Physiological characteristics of latex of the IRRDB 1981 Hevea germplasm
1996
Lai, V. L. | Tan, H. | Gizan S. | Vo, T. T. H.
Five physiological parameters of latex, namely total solid content, sucrose inorganic phosphorus, contents of thiol groups and plugging index were studied on Wickham and germplasm clones. Results showed difference in profiles of + physiological characteristics of latex of the germplasm and Wickham groups. The germplasm clones were significantly higher than the Wickham clones in sucrose content of latex and plugging index (PI), but the latter (Wickham clones) were higher in the + contents of thiol groups (R-HS) and inorganic phosphorus (Pi). Significant positive correlations were found between yield and R-SH (r=0.31 , df=86) and between yield and Pi (r=0.40 , df=86), while a significant negative correlation was found between + yield and PI (r=0.31 , df=86) in the germplasm. Principal component analysis of the five physiological parameters of latex showed that the germplasm group was well separated from the Wickham group. There was no distinct separation among the three geographical groups of the germplasm.
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