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Barley genotype expressing "stay-green"-like characteristics maintains starch quality of the grain during water stress condition

Gous, P. W. and Hasjim, J. and Franckowiak, J. and Fox, G. P. and Gilbert, R. G. (2013) Barley genotype expressing "stay-green"-like characteristics maintains starch quality of the grain during water stress condition. Journal of Cereal Science, 58 (3). pp. 414-419. ISSN 0733-5210

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Article Link(s): http://dx.doi.org/10.1016/j.jcs.2013.08.002

Abstract

The identification of "stay-green" in sorghum and its positive correlation with yield increases has encouraged attempts to incorporate "stay-green"-like traits into the genomes of other commercially important cereal crops. However, knowledge on the effects of "stay-green" expression on grain quality under extreme physiological stress is limited. This study examines impacts of "stay-green"-like expression on starch biosynthesis in barley (Hordeum vulgare L.) grain under mild, severe, and acute water stress conditions induced at anthesis. The proportions of long amylopectin branches and amylose branches in the grain of Flagship (a cultivar without "stay-green"-like characteristics) were higher at low water stress, suggesting that water stress affects starch biosynthesis in grain, probably due to early termination of grain fill. The changes in long branches can affect starch properties, such as the rates of enzymatic degradation, and hence its nutritional value. By contrast, grain from the "stay-green"-like cultivar (ND24260) did not show variation in starch molecular structure under the different water stress levels. The results indicate that the cultivar with "stay-green"-like traits has a greater potential to maintain starch biosynthesis and quality in grain during drought conditions, making the "stay-green"-like traits potentially useful in ensuring food security. (C) 2013 Elsevier Ltd. All rights reserved.

Item Type:Article
Business groups:Crop and Food Science
Additional Information:Gous, Peter W. Hasjim, Jovin Franckowiak, Jerome Fox, Glen P. Gilbert, Robert G. Academic press ltd- elsevier science ltd London
Keywords:Barley Water stress Starch structure Molecular structural characterisation physicochemical properties drought tolerance branched polymer digestion rice distributions biosynthesis evolution wheat
Subjects:Plant culture > Field crops > Barley
Agriculture > Agriculture (General) > Improvement, reclamation, fertilisation, irrigation etc., of lands (Melioration)
Deposited On:01 Jul 2014 04:19
Last Modified:01 Jul 2014 04:19

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