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Journal of Tea Science ›› 2014, Vol. 34 ›› Issue (1): 36-44.doi: 10.13305/j.cnki.jts.2014.01.005

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Cloning and Functional Verification of Two MYB Transcription Factors in Tea Plant [Camellia sinensis (L.) ]

GONG Niandi1, GUO Lili1, WANG Hongxue2, ZHAO Lei2, WANG Jie1, WANG Wenzhao2, LIU Yajun1, WANG Yunsheng1, GAO Liping1,*, XIA Tao2,*   

  1. 1. School of Biology Science, Anhui Agricultural University, Hefei 230036, China;
    2. Key Lab of Tea Biochemistry and Biotechnology, Ministry of Education, Anhui Agricultural University, Hefei 230036, China
  • Received:2013-05-07 Revised:2013-06-26 Published:2019-09-03

Abstract: R2R3-MYB in Sg4 subgroup probably participated in the regulation of lignin biosynthesis, which possibly play an important physiological role in plant growth and development. Two MYB transcription factors CsMYB4-5 and CsMYB4-6 in Sg4 subgroup were cloned by RACE technology. Investigation showed that the amino acid sequence of CsMYB4-5 showed 48.45% identity to AmMYB330 from Antirrhinum majus and 44.79% to AtMYB3 from Arabidopsis thaliana, while CsMYB4-6 showed 69.80% identity to AmMYB308 from Antirrhinum majus and 62.41% to AtMYB4 from Arabidopsis thaliana by bioinformatics analysis. The result of real-time fluorescent quantitative PCR showed that these two genes had all high expression levels in root while low expression levels in stem. The analysis of prokaryotic expression revealed that the recombinant CsMYB4-5 and CsMYB4-6 were expressed with a molecular weight of about 32 kD and 27 kD respectively. Compared with wild tobacco, transgenic tobacco with CsMYB4-6 gene appeared following symptoms: the veins of leaf tighten, lamina surface between veins with sags and crests, with white freckles in old leaf, but in transgenic tobacco with CsMYB4-5 gene the elder leaves turned yellow.

Key words: Camellia sinensis (L.), MYB transcription factor, expression analysis, prokaryotic expression analysis, transgenic tobacco analysis

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