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Abstract Detail


Developmental and Structural Section

Wang, Shucai [1], Chang, Ying [1], Guo, Jianjun [1], Chen, Jin-Gui [1].

Comprehensive analysis of single-repeat R3 MYB transcription factors in trichome patterning in Arabidopsis.

Single-repeat R3 MYB transcription factors are critical components of the lateral inhibition machinery that mediates trichome patterning in Arabidopsis. Previously, we showed that TRICHOMELESS1 (TCL1), a single-repeat R3 MYB transcription factor, controls trichome formation on inflorescence stems and pedicels. Here we conducted a comprehensive analysis of all six single-repeat R3 MYB transcription factors including TRIPTYCHON (TRY), CAPRICE (CPC), and ENHANCER of TRY and CPC 1, 2, and 3 (ETC1, ETC2 and ETC3) in trichome development in Arabidopsis. By analyzing single, double, triple, quadruple and quintuple mutants, we are able to draw broader conclusions about the role of this gene family in trichome development than were possible in the earlier studies. We demonstrated that each member of the single-repeat R3 MYB transcription factor family has a role in controlling leaf trichome initiation and trichome cluster formation. We found that in addition to TCL1 and CPC, ETC1 and ETC3 also participate in controlling trichome formation on inflorescence stems and pedicles. Further, we discovered that single-repeat R3 MYBs suppress trichome formation on cotyledons and siliques, organs that normally do not bear any trichomes. Taken together, these findings reveal the genetic basis of organ-specific control of trichome formation and provide new insight into the lateral inhibition mechanism that mediates trichome patterning.


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1 - University of British Columbia, Department of Botany, 6270 University Boulevard, Vancouver, BC, V6T 1Z4, Canada

Keywords:
trichome
myb transcription factor
Arabidopsis.

Presentation Type: Oral Paper:Papers for Sections
Session: 50
Location: 209/SUB
Date: Tuesday, July 29th, 2008
Time: 4:00 PM
Number: 50002
Abstract ID:653


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