Latex dilution reaction during the tapping flow course of Hevea brasiliensis and the effect of Ethrel stimulation

文献类型： 外文期刊

第一作者： An, Feng

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

作者机构：

关键词： Aquaporins;Latex dilution;Osmoregulation;Osmotic potential;Phloem turgor pressure;Tapping latex flow

期刊名称：BRAZILIAN JOURNAL OF BOTANY （ 影响因子：1.296； 五年影响因子：1.394 ）

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收录情况： SCI

摘要： The latex dilution reaction during the tapping flow course has been well documented and associated with the facilitation of tapping latex flow. However, its underlying mechanism has not experimentally examined. The latex total solid content, osmotic potential and phloem turgor pressure change during the tapping flow course were simultaneously measured to investigate the cause of water movement during the tapping flow course. It was found that there are three different stages for the laticifer water equilibrium during the tapping flow course. The tappinginduced rapid turgor pressure drop is the cause of the first stage water influx into laticifers, while osmoregulation prevails during water exchange in the second and third stages of tapping flow. Meanwhile, aquaporin expressions were, for the first time, investigated during the tapping flow course. The rapid transcript up-regulation of HbPIP1, HbPIP2; 1 and HbPIP2; 3 contributes to the latex dilution reaction. However, their activity gating cannot be ruled out. Ethrel stimulation can significantly dilute the corresponding latex fractions during the tapping flow course due to its up-regulations of HbPIP1, HbPIP2; 1 and HbPIP2; 3. Nevertheless, the latex dilution reaction pattern for the Ethrel treated trees did not change, except for a lower degree of dilution compared with the un-treated trees. All these results suggest that both phloem turgor pressure and aquaporins are involved in the latex dilution reaction during the tapping flow course.

分类号： Q94

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