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Temperature and nitrogen supply interact to determine protein distribution gradients in the wheat grain endosperm

Savill, G., Michalski, A., Powers, S. J., Wan, Y., Tosi, P., Buchner, P. and Hawkesford, M. J. (2018) Temperature and nitrogen supply interact to determine protein distribution gradients in the wheat grain endosperm. Journal of Experimental Botany, 69 (12). pp. 3117-3126. ISSN 0022-0957

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To link to this item DOI: 10.1093/jxb/ery127

Abstract/Summary

Gradients exist in the distribution of storage proteins in the wheat (Triticum aestivum L.) endosperm and determine the milling properties and protein recovery rate of the grain. A novel image analysis technique was developed to quantify both the gradients in protein concentration, and the size distribution of protein bodies within the endosperm of wheat plants grown under two different (20 °C or 28 °C) post-anthesis temperatures, and supplied with a nutrient solution with either high or low nitrogen content. Under all treatment combinations protein concentration was greater in the endosperm cells closest to the aleurone layer, and decreased towards the centre of the two lobes of the grain, i.e. a negative gradient. This was accompanied by a decrease in size of protein bodies from the outer to the inner endosperm layers in all but one of the treatments. Elevated post-anthesis temperature had the effect of increasing the magnitude of the negative gradients in both protein concentration and protein body size, whilst limiting nitrogen supply decreased the gradients.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Life Sciences > School of Agriculture, Policy and Development > Biodiversity, Crops and Agroecosystems Division > Crops Research Group
ID Code:76299
Publisher:Oxford University Press

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