Effects of chilling stress on the accumulation of soluble sugars and their key enzymes in Jatropha curcas seedlings

Physiology and Molecular Biology of Plants : an International Journal of Functional Plant Biology
Haibo WangChao Liu

Abstract

As osmolytes and signaling molecules, soluble sugars participate in the response and adaptation of plants to environmental stresses. In the present study, we measured the effect of chilling (12 °C) stress on the contents of eight soluble sugars in the leaves, cotyledons, stems, and roots of Jatropha curcas seedlings, as well as on the activities of eight rate-limiting enzymes that are critical to the metabolism of those soluble sugars. Chilling stress promoted both starch hydrolysis and soluble sugar accumulation. The soluble sugar contents of the leaves and cotyledons were affected more than that of the stems and roots. Meanwhile, the activities of the corresponding metabolic enzymes (e.g., β-amylase, uridine diphosphate glucose phosphorylase, and sucrose phosphate synthase) also increased in some organs. The gradual increase of soluble neutral alkaline invertase activity in the four studied organs suggested that sucrose catabolic production, such as glucose and fructose, was especially important in determining resistance to chilling stress and hexose signal transduction pathway. In addition, the substantial accumulation of raffinose family oligosaccharides and increase in corresponding metabolic enzyme activity suggested that...Continue Reading

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Citations

Jun 1, 2021·ACS Omega·Zhihao LiangShiwei Song

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Methods Mentioned

BETA
light scattering
enzyme-linked immunosorbent assay

Software Mentioned

SPSS
Sigma Plot

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