Gibberellin Promotes Shoot Branching in the Perennial Woody Plant Jatropha curcas.

作者:

Jun Ni

刊物名称:

Plant Cell Physiology

所属学科:

论文题目:

Gibberellin Promotes Shoot Branching in the Perennial Woody Plant Jatropha curcas.

卷期页码:

2015,56(8):1655-1666.

通讯作者:

Zengfu Xu

收录类别:

影响因子:

5.613

参与作者:

备注:

摘要:

Strigolactone (SL), auxin and cytokinin (CK) interact to regulate shoot branching. CK has long been considered to be the only key phytohormone to promote lateral bud outgrowth.Here we report that gibberellin also acts as a positive regulator in the control of shoot branching in the woody plant Jatropha curcas. We show that gibberellin and CK synergistically promote lateral bud outgrowth, and that both hormones influence the expression of putative branching regulators, J. curcas BRANCHED1 and BRANCHED2, which are key transcription factors maintaining bud dormancy.Moreover, treatment with paclobutrazol, an inhibitor of denovo gibberellin biosynthesis, significantly reduced the promotion of bud outgrowth by CK, suggesting that gibberellin is required for CK-mediated axillary bud outgrowth. In addition,SL, a plant hormone involved in the repression of shoot branching, acted antagonistically to both gibberellin and CK in the control of lateral bud outgrowth. Consistent with this, the expression of JcMAX2, a J. curcas homolog of Arabidopsis MORE AXILLARY GROWTH 2 encoding an F-box protein in the SL signaling pathway, was repressed by gibberellin and CK treatment. We also provide physiological evidence that gibberellin also induces shoot branching in many other trees, such as papaya, indicating that a more complicated regulatory network occurs in the control of shoot branching in some perennial woody plants.

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