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Over-expression of mango (Mangifera indica L.) MiARF2 inhibits root and hypocotyl growth of Arabidopsis

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Abstract

An auxin response factor 2 gene, MiARF2, was cloned in our previous study [1] from the cotyledon section of mango (Mangifera indica L. cv. Zihua) during adventitious root formation, which shares an 84% amino acid sequence similarity to Arabidopsis ARF2. This study was to examine the effects of over-expression of the full-length MiARF2 open reading frame on the root and hypocotyl growth in Arabidopsis. Phenotype analysis showed that the T3 transgenic lines had about 20–30% reduction in the length of hypocotyls and roots of the seedlings in comparison with the wild-type. The transcription levels of ANT and ARGOS genes which play a role in controlling organ size and cell proliferation in the transgenic seedlings also decreased. Therefore, the inhibited root and hypocotyl growth in the transgenic seedlings may be associated with the down-regulated transcription of ANT and ARGOS by the over-expression of MiARF2. This study also suggests that although MiARF2 only has a single DNA-binding domain (DBD), it can function as other ARF-like proteins containing complete DBD, middle region (MR) and carboxy-terminal dimerization domain (CTD).

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Acknowledgments

The authors are grateful to Dr. Xie Qi for his valuable discussion and the gift of the pBA002 vector. This research was supported by the Natural Science Foundation of China 30470110.

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Authors and Affiliations

  1. The Key Laboratory of Gene Engineering of the Ministry of Education, School of Life Science, Sun Yat-sen (Zhongshan) University, 510275, Guangzhou, China

    Bei Wu, Qi-Zhu Chen, Xia Huang, Yun-Feng Chen & Xue-Lin Huang

  2. South Subtropical Crop Research Institute, Chinese Academy of Tropical Agricultural Science, 524091, Zhanjiang, China

    Yun-He Li

  3. Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Kowloon, Hong Kong

    Jian-Yong Wu

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  1. Bei Wu
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Correspondence to Jian-Yong Wu or Xue-Lin Huang.

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Wu, B., Li, YH., Wu, JY. et al. Over-expression of mango (Mangifera indica L.) MiARF2 inhibits root and hypocotyl growth of Arabidopsis . Mol Biol Rep 38, 3189–3194 (2011). https://doi.org/10.1007/s11033-010-9990-8

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  • DOI: https://doi.org/10.1007/s11033-010-9990-8

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