TRACKING CARBON FROM PHOTOSYNTHESIS TO LATEX WITH 13C FIELD LABELLING EXPERIMENT

Authors

  • Philippe Thaler CIRAD, Eco&Sols, Univ Montpellier F-34060 Montpellier, France. Hevea Research Platform in Partnership, Kasetsart University, Centre of Thai-French Cooperation on Higher Education and Research, 10900 Bangkok, Thailand.
  • Dorine Desalme Ecologie et Ecophysiologie Forestières, Faculté des Sciences, Université de Lorraine, UMR 1137, F-54506 Vandoeuvre-les-Nancy, France; Ecologie et Ecophysiologie Forestières, Centre de Nancy – Lorraine, INRA, UMR 1137, F-54280 Champenoux, France.
  • Ornuma Duangngam Hevea Research Platform in Partnership, Kasetsart University, Centre of Thai-French Cooperation on Higher Education and Research, 10900 Bangkok, Thailand.
  • Poonpipope Kasemsap Hevea Research Platform in Partnership, Kasetsart University, Centre of Thai-French Cooperation on Higher Education and Research, 10900 Bangkok, Thailand. Department of Horticulture, Faculty of Agriculture, Kasetsart University, Thailand.
  • Jate Sathornkich Hevea Research Platform in Partnership, Kasetsart University, Centre of Thai-French Cooperation on Higher Education and Research, 10900 Bangkok, Thailand.
  • Chompunut Chayawat Hevea Research Platform in Partnership, Kasetsart University, Centre of Thai-French Cooperation on Higher Education and Research, 10900 Bangkok, Thailand.
  • Duangrat Satakhun Hevea Research Platform in Partnership, Kasetsart University, Centre of Thai-French Cooperation on Higher Education and Research, 10900 Bangkok, Thailand.
  • Pierrick Priault Ecologie et Ecophysiologie Forestières, Faculté des Sciences, Université de Lorraine, UMR 1137, F-54506 Vandoeuvre-les-Nancy, France; Ecologie et Ecophysiologie Forestières, Centre de Nancy – Lorraine, INRA, UMR 1137, F-54280 Champenoux, France.
  • Nicolas Angeli Ecologie et Ecophysiologie Forestières, Faculté des Sciences, Université de Lorraine, UMR 1137, F-54506 Vandoeuvre-les-Nancy, France; Ecologie et Ecophysiologie Forestières, Centre de Nancy – Lorraine, INRA, UMR 1137, F-54280 Champenoux, France.
  • Pisamai Chantuma Chachoengsao Rubber Research Center, Rubber Authority of Thailand, Sanam Chaiket, Thailand.
  • Daniel Epron Ecologie et Ecophysiologie Forestières, Faculté des Sciences, Université de Lorraine, UMR 1137, F-54506 Vandoeuvre-les-Nancy, France; Ecologie et Ecophysiologie Forestières, Centre de Nancy – Lorraine, INRA, UMR 1137, F-54280 Champenoux, France.

DOI:

https://doi.org/10.22302/ppk.procirc2017.v1i1.484

Abstract

Rubber trees must mobilize a huge amount of carbon to regenerate the latex after tapping. Knowing the C sources and pathways towards latex will help managing tapping systems. We labelled 4y-old tapped rubber trees with 13CO2 and analyzed 13C content in leaves, phloem, wood and latex during one year to determine the dynamics of C allocation. The peak of 13C in latex 10-15 days after labelling in June indicated that newly assimilated C was mixed in a pool of reserves before being used to regenerate latex. The earlier (6-8 days) and much higher peak in October showed that when the regeneration metabolism was well established the transfer of recent assimilates was faster. In both cases 13C was recovered more than 40 days after labelling, demonstrating the contribution of reserves. 13C recovery in soluble sugars and quebrachitol, an important osmoticum, are followed-up to specify their dynamics.

Keywords: carbon allocation, carbohydrates, latex regeneration, reserves, stable isotopes.

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Issue

Agronomy Session

Section

Agronomy