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Mechanical wounding-induced laticifer differentiation in rubber tree: An indicative role of dehydration, hydrogen peroxide, and jasmonates

文献类型： 外文期刊

作者： Tian, Wei-Min 1 ; Yang, Shu-Guang 1 ; Shi, Min-Jing 1 ; Zhang, Shi-Xin 1 ; Wu, Ji-Lin 1 ;

作者机构： 1.Chinese Acad Trop Agr Sci, Key Lab Biol & Genet Resources Rubber Tree, State Key Lab Breeding Base Cultivat & Physiol Tr, Minist Agr,Rubber Res Inst, Danzhou 571737, Hainan, Peoples R China

关键词： Hevea brasiliensis Muell. Arg.;Dehydration;Laticifer differentiation;Hydrogen peroxide;Jasmonates;Vascular cambia

期刊名称：JOURNAL OF PLANT PHYSIOLOGY （ 影响因子：3.549； 五年影响因子：4.164 ）

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收录情况： SCI

摘要： The secondary laticifer in the secondary phloem of rubber tree are a specific tissue differentiating from vascular cambia. The number of the secondary laticifers is closely related to the rubber productivity of Hevea. Factors involved in the mechanical wounding-induced laticifer differentiation were analyzed by using paraffin section, gas chromatography-mass spectrometry (GC-MS), and Northern-blot techniques. Dehydration of the wounded bark tissues triggered a burst of hydrogen peroxide, abscisic acid, and jasmonates and up-regulated the expression of HbAOSa, which was associated with the secondary laticifer differentiation strictly limited to the wounded area. Application of exogenous hydrogen peroxide, methyl jasmonate, and polyethylene glycol 6000 (PEG6000) could induce the secondary laticifer differentiation, respectively. Moreover, 6-Benzylaminopurine, a synthetic cytokinin, enhanced the methyl jasmonate-induced secondary laticifer differentiation. However, the dehydration-induced secondary laticifer differentiation was inhibited by exogenous abscisic acid. Diphenyleneiodonium chloride (DPI), a specific inhibitor of NADPH oxidase, was effective in inhibiting the accumulation of hydrogen peroxide as well as of jasmonates upon dehydration. It blocked the dehydration-induced but not the methyl jasmonate-induced secondary laticifer differentiation. The results suggested a stress signal pathway mediating the wound-induced secondary laticifer differentiation in rubber tree. (C) 2015 Elsevier GmbH. All rights reserved.

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