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

An, Feng, Cai, Xiuqing, Rookes, James, Xie, Guishui, Zou, Zhi, Cahill, David and Kong, Lingxue 2015, Latex dilution reaction during the tapping flow course of Hevea brasiliensis and the effect of Ethrel stimulation, Brazilian journal of botany, vol. 38, no. 2, pp. 211-221, doi: 10.1007/s40415-014-0125-7.

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Title Latex dilution reaction during the tapping flow course of Hevea brasiliensis and the effect of Ethrel stimulation
Author(s) An, Feng
Cai, Xiuqing
Rookes, JamesORCID iD for Rookes, James orcid.org/0000-0003-1479-2339
Xie, Guishui
Zou, Zhi
Cahill, DavidORCID iD for Cahill, David orcid.org/0000-0002-2556-0528
Kong, LingxueORCID iD for Kong, Lingxue orcid.org/0000-0001-6219-3897
Journal name Brazilian journal of botany
Volume number 38
Issue number 2
Start page 211
End page 221
Total pages 11
Publisher Springer
Place of publication New York, N. Y.
Publication date 2015-06-19
ISSN 0100-8404
1806-9959
Keyword(s) Aquaporins
Latex dilution
Osmoregulation
Osmotic potential
Phloem turgor pressure
Tapping latex flow
Summary 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 tapping-induced 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.
Language eng
DOI 10.1007/s40415-014-0125-7
Field of Research 060705 Plant Physiology
060702 Plant Cell and Molecular Biology
Socio Economic Objective 820102 Harvesting and Transport of Forest Products
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, Springer
Persistent URL http://hdl.handle.net/10536/DRO/DU:30072456

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