Impact of drought stress on the aleurone layer from common wheat (T. aestivum) grains

Résumé fourni par la source

ABSTRACT Common wheat near-isogenic lines carrying wild or mutated allele of the gene encoding Puroindoline B and displaying distinct hardness, soft or hard corresponding to the two main defined classes in relation to their uses in food making, were grown for two years under well-watered or water-deficit conditions. Grains produced under drought conditions were lighter and smaller with reduced levels of biochemical markers concentrated in the aleurone layer cytoplasm: i.e. ash, phytic acid and albumins-globulins. These results suggested that drought affects either the aleurone layer proportion or its thickness. This is consistent with the known impact of drought on reducing germination, given the key role of the aleurone layer during this stage of plant growth. X-ray micro-tomography was then used to analyze the aleurone layer in three-dimensions. No changes were observed in the overall volume proportion of the aleurone layer between grains grown under distinct hydric conditions. However, for the first time, variations in the aleurone layer thickness were highlighted, with drought reducing the median thickness within this tissue.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.