Cross Talk between Cytokinin and Jasmonates in Regulating the Secondary Laticifer Differentiation in Rubber Tree (Hevea brasiliensis Muell. Arg.)
文献类型: 外文期刊
作者: Zhang, S. X. 1 ; Tian, W. M. 1 ;
作者机构: 1.CATAS, Rubber Res Inst, Key Lab Biol & Genet Resources Rubber Tree,Minist, State Key Lab Incubat Base Cultivat & Physiol Tro, Danzhou 571737, Hainan, Peoples R China
2.Hainan Univ, Haikou 570228, Peoples R China
关键词: Hevea brasiliensis;secondary laticifer differentiation;mechanical wounding;jasmonic acid;6-benzyl aminopurine;vascular cambium;season
期刊名称:Journal of Rubber Research ( 影响因子:0.667; 五年影响因子:0.618 )
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收录情况: SCI
摘要: Number of secondary laticijers differentiating from vascular cambium have significant positive correlation with the rubber yield of Hevea. Secondary laticifer does not appear in the stem of the first and second extension unit (EU) ofHevea brasiliensis shoots under natural conditions. It can be induced by mechanical wounding or jasmonic acid (JA) treatment in these parts. Season obviously influences the secondary laticifer differentiation induced by mechanical wounding or JA. In the present paper, the relationship between cytoldnin content, vascular cambium activity and effect of mechanical wounding or exogenous JA on the secondary laticifer differentiation in the stem of H. brasiliensis shoots were revealed. The results of the experiment showed that vascular cambium were active from March to October and dormant from November to the following February in the stem of epicormic shoots of H. brasiliensis. Accordingly, the content of isopentenyl adenosine (IPA) in bark tissues was much higher in July than that in January. Either JA or mechanical wounding could induce the secondary laticifer differentiation in July, but neither of them was effective in January. Combination of JA with 6-benzyl aminopurine (6-BA) was quite effective on the secondary laticifer differentiation in January while less effective in July. It is suggested that appropriate ratio of JA to cytoldnin is pivotal in regulating the secondary laticifer differentiation in H. brasiliensis.
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