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Int. J. Mol. Sci. 2015, 16(8), 17885-17908; doi:10.3390/ijms160817885

Involvement of Ethylene in the Latex Metabolism and Tapping Panel Dryness of Hevea brasiliensis

1
Centre International de Recherche Agronomique pour le Développement, Unité Mixte de Recherche Amélioration Génétique & Adaptation des Plantes Méditerranéennes et Tropicales, F-34398 Montpellier, France
2
Indonesian Research Institute for Biotechnology and Bioindustry, Bogor 16128, Indonesia
3
Indonesia Rubber Research Institute, Sembawa Research Centre, Palembang 30001, Indonesia
4
Rubber Research Institute of Thailand, Chatuchak, Bangkok 10900, Thailand
5
Centre International de Recherche Agronomique pour le Développement, Unité de Recherche Performance des Systèmes de Culture des Plantes Pérennes, F-34398 Montpellier, France
6
Indonesia Rubber Research Institute, Bogor 16151, Indonesia
These authors contributed equally to this work.
*
Authors to whom correspondence should be addressed.
Academic Editor: Ann Cuypers
Received: 23 April 2015 / Revised: 3 July 2015 / Accepted: 6 July 2015 / Published: 4 August 2015
(This article belongs to the Special Issue Abiotic Stress and Gene Networks in Plants)
View Full-Text   |   Download PDF [2421 KB, uploaded 5 August 2015]   |  

Abstract

Ethephon, an ethylene releaser, is used to stimulate latex production in Hevea brasiliensis. Ethylene induces many functions in latex cells including the production of reactive oxygen species (ROS). The accumulation of ROS is responsible for the coagulation of rubber particles in latex cells, resulting in the partial or complete stoppage of latex flow. This study set out to assess biochemical and histological changes as well as changes in gene expression in latex and phloem tissues from trees grown under various harvesting systems. The Tapping Panel Dryness (TPD) susceptibility of Hevea clones was found to be related to some biochemical parameters, such as low sucrose and high inorganic phosphorus contents. A high tapping frequency and ethephon stimulation induced early TPD occurrence in a high latex metabolism clone and late occurrence in a low latex metabolism clone. TPD-affected trees had smaller number of laticifer vessels compared to healthy trees, suggesting a modification of cambial activity. The differential transcript abundance was observed for twenty-seven candidate genes related to TPD occurrence in latex and phloem tissues for ROS-scavenging, ethylene biosynthesis and signalling genes. The predicted function for some Ethylene Response Factor genes suggested that these candidate genes should play an important role in regulating susceptibility to TPD. View Full-Text
Keywords: abiotic stress; antioxidant; ethephon; ethylene response factor; oxidative stress; rubber; transcription factor abiotic stress; antioxidant; ethephon; ethylene response factor; oxidative stress; rubber; transcription factor
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Putranto, R.-A.; Herlinawati, E.; Rio, M.; Leclercq, J.; Piyatrakul, P.; Gohet, E.; Sanier, C.; Oktavia, F.; Pirrello, J.; Kuswanhadi; Montoro, P. Involvement of Ethylene in the Latex Metabolism and Tapping Panel Dryness of Hevea brasiliensis. Int. J. Mol. Sci. 2015, 16, 17885-17908.

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