007/s40502-014-0087-6

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  • DOI: https://doi.org/10.1007/s40502-014-0087-6

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