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Ethephon Increases Rubber Tree Latex Yield by Regulating Aquaporins and Alleviating the Tapping-Induced Local Increase in Latex Total Solid Content

文献类型： 外文期刊

作者： An, Feng 1 ; Rookes, James 3 ; Xie, Guishui 1 ; Cahill, David 3 ; Cai, Xiuqing 4 ; Zou, Zhi 1 ; Kong, Lingxue 2 ;

作者机构： 1.Chinese Acad Trop Agr Sci, Rubber Res Inst, Minist Agr, Danzhou Invest & Expt Stn Trop Crops, Danzhou 571737, Hainan, Peoples R China

2.Deakin Univ, Inst Frontier Mat, Geelong, Vic 3220, Australia

3.Deakin Univ, Ctr Chem & Biotechnol, Sch Life & Environm Sci, Waurn Ponds Campus, Geelong, Vic 3220, Australia

4.Hainan Univ, Coll Agron, Haikou 570228, Hainan, Peoples R China

关键词： Hevea brasiliensis;Latex;Total solid content;Ethephon;Aquaporin

期刊名称：JOURNAL OF PLANT GROWTH REGULATION （ 影响因子：4.169； 五年影响因子：4.038 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： The concentration of phloem solute generally falls from leaves to roots. However, a local increase in latex total solid content (LILTSC) was identified near the tapping cut of rubber trees. To understand the mechanism of ethephon-stimulated latex yield, the formation and ethephon (an ethylene releaser) alleviation of the LILTSC near the tapping cut were examined. It was found that the LILTSC near the tapping cut of a tapped rubber tree was caused by the tapping-accelerated rubber biosynthesis which began following the first tapping and became significant after the fourth tapping. Ethephon stimulation markedly reduced the LILTSC. The latex yield change pattern upon ethephon stimulation was associated with the kinetic change of LILTSC and the decomposition dynamic of ethephon into ethylene. Once the LILTSC was reduced by ethylene release upon ethephon stimulation, the latex yield increased; however, when the ethylene release upon ethephon stimulation receded, the LILTSC was restored and the effect of ethephon stimulation dissipated. The reduction of LILTSC by ethephon stimulation could be ascribed to the translocation property of ethylene in plants and its regulation of aquaporins. Because maximum ethylene release upon tapping-cut-ethephon-application occured close to the tapping cut, the aquaporins were more up-regulated in this region, leading to a reduction of the LILTSC and an increase in latex yield. All these results suggest that the LILTSC near the tapping cut was caused by tapping; the ethephon-induced aquaporin up-regulation and LILTSC reduction are involved in the mechanism of ethephon-promoted latex yield.

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