Spatiotemporal Profiling of Starch Biosynthesis and Degradation in the Developing Barley Grain1[W] (Record no. 45733)

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control field 20250625140652.0
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Transcribing agency CICY
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Classification number (OCLC) (R) ; Classification number, CALL (RLIN) (NR) B-11517
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Title Spatiotemporal Profiling of Starch Biosynthesis and Degradation in the Developing Barley Grain1[W]
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Volume/sequential designation Plant Physiology, 150, p.190-204, 2009
520 3# - SUMMARY, ETC.
Summary, etc. Barley (Hordeum vulgare)grains synthesize starch as the main storage compound. However, some starch is degraded already during caryopsis development. We studied temporal and spatial expression patterns of genes coding for enzymes of starch synthesis and degradation. These profiles coupled with measurements of selected enzyme activities and metabolites have allowed us to propose a role for starch degradation in maternal and filial tissues of developing grains. Early maternal pericarp functions as a major short-term starch storage tissue, possibly ensuring sink strength of the young caryopsis. Gene expression patterns and enzyme activities suggest two different pathways for starch degradation in maternal tissues. One pathway possibly occurs via a-amylases 1 and 4 and b-amylase 1 in pericarp, nucellus, and nucellar projection, tissues that undergo programmed cell death. Another pathway is deducted for living pericarp and chlorenchyma cells, where transient starch breakdown correlates with expression of chloroplast-localized b-amylases 5, 6, and 7, glucan, water dikinase 1, phosphoglucan, water dikinase, isoamylase 3, and disproportionating enzyme. The suite of genes involved in starch synthesis in filial starchy endosperm is much more complex than in pericarp and involves several endosperm-specific genes. Transient starch turnover occurs in transfer cells, ensuring the maintenance of sink strength in filial tissues and the reallocation of sugars into more proximal regions of the starchy endosperm. Starch is temporally accumulated also in aleurone cells, where it is degraded during the seed filling period, to be replaced by storage proteins and lipids.
700 12 - ADDED ENTRY--PERSONAL NAME
Personal name Radchuk, V.V:
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Personal name Borisjuk, L.
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Personal name Sreenivasulu, N.
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Personal name Merx, K.
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Personal name Mock, H.P.
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Personal name Rolletschek, H.
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Personal name Wobus, U.
700 12 - ADDED ENTRY--PERSONAL NAME
Personal name Wobus, U.
856 40 - ELECTRONIC LOCATION AND ACCESS
Uniform Resource Identifier <a href="https://drive.google.com/file/d/15JcGHerLoA-e3Shn9118byt2pirj68HR/view?usp=drivesdk">https://drive.google.com/file/d/15JcGHerLoA-e3Shn9118byt2pirj68HR/view?usp=drivesdk</a>
Public note Para ver el documento ingresa a Google con tu cuenta: @cicy.edu.mx
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Source of classification or shelving scheme Clasificación local
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  Clasificación local     Ref1 CICY CICY Documento préstamo interbibliotecario 25.06.2025   B-11517 25.06.2025 25.06.2025 Documentos solicitados