Suppression of gliadins results in altered protein body morphology in wheat

A - Papers appearing in refereed journals

Gil-Humanes, J., Piston, F., Shewry, P. R., Tosi, P. and Barro, F. 2011. Suppression of gliadins results in altered protein body morphology in wheat. Journal of Experimental Botany. 62 (12), pp. 4203-4213.

AuthorsGil-Humanes, J., Piston, F., Shewry, P. R., Tosi, P. and Barro, F.

Wheat gluten proteins, gliadins and glutenins, are of great importance in determining the unique biomechanical properties of wheat. Studies have therefore been carried out to determine their pathways and mechanisms of synthesis, folding, and deposition in protein bodies. In the present work, a set of transgenic wheat lines has been studied with strongly suppressed levels of γ-gliadins and/or all groups of gliadins, using light and fluorescence microscopy combined with immunodetection using specific antibodies for γ-gliadins and HMW glutenin subunits. These lines represent a unique material to study the formation and fusion of protein bodies in developing seeds of wheat. Higher amounts of HMW subunits were present in most of the transgenic lines but only the lines with suppression of all gliadins showed differences in the formation and fusion of the protein bodies. Large rounded protein bodies were found in the wild-type lines and the transgenic lines with reduced levels of γ-gliadins, while the lines with all gliadins down-regulated had protein bodies of irregular shape and irregular formation. The size and number of inclusions, which have been reported to contain triticins, were also higher in the protein bodies in the lines with all the gliadins down-regulated. Changes in the protein composition and PB morphology reported in the transgenic lines with all gliadins down-regulated did not result in marked changes in the total protein content or instability of the different fractions.

KeywordsGluten proteins; immunolocalization; protein bodies; RNAi; transgenic wheat; wheat endosperm
Year of Publication2011
JournalJournal of Experimental Botany
Journal citation62 (12), pp. 4203-4213
Digital Object Identifier (DOI)
Open accessPublished as bronze (free) open access
FunderBiotechnology and Biological Sciences Research Council
Funder project or codeCentre for Crop Genetic Improvement (CGI)
Cereal seed composition and end use quality
Publisher's version
Copyright license
Publisher copyright
File Access Level
Output statusPublished
Publication dates
Online11 May 2011
Publication process dates
Accepted21 Mar 2011
PublisherOxford University Press (OUP)

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