Abstract:The latex physiological parameters, such as total solid content, inorganic phosphorus, thiols, sucrose content, and invertase activity, and the yield in three clones (Reyan 7-33-97, Reyan 8-79 and PR107) of Hevea brasiliensis were analyzed. The results showed that there were significant difference in latex yield and physiological parameters among the three clones at early latex productive stage and tapped without ethrel stimulation. The latex yields were in order as: Reyan 8-79>Reyan 7-33-97>PR107. The activity of latex invertase had positive correlation to latex yield (P<0.01), while the other physiological parameters had not. The cumulative rainfall before tapping had different effects on the three clones, in which PR107 had the most influence, so it seemed to be an important factor in latex yield. These results suggested that there were specificity in latex production among clones, and it needs establish clone-suitable tapping systems.
