巴西橡胶树排胶促进乳管分化的研究

In rubber tree (Hevea brasiliensis) laticifer is among the most impotant structural.components that determine the yield of rubber. Wu have demonstrated that latex.exploitation significantly accelerated laticifer formation. It was found in this project.that laticifer differentiation in young stem was induced by application of jasmonic.acid (JA) or linolenic acid, a precursor of JA biosynthesis. No effect on laticifer.differentiation was detectable with application of cytokinin (N6 benzyladenine),.idoleacetic acid, abscisic acid, ethephon or salicylic acid. Mechenical wounding.caused laticifer formation and this could be bloch in some degrees by application of.chemicals, the agents that inhibit JA biosynthesis. These facts show that JA is an.environnental signal that forms in rubber tree in response to stress conditions (e.g..suffering from latex exploitation) and induces laticifer differentiation. It is assumed.that JA also is a key signal for laticifer differentiation under normal development of.the tree. In the results of our study, the wound signal JA is at first related to the.defense structure laticifers, which function when plant is wounded. The results is.significant both to funderstand the unction of JA and the differentiation of cells. They.also give an important base for improving production of natural rubber.

巴西橡胶树乳管分化是一个很好的研究植物细胞分化的模型，也是橡胶树栽培的基础研究中重大的理论问题。我们发现排胶能够非常显著地促进乳管的分化，并假定已有乳管存在抑制将来乳管分化的因子。本项目采用实验形态学的方法研究排胶促进乳管分化的机制，为揭示乳管分化的分子机制打下基础，并为橡胶树栽培技术的发展提供理论根据。....