AtMYB93 is a novel negative regulator of lateral root development in Arabidopsis

Daniel J Gibbs, Ute Voß, Susan A Harding, Jessica Fannon, Laura A Moody, Erika Yamada, Kamal Swarup, Candida Nibau, George W Bassel, Anushree Choudhary, Julien Lavenus, Susan J Bradshaw, Dov J Stekel, Malcolm J Bennett, Juliet C Coates

Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

67 Dyfyniadau (Scopus)
256 Wedi eu Llwytho i Lawr (Pure)

Crynodeb

Plant root system plasticity is critical for survival in changing environmental conditions. One important aspect of root architecture is lateral root development, a complex process regulated by hormone, environmental and protein signalling pathways. Here we show, using molecular genetic approaches, that the MYB transcription factor AtMYB93 is a novel negative regulator of lateral root development in Arabidopsis. We identify AtMYB93 as an interaction partner of the lateral-root-promoting ARABIDILLO proteins. Atmyb93 mutants have faster lateral root developmental progression and enhanced lateral root densities, while AtMYB93-overexpressing lines display the opposite phenotype. AtMYB93 is expressed strongly, specifically and transiently in the endodermal cells overlying early lateral root primordia and is additionally induced by auxin in the basal meristem of the primary root. Furthermore, Atmyb93 mutant lateral root development is insensitive to auxin, indicating that AtMYB93 is required for normal auxin responses during lateral root development. We propose that AtMYB93 is part of a novel auxin-induced negative feedback loop stimulated in a select few endodermal cells early during lateral root development, ensuring that lateral roots only develop when absolutely required. Putative AtMYB93 homologues are detected throughout flowering plants and represent promising targets for manipulating root systems in diverse crop species.

Iaith wreiddiolSaesneg
Tudalennau (o-i)1194-207
Nifer y tudalennau14
CyfnodolynNew Phytologist
Cyfrol203
Rhif cyhoeddi4
Dyddiad ar-lein cynnar06 Meh 2014
Dynodwyr Gwrthrych Digidol (DOIs)
StatwsCyhoeddwyd - Medi 2014

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