Effect of low temperature on phytohormones and carbohydrates metabolism in Bermuda grass

doi:10.11686/cyxb2015133

Abstract

Abstract: To investigate the effects of modulated cold acclimation on the leaf membrane stability, chlorophyll content, endogenous hormones (ABA, IAA, GA₃, tZR), and carbohydrate (soluble sugars, starch, fructan, total nonstructural carbohydrates) metabolism, five Bermuda grass cultivars, Tifway, Tifgreen, Tifsport, Tifeagle and Baoding were selected and treated under a range of temperatures: optimum (30℃/25℃), suboptimum (18℃/12℃), chilling (8℃/4℃) and freezing (4℃/-4℃) in growth chambers. The results demonstrated that leaf electrolyte leakage, abscisic acid (ABA) content and carbohydrates (soluble sugars, starch, fructan, total nonstructural carbohydrates) increased while chlorophyll content, endogenous hormones auxin (IAA), gibberellin (GA₃) and cytokinin (tZR) content decreased with low temperature stress, but the changes varied with cultivar. Tifeagle, Tifsport and Tifgreen were ranked highest, Tifway was ranked intermediate while Baoding ranked lowest. Accumulating or maintaining relatively higher levels of phytohormones and carbohydrates, associated with cellular osmotic homeostasis and membrane stability, delayed leaf senescence. Cold resistance genes or protein induction may contribute to the higher cold tolerance in Bermuda grass under low temperature.

YANG Yong, LOU Yan-Hong, YANG Zhi-Jian, XIANG Zuo-Xiang, XU Qing-Guo, HU Long-Xing. Effect of low temperature on phytohormones and carbohydrates metabolism in Bermuda grass[J]. Acta Prataculturae Sinica, 2016, 25(2): 205-215.

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