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

棉子糖 蔗糖合成酶 转化酶 生物化学 蔗糖 果糖 海藻糖 蔗糖磷酸合酶 植物生理学 渗透压 代谢途径 化学 渗透调节剂 生物 植物 脯氨酸 氨基酸
作者
Haibo Wang,Ming Gong,Xin Hu,Lizhou Tang,Dong-Qin Dai,Yong Gao,Chao Liu
出处
期刊:Physiology and Molecular Biology of Plants [Springer Nature]
卷期号:24 (5): 857-865 被引量:38
标识
DOI:10.1007/s12298-018-0568-6
摘要

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 galactinol and raffinose play an important role in determining the chilling resistance of J. curcas. Together, these findings establish a foundation for determining the relationship between the chilling resistance and soluble sugar accumulation of J. curcas and for investigating the mechanisms underlying sugar signaling transduction and stress responses.
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