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Plant hormone signals regulate trehalose accumulation against osmotic stress in watermelon cells

文献类型： 外文期刊

作者： Zhu, Fangming 1 ; Li, Mingyan 1 ; Sun, Mengli 1 ; Jiang, Xuefei 1 ; Qiao, Fei 2 ;

作者机构： 1.Hainan Univ HNU, Coll Hort, Key Lab Qual Regulat Trop Hort Plants Hainan Prov, Key Lab Trop Agritourism Greenhouse Haikou, Haikou 570228, Hainan, Peoples R China

2.Chinese Acad Trop Agr Sci, Trop Crops Genet Resources Inst, Key Lab Crop Gene Resources & Germplasm Enhanceme, Minist Agr, Danzhou 571737, Peoples R China

关键词： Citrullus lanatus; Trehalose; Osmotic stress; Plant hormone; Gene expression; ELSD-HPLC

期刊名称：PROTOPLASMA （ 影响因子：3.186； 五年影响因子：3.447 ）

ISSN： 0033-183X

年卷期：

页码：

收录情况： SCI

摘要： Trehalose, one of the most chemically stable sugars, can effectively improve the tolerance of various plants against abiotic stress by protecting and stabilizing protein and cell membranes. However, the signaling pathway in trehalose biosynthesis triggered by abiotic stresses is still unclear. In the study, it can be shown that exogenous trehalose can alleviate the inhibitory effect of osmotic stress on cell growth, suppress extracellular alkalization, ROS burst, and maintain the integrity of the microtubular cytoskeleton. Trehalose-6-phosphate synthase (TPS) is the key limiting enzyme for trehalose synthesis and is encoded by 7 ClTPS genes, located in 7 different chromosomes of the watermelon genome. Expression analysis by qRT-PCR indicated that osmotic stress could upregulate the expression of all the family members of ClTPS and promote the accumulation of trehalose in watermelon cells accordingly. Exogenous methyl jasmonate (MeJA), ethephon (ETH), abscisic acid (ABA), or salicylic acid (SA) induced trehalose accumulation, with MeJA being the most effective treatment. When fluridone (FL), an ABA biosynthesis inhibitor, was pre-perfused into the cells before osmotic stress, trehalose accumulation and packed cell volume were suppressed significantly, whereas inhibition of ethylene biosynthesis could even restore cell growth. Moreover, inhibition of trehalose hydrolysis could also increase the tolerance against osmotic stress. This study shows that trehalose biosynthesis is phytohormone-dependent and the hydrolysis of trehalose is involved in osmotic tolerance regulation.

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