Rubber biosynthesis in tapping panel dryness affected Hevea trees

Krishnakumar R., . and Cornish K., . and Jacob J., . Rubber biosynthesis in tapping panel dryness affected Hevea trees. pp. 131-139. ISSN 1511-1768

The activity of rubber transferase (RuT) determined in washed rubber particle (WRP) and whole latex showed a marked increase in the advanced stages of tapping panel dryness (TPD) compared to healthy and early stages of TPD. Prenyl transferase activity measured in the C-serum of latex showed a slight decrease in the early stages but was substantially large in the advanced stages of TPD. There was a positive correlation between RuT and prenyl transferase activities. The increased activities of RuT and prenyl transferase under in vitro conditions in the presence of adequate concentration of their substrates suggest the existence of a large number of small rubber particles in a given unit weight of WRP. The mean rubber particle size slightly increased in the early stages of TPD but was smaller in the advanced stages of TPD. The mean rubber particle size was negatively correlated with RuT activity. It is suspected that both RuT and prenyl transferase remained inactive under in vivo conditions possibly due to inadequate supply of their immediate substrates. These findings are discussed in the light of our earlier results that showed enhanced respiration in the TPD affected bark tissues caused by alternate respiration which was known for its low ATP yield.

Full text available from: Official URL: http://vitaldoc.lgm.gov.my:8060/vital/access/servi...

Abstract

The activity of rubber transferase (RuT) determined in washed rubber particle (WRP) and whole latex showed a marked increase in the advanced stages of tapping panel dryness (TPD) compared to healthy and early stages of TPD. Prenyl transferase activity measured in the C-serum of latex showed a slight decrease in the early stages but was substantially large in the advanced stages of TPD. There was a positive correlation between RuT and prenyl transferase activities. The increased activities of RuT and prenyl transferase under in vitro conditions in the presence of adequate concentration of their substrates suggest the existence of a large number of small rubber particles in a given unit weight of WRP. The mean rubber particle size slightly increased in the early stages of TPD but was smaller in the advanced stages of TPD. The mean rubber particle size was negatively correlated with RuT activity. It is suspected that both RuT and prenyl transferase remained inactive under in vivo conditions possibly due to inadequate supply of their immediate substrates. These findings are discussed in the light of our earlier results that showed enhanced respiration in the TPD affected bark tissues caused by alternate respiration which was known for its low ATP yield.

[error in script]

Item Type:	Article
AGROVOC Term:	Hevea
AGROVOC Term:	Biosynthesis
AGROVOC Term:	Tapping
AGROVOC Term:	Susceptibility to dryness
AGROVOC Term:	Transferases
AGROVOC Term:	Particle size
AGROVOC Term:	Latex
AGROVOC Term:	In vitro
AGROVOC Term:	Culture substrates
AGROVOC Term:	Respiration
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:28
URI:	http://webagris.upm.edu.my/id/eprint/23194

Actions (login required)

View Item