J Integr Plant Biol. ›› 2003, Vol. 45 ›› Issue (11): 1366-1372.

• Research Articles • Previous Articles     Next Articles

Localized Effects of Mechanical Wounding and Exogenous Jasmonic Acid on the Induction of Secondary Laticifer Differentiation in Relation to the Distribution of Jasmonic Acid in Hevea brasiliensis

TIAN Wei-Min, SHI Min-Jing, YU Feng-Yi, WU Ji-Lin, HAO Bing-Zhong, CUI Ke-Ming*   


The relationship between the effect of exogenous jasmonic acid (JA) on the induction of secondary laticifer differentiation and the distribution of JA in the seedling of Hevea brasiliensis Mull. Arg. was investigated with the aid of experimental morphological and radioisotope technique. Most radioactivity of 3H-JA sustained in treated site within one hour while no radioactivity was detected in new shoot and the radioactivity in upper leaf was much less than that in the parts below the treated site, suggesting that JA was mainly transported downwards in the shoot of H. brasiliensis. Mechanical wounding hindered the en-trance of exogenous JA remarkably while held back the entered JA to the regions around wounded site. The effect of exogenous JA and mechanical wounding on the induction of the secondary laticifer differen-tiation was limited to treated site where high level of JA was expected. Mechanical wounding reduced the effect of exogenous JA on the differentiation of secondary laticifer, which could be ascribed to the hindrance of mechanical wounding to the entrance of exogenous JA. It was concluded from the combined data that a high accumulation of JA was required for inducing the secondary laticifer differentiation in H. brasiliensis.

田维敏 史敏晶 于凤义  吴继林  郝秉中  崔克明

(1. 北京大学生命科学学院, 北京 100871;
2. 中国热带农业科学院橡胶栽培研究所热带作物栽培生理学农业部重点开放实验室, 儋州 571737;
3. 华南热带农业大学农学院, 儋州 571737; 4. 中国农业科学院原子能利用研究所, 北京 100094)
摘要: 采用同位素示踪技术和实验形态学的方法揭示茉莉酸在木本植物巴西橡胶树(Hevea brasiliensis Mull.
关键词: 巴西橡胶树; 茉莉酸; 机械伤害; 同位素示踪;乳管分化

通讯作者。E-mail: <ckm@pku.edu.cn>。

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