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2,4-表油菜素内酯和生长素促进大麦胚芽鞘伸长生长的协同作用

DOI: 10.7685/j.issn.1000-2030.2006.03.005, PP. 23-27

Keywords: 吲哚乙酸,2,4-表油菜素内酯,胚芽鞘,伸长

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Abstract:

以大麦胚芽鞘为材料,研究了生长素吲哚乙酸(indole-3-aceticacid,IAA)和2,4表油菜素内酯(2,4-epibras-sinolide,epiBR)对胚芽鞘伸长的影响。结果表明200μmol.L-1IAA和1μmol.L-1epiBR在黑暗条件下均促进大麦胚芽鞘的伸长生长,而且在该过程中二者存在协同作用,但必须是在IAA之前施用epiBR或两者共同处理时才能表现;100mg.L-12,3,5三碘苯甲酸(2,3,5-triiodobenzoicacid,TIBA)能抑制epiBR诱导的胚芽鞘伸长生长,暗示IAA的极性运输是epiBR促进大麦胚芽鞘伸长生长所必需的;内源激素分析表明,epiBR处理后胚芽鞘内源IAA含量上升,暗示epiBR对大麦胚芽鞘伸长的促进作用在一定程度上通过调控内源IAA的水平起作用。

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