000			01803nam a2200217Ia 4500
008			220216s9999 xx 000 0 und d
100			_aKrishnakumar R
245		0	_aRubber biosynthesis in tapping panel dryness affected Hevea trees
260			_bProceedings of IRRDB Symposium 1999, Hainan, Peoples Republic of China. pp.228-235.
520			_aThe 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 of TPD, 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 presence of adequate conversion of their substrates suggest the presence 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.
650			_aHevea brasiliensis
650			_aParticle size
650			_aPrenyl transferase
650			_aRubber biosynthesis
650			_aRut
650			_aTPD
650			_aWRP
700			_aCornish K
700			_aJacob J
942			_cJS
999			_c67476 _d67476