Preamylopectin Processing: A Mandatory Step for Starch Biosynthesis in Plants.
نویسندگان
چکیده
منابع مشابه
Regulation of Adp-glucose Pyrophosphorylase Subunit Expression –-a Key Enzyme for Starch Biosynthesis in Plants
INTRODUCTION Starch is the predominant carbon sink of storage organs and leaves of many plants. Substantial evidence from the analysis of starch-deficient mutants, transgenic plants, and enzyme kinetics suggest that ADP-glucose pyrophosphorylase (AGPase) catalyzes a key step for starch biosynthesis in both photosynthetic and nonphotosynthetic tissues. Fruit quality in tomato is largely a functi...
متن کاملStarch biosynthesis.
Starch is the most significant form of carbon reserve in plants in terms of the amount made, the universality of its distribution among different plant species, and its commercial importance. It consists of different glucose polymers arranged into a threedimensional, semicrystalline structure-the starch granule. The biosynthesis of starch involves not only the production of the composite glucan...
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Starch is the major storage carbohydrate in higher plants, with many important functions. In photosynthesizing leaves, starch accumulates during the day and is remobilized at night to support continued respiration, Suc export, and growth in the dark (Geiger and Servaites, 1994). In this context, starch has been identified as a major integrator in the regulation of plant growth to cope with cont...
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© 2014 TERRAPUB, Tokyo. All rights reserved. doi:10.5047/agbm.2014.00401.0001 water (Fig. 1) or treating it with alkaline, urea, or dimethyl sulfoxide through the cutting of hydrogen bonds between the starch molecules. It is thought that digestion of hydrogen bonds results in the unwinding of the double helices of parallel α-1,4 glucan chains in the crystal lamellae of amylopectin molecules. Th...
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The enzymic synthesis of ADP-glucose and UDP-glucose by chloroplastic pyrophosphorylase of bean and rice leaves has been demonstrated by paper chromatographic techniques. In both tissues, the activity of UDP-glucose-pyrophosphorylase was much higher than ADP-glucose-pyrophosphorylase. Glycerate-3-phosphate, phosphoenolpyruvate and fructose-1,6-diphosphate did not stimulate ADP-glucose formation...
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ژورنال
عنوان ژورنال: The Plant Cell
سال: 1996
ISSN: 1040-4651,1532-298X
DOI: 10.1105/tpc.8.8.1353