Overexpression of cotton (Gossypium hirsutum) dirigent1 gene enhances lignification that blocks the spread of Verticillium dahliae

文献类型： 外文期刊

第一作者： Haiyan Shi;;Zhihao Liu

作者： Haiyan Shi;Zhihao Liu;Li Zhu;Chaojun Zhang;Yun Chen;Ying Zhou;Fuguang Li;Xuebao Li

作者机构：

关键词： cotton (Gossypium hirsutum);dirigent protein;lignin;Verticillium wilt;overexpression

期刊名称：ACTA BIOCHIMICA ET BIOPHYSICA SINICA （ 影响因子：3.848； 五年影响因子：3.67 ）

ISSN： 1672-9145

年卷期： 2012 年 44 卷 7 期

页码：

收录情况： SCI

摘要： Dirigent super-family abounds throughout the plant kingdom, especially vascular plants. To elucidate the function of cotton (Gossypium hirsutum) DIR genes in lignification, two cDNAs (designated GhDIR1 and GhDIR2) encoding putative dirigent proteins were isolated from cotton cDNA libraries. Real-time quantitative reverse transcription-polymerase chain reaction analysis revealed that GhDIR1 transcript was preferentially accumulated in cotton hypocotyls, whereas GhDIR2 was predominantly expressed in cotton fibers. Overexpression of GhDIR1 gene resulted in an increase in lignin content in transgenic cotton plants, compared with that of wild type. Histochemical assay revealed that the transgenic plants displayed more widespread lignification than that of wild type in epidermis and vascular bundle. Furthermore, the transgenic cotton plants displayed more tolerance to the infection of Verticillium dahliae. Our data suggest that GhDIR1 may be involved in cotton lignification which can block the spread of fungal pathogen V. dahliae.

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