Publications

Authors:

Zenoni, Sara; Fasoli, Marianna; Tornielli, Giovanni Battista; DAL SANTO, Silvia; Sanson, Andrea; P. d., Groot; Sordo, Sara; S., Citterio; Monti, Francesca; Pezzotti, Mario

Title:

Overexpression of PhEXPA1 increases cell size, modifies cell wall polymer composition and affects the timing of axillary meristem development in Petunia hybrida.

Year:

2011

Type of item:

Articolo in Rivista

Tipologia ANVUR:

Articolo su rivista

Language:

Inglese

Referee:

Sì

Name of journal:

New Phytologist

ISSN of journal:

0028-646X

N° Volume:

191

:

Blackwell Publishing

Page numbers:

662-677

Keyword:

axillary meristem; cell expansion; cell wall; expansin; Petunia hybrida

Short description of contents:

• Expansins are cell wall proteins required for cell enlargement and cell wall loosening during many developmental processes. The involvement of the Petunia hybrida expansin A1 (PhEXPA1) gene in cell expansion, the control of organ size and cell wall polysaccharide composition was investigated by overexpressing PhEXPA1 in petunia plants. • PhEXPA1 promoter activity was evaluated using a promoter-GUS assay and the protein's subcellular localization was established by expressing a PhEXPA1-GFP fusion protein. PhEXPA1 was overexpressed in transgenic plants using the cauliflower mosaic virus (CaMV) 35S promoter. Fourier transform infrared (FTIR) and chemical analysis were used for the quantitative analysis of cell wall polymers. • The GUS and GFP assays demonstrated that PhEXPA1 is present in the cell walls of expanding tissues. The constitutive overexpression of PhEXPA1 significantly affected expansin activity and organ size, leading to changes in the architecture of petunia plants by initiating premature axillary meristem outgrowth. Moreover, a significant change in cell wall polymer composition in the petal limbs of transgenic plants was observed. • These results support a role for expansins in the determination of organ shape, in lateral branching, and in the variation of cell wall polymer composition, probably reflecting a complex role in cell wall metabolism.

Web page:

http://dx.doi.org/10.1111/j.1469-8137.2011.03726.x

Product ID:

61260

Handle IRIS:

11562/359798

Deposited On:

August 1, 2011

Last Modified:

November 15, 2022

Bibliographic citation:

Zenoni, Sara; Fasoli, Marianna; Tornielli, Giovanni Battista; DAL SANTO, Silvia; Sanson, Andrea; P. d., Groot; Sordo, Sara; S., Citterio; Monti, Francesca; Pezzotti, Mario, Overexpression of PhEXPA1 increases cell size, modifies cell wall polymer composition and affects the timing of axillary meristem development in Petunia hybrida. «New Phytologist» , vol. 191 , 2011 , pp. 662-677

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