Deficiency of maize starch-branching enzyme i results in altered starch fine structure, decreased digestibility and reduced coleoptile growth during germination (Record no. 48136)

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control field 20250625153932.0
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Transcribing agency CICY
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Classification number (OCLC) (R) ; Classification number, CALL (RLIN) (NR) B-13939
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Title Deficiency of maize starch-branching enzyme i results in altered starch fine structure, decreased digestibility and reduced coleoptile growth during germination
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Volume/sequential designation BMC Plant Biology, 31(6), p.563-572, 2005
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Summary, etc. Background: Two distinct starch branching enzyme (SBE)isoforms predate the divergence of monocots and dicots and have been conserved in plants since then. This strongly suggests that both SBEI and SBEII provide unique selective advantages to plants. However, no phenotype for the SBEI mutation, sbe1a, had been previously observed. To explore this incongruity the objective of the present work was to characterize functional and molecular phenotypes of both sbe1a and wild-type (Wt)in the W64A maize inbred line. Results: Endosperm starch granules from the sbe1a mutant were more resistant to digestion by pancreatic aamylase, and the sbe1a mutant starch had an altered branching pattern for amylopectin and amylose. When kernels were germinated, the sbe1a mutant was associated with shorter coleoptile length and higher residual starch content, suggesting that less efficient starch utilization may have impaired growth during germination. Conclusions: The present report documents for the first time a molecular phenotype due to the absence of SBEI, and suggests strongly that it is associated with altered physiological function of the starch in vivo. We believe that these results provide a plausible rationale for the conservation of SBEI in plants in both monocots and dicots, as greater seedling vigor would provide an important survival advantage when resources are limited.
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Personal name Huan Xia
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Personal name Marna, Y-N.
700 12 - ADDED ENTRY--PERSONAL NAME
Personal name Thompson, D.B.
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Personal name Guiltinan, M.J.
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Uniform Resource Identifier <a href="https://drive.google.com/file/d/153315zWwOk4qOf4MXkPXoZNKAYWgoCjQ/view?usp=drivesdk">https://drive.google.com/file/d/153315zWwOk4qOf4MXkPXoZNKAYWgoCjQ/view?usp=drivesdk</a>
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  Clasificación local     Ref1 CICY CICY Documento préstamo interbibliotecario 25.06.2025   B-13939 25.06.2025 25.06.2025 Documentos solicitados