Abstract:

Minicut with gaseous ethylene stimulation is a new tapping method which can increase latex yield. To investigate the physiological mechanism，sucrose, phosphorus and total solid content, and its water potential were measured in the latex from flow area of rubber trees by micro-cut with gaseous ethylene, ethephon treatment or without treatment control, respectively. Differences of these physiological parameters were analyzed between before and after tapping in same treatment, as well as among different treatments. The results showed that the gaseous ethylene stimulation significantly promoted latex yield by increasing rubber flow area of trees. It was found that the difference of dry latex content between before tapping and after stopped flow could be used as an indicator in managing tapping production.

Key words: Hevea brasiliensis, minicut, flow area, physiological parameters