The Arabidopsis AtMYB41 gene encodes an R2R3-MYB transcription factor whose expression is not detectable under normal growth conditions in any organ or at any developmental stage analysed. It is expressed at high levels in response to drought, ABA and salt treatments, suggesting a possible role in stress responses. Transgenic lines over-expressing this transcription factor showed a pleiotropic phenotype similar to that exhibited by some mutants that affect cuticle biosynthesis. This includes a dwarf appearance, dependent on smaller cells with abnormal morphology, enhanced sensitivity to desiccation, and enhanced permeability of leaf surfaces, suggesting discontinuity in the cuticle. The expression of genes involved in lipid metabolism and transport, in cell-wall modifications and cell expansion, genes coding for membrane-associated proteins and genes specifically involved in cuticle metabolism was differentially modulated between wild-type and transgenic plants, suggesting a direct or indirect role of AtMYB41 in the regulation of their transcription. Taken together, our results suggest that AtMYB41 is part of a complex network of transcription factors controlling cell expansion and cuticle deposition in response to abiotic stress.

Over-expression of the Arabidopsis AtMYB41 gene alters cell expansion and leaf surface permeability / E. Cominelli, T. Sala, D. Calvi, G. Gusmaroli, C. Tonelli. - In: PLANT JOURNAL. - ISSN 0960-7412. - 53:1(2008 Jan), pp. 53-64. [10.1111/j.1365-313X.2007.03310.x]

Over-expression of the Arabidopsis AtMYB41 gene alters cell expansion and leaf surface permeability

E. Cominelli
Primo
;
T. Sala
Secondo
;
G. Gusmaroli
Penultimo
;
C. Tonelli
Ultimo
2008-01

Abstract

The Arabidopsis AtMYB41 gene encodes an R2R3-MYB transcription factor whose expression is not detectable under normal growth conditions in any organ or at any developmental stage analysed. It is expressed at high levels in response to drought, ABA and salt treatments, suggesting a possible role in stress responses. Transgenic lines over-expressing this transcription factor showed a pleiotropic phenotype similar to that exhibited by some mutants that affect cuticle biosynthesis. This includes a dwarf appearance, dependent on smaller cells with abnormal morphology, enhanced sensitivity to desiccation, and enhanced permeability of leaf surfaces, suggesting discontinuity in the cuticle. The expression of genes involved in lipid metabolism and transport, in cell-wall modifications and cell expansion, genes coding for membrane-associated proteins and genes specifically involved in cuticle metabolism was differentially modulated between wild-type and transgenic plants, suggesting a direct or indirect role of AtMYB41 in the regulation of their transcription. Taken together, our results suggest that AtMYB41 is part of a complex network of transcription factors controlling cell expansion and cuticle deposition in response to abiotic stress.
MYB, over-expression, cuticle, cell expansion, Arabidopsis thaliana
Settore BIO/18 - Genetica
Article (author)
File in questo prodotto:
File Dimensione Formato  
Over-expression of the Arabidopsis AtMYB41 gene.pdf

accesso aperto

Tipologia: Publisher's version/PDF
Dimensione 418.14 kB
Formato Adobe PDF
418.14 kB Adobe PDF Visualizza/Apri
Pubblicazioni consigliate

Caricamento pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/39823
Citazioni
  • ???jsp.display-item.citation.pmc??? 72
  • Scopus 162
  • ???jsp.display-item.citation.isi??? 140
social impact