GbTCP, a cotton TCP transcription factor, confers fibre elongation and root hair development by a complex regulating system

Juan Hao, Lili Tu, Haiyan Hu, Jiafu Tan, Fenglin Deng, Wenxin Tang, Yichun Nie, Xianlong Zhang

Research output: Contribution to journalArticle

74 Citations (Scopus)

Abstract

As the most important natural raw material for textile industry, cotton fibres are an excellent model for studying single-cell development. Although expression profiling and functional genomics have provided some data, the mechanism of fibre development is still not well known. A class I TCP transcription factor (designated GbTCP), encoding 344 amino acids, was isolated from the normalized cDNA library of sea-island cotton fibre (from-2 to 25 days post anthesis). GbTCP was preferentially expressed in the elongating cotton fibre from 5 to 15 days post anthesis. Some expression was also observed in stems, apical buds, and petals. RNAi silencing of GbTCP produced shorter fibre, a reduced lint percentage, and a lower fibre quality than the wild-type plants. Overexpression of GbTCP enhanced root hair initiation and elongation in Arabidopsis and regulated branching. Solexa sequencing and Affymetrix GeneChip analysis indicated that GbTCP positively regulates the level of jasmonic acid (JA) and, as a result, activates downstream genes (reactive oxygen species, calcium signalling, ethylene biosynthesis and response, and several NAC and WRKY transcription factors) necessary for elongation of fibres and root hairs. JA content analysis in cotton also confirmed that GbTCP has a profound effect on JA biosynthesis. In vitro ovule culture showed that an appropriate concentration of JA promoted fibre elongation. The results suggest that GbTCP is an important transcription factor for fibre and root hair development by regulating JA biosynthesis and response and other pathways, including reactive oxygen species, calcium channel and ethylene signalling.

Original languageEnglish
Pages (from-to)6267-6281
Number of pages15
JournalJournal of experimental botany
Volume63
Issue number17
DOIs
Publication statusPublished - Oct 1 2012

Keywords

  • Affymetrix GeneChip
  • Arabidopsis root hair
  • Solexa sequencing
  • TCP
  • cotton fibre
  • jasmonic acid
  • transcription factor

ASJC Scopus subject areas

  • Physiology
  • Plant Science

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