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Starch structure in developing barley endosperm
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DOI：10.1016/j.ijbiomac.2015.09.013.png)
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Barley spikes of the cultivars/breeding lines Gustav, Karmose and SLU 7 were harvested at 9, 12 and 24 days after flowering in order to study starch structure in developing barley endosperm. Kernel dry weight, starch content and amylose content increased during development. Structural analysis was performed on whole starch and included the chain-length distribution of the whole starches and their beta-limit dextrins. Karmose, possessing the amo1 mutation, had higher amylose content and a lower proportion of long chains (DP >= 38) in the amylopectin component than SLU 7 and Gustay. Structural differences during endosperm development were seen as a decrease in molar proportion of chains of DP 22-37 in whole starch. In beta-limit dextrins, the proportion of B-fp-chains (DP 4-7) increased and the proportion of BSmajor-chains (DP 15-27) decreased during development, suggesting more frequent activity of starch branching enzymes at later stages of maturation, resulting in amylopectin with denser structure. (C) 2015 Elsevier B.V. All rights reserved.
Keyword:
Barley
Starch
Amylopectin structure
Endosperm development
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8.5
论文数:
5.1W
被引数:
21.7W
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