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Originally published as Genetics Published Articles Ahead of Print on September 9, 2008.
Genetics, Vol. 180, 811-820, October 2008, Copyright © 2008
doi:10.1534/genetics.108.093070
The R2R3 MYB Transcription Factor GhMYB109 Is Required for Cotton Fiber Development
Li Pu*,
,
Qun Li*,
Xiaoping Fan
,
,
Weicai Yang* and
Yongbiao Xue*,1
* Institute of Genetics and Developmental Biology, Chinese Academy of Sciences and National Centre for Plant Gene Research, Beijing 100101, China, Graduate University of Chinese Academy of Sciences, Beijing 100049, China, School of Life Science, China Northwest University, Xi'an 710069, Shanni Province, China and Institute of Cotton Research, Shanxi Academy of Agricultural Sciences, Yuncheng 044000, Shanxi Province, China
1 Corresponding author: Institute of Genetics and Developmental Biology, Chinese Academy of Sciences and National Center for Plant Gene Research, Datun Rd., Beijing 100101, China.
E-mail: ybxue{at}genetics.ac.cn
Cotton (Gossypium hirsutum L.) fibers are single highly elongated cells derived from the outer epidermis of ovules. A large number of genes are required for fiber differentiation and development, but so far, little is known about how these genes control and regulate the process of fiber development. Here we examine the role of the cotton-fiber-specific R2R3 MYB gene GhMYB109 in cotton fiber development. Transgenic reporter gene analysis revealed that a 2-kb GhMYB109 promoter was sufficient to confirm its fiber-specific expression. Antisense-mediated suppression of GhMYB109 led to a substantial reduction in fiber length. Consistently, several genes related to cotton fiber growth were found to be significantly reduced in the transgenic cotton. Our results showed that GhMYB109 is required for cotton fiber development and reveal a largely conserved mechanism of the R2R3 MYB transcription factor in cell fate determination in plants.