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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

Feng, An, Rookes, James, Xie, Guishui, Cahill, David, Cai, Xiuqing, Zou, Zhi and Kong, Lingxue 2016, Ethephon increases rubber tree latex yield by regulating aquaporins and alleviating the tapping-induced local increase in latex total solid content, Journal of plant growth regulation, vol. 35, no. 3, pp. 701-709, doi: 10.1007/s00344-016-9573-6.

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Title Ethephon increases rubber tree latex yield by regulating aquaporins and alleviating the tapping-induced local increase in latex total solid content
Author(s) Feng, An
Rookes, James
Xie, Guishui
Cahill, David
Cai, Xiuqing
Zou, Zhi
Kong, Lingxue
Journal name Journal of plant growth regulation
Volume number 35
Issue number 3
Start page 701
End page 709
Total pages 9
Publisher Springer
Place of publication New York, N.Y.
Publication date 2016-09
ISSN 0721-7595
1435-8107
Keyword(s) Hevea brasiliensis
latex
total solid content
ethephon
aquaporin
Summary 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.
Language eng
DOI 10.1007/s00344-016-9573-6
Field of Research 070108 Sustainable Agricultural Development
0607 Plant Biology
0706 Horticultural Production
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 ©2016, Springer
Persistent URL http://hdl.handle.net/10536/DRO/DU:30085783

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