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Involvement of HbMC1-mediated cell death in tapping panel dryness of rubber tree (Hevea brasiliensis)

文献类型： 外文期刊

作者： Liu, Hui 1 ; Wei, Yongxuan 1 ; Deng, Zhi 1 ; Yang, Hong 1 ; Dai, Longjun 1 ; Li, Dejun 1 ;

作者机构： 1.Chinese Acad Trop Agr Sci, Hainan Prov Key Lab Trop Crops Cultivat & Physiol, Key Lab Biol & Genet Resources Rubber Tree, Rubber Res Inst,Minist Agr & Rural Affairs, Danzhou 571737, Peoples R China

2.Hainan Univ, Inst Trop Agr & Forestry, Haikou 570028, Hainan, Peoples R China

关键词： metacaspase; oxidative stress; programmed cell death; rubber tree; tapping panel dryness; yeast two-hybrid assay

期刊名称：TREE PHYSIOLOGY （ 影响因子：4.196； 五年影响因子：4.727 ）

ISSN： 0829-318X

年卷期： 2019 年 39 卷 3 期

页码：

收录情况： SCI

摘要： Tapping panel dryness (TPD) causes a significant reduction in the latex yield of rubber tree (Hevea brasiliensis Muell. Arg.). It is reported that TPD is a typical programmed cell death (PCD) process. Although PCD plays a vital role in TPD occurrence, there is a lack of detailed and systematic study. Metacaspases are key regulators of diverse PCD in plants. Based on our previous result that HbMC1 was associated with TPD, we further elucidate the roles of HbMC1 on rubber tree TPD in this study. HbMC1 was up-regulated by TPD-inducing factors including wounding, ethephon and H2O2. Moreover, the expression level of HbMC1 was increased along with TPD severity in rubber tree, suggesting a positive correlation between HbMC1 expression and TPD severity. To investigate its biological function, HbMC1 was overexpressed in yeast (Saccharomyces cerevisiae) and tobacco (Nicotiana benthamiana). Transgenic yeast and tobacco overexpressing HbMC1 showed growth retardation compared with controls under H2O2-induced oxidative stress. In addition, overexpression of HbMC1 in yeast and tobacco reduced cell survival after high-concentration H2O2 treatment and resulted in enhanced H2O2-induced leaf cell death, respectively. A total of 11 proteins, rbcL, TM9SF2-like, COX3, ATP9, DRP, HbREF/Hevb1, MSSP2-like, SRC2, GATL8, CIPK14-like and STK, were identified and confirmed to interact with HbMC1 by yeast two-hybrid screening and co-transformation in yeast. The 11 proteins mentioned above are associated with many biological processes, including rubber biosynthesis, stress response, autophagy, carbohydrate metabolism, signal transduction, etc. Taken together, our results suggest that HbMC1-mediated PCD plays an important role in rubber tree TPD, and the identified HbMC1-interacting proteins provide valuable information for further understanding the molecular mechanism of HbMC1-mediated TPD in rubber tree.

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