Sucrose and metabolism distribution patterns in the latices of three Hevea brasiliensis clones: effects of tapping and stimulation on the tree trunk

Kasemsap P., . and Chantuma P., . and Thanisawanyangkura S., . and Lacointe A., . and Silpi U., . and Ameglio T., . and Thaler P., . and Gohet E., . Sucrose and metabolism distribution patterns in the latices of three Hevea brasiliensis clones: effects of tapping and stimulation on the tree trunk. pp. 115-131. ISSN 1511-1768

This study describes the sucrose balance between supply and demand in the bark of the rubber tree along with concurrent latex metabolic activity. Experiments were designed using three hevea brasiliensis clones (PB 235 RRIM 600 and GT 1) in the same polyclonal plot at the Chachoengsao Rubber Research Centre (CRRC-DOA) in Thailand. Treatments were carried out on previously untapped trees (growth potential control) trees tapped without stimulation (1/2S d/3 6d/7 9m/12 physiological control) and trees tapped with ethephon stimulation (1/2S d/3 6d/7 9m/12 ET 2.5 5/y and 12/y). Tapping had a marked effect on latex physiology in the whole trunk. Sucrose concentration was significantly reduced. The Latex Diagnosis Mapping (LDM) method was used to describe the shape and size of the latex regeneration area and of the metabolically active bark area. For the three clones rubber production correlated with the estimated latex regeneration area. It took around 100 cm2 of latex regeneration area to regenerate 1 g of rubber. As it assesses the impact of any tapping system on whole trunk latex physiology the LDM method was used to develop new tapping systems such as systems involving ethylene gas stimulation micro-tapping cut systems and multi-tapping cut systems.

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Abstract

This study describes the sucrose balance between supply and demand in the bark of the rubber tree along with concurrent latex metabolic activity. Experiments were designed using three hevea brasiliensis clones (PB 235 RRIM 600 and GT 1) in the same polyclonal plot at the Chachoengsao Rubber Research Centre (CRRC-DOA) in Thailand. Treatments were carried out on previously untapped trees (growth potential control) trees tapped without stimulation (1/2S d/3 6d/7 9m/12 physiological control) and trees tapped with ethephon stimulation (1/2S d/3 6d/7 9m/12 ET 2.5 5/y and 12/y). Tapping had a marked effect on latex physiology in the whole trunk. Sucrose concentration was significantly reduced. The Latex Diagnosis Mapping (LDM) method was used to describe the shape and size of the latex regeneration area and of the metabolically active bark area. For the three clones rubber production correlated with the estimated latex regeneration area. It took around 100 cm2 of latex regeneration area to regenerate 1 g of rubber. As it assesses the impact of any tapping system on whole trunk latex physiology the LDM method was used to develop new tapping systems such as systems involving ethylene gas stimulation micro-tapping cut systems and multi-tapping cut systems.

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Item Type:	Article
AGROVOC Term:	Sucrose
AGROVOC Term:	Metabolism
AGROVOC Term:	Hevea brasiliensis
AGROVOC Term:	Tapping
AGROVOC Term:	Stimulation
AGROVOC Term:	Tree trunks
AGROVOC Term:	Clones
AGROVOC Term:	Latex
AGROVOC Term:	Mapping
AGROVOC Term:	Phosphorus
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:28
URI:	http://webagris.upm.edu.my/id/eprint/23092

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