Bioregulation of carbohydrate metabolism in relation to source-sink operation during grain-filling phase of growth in wheat.

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dc.contributor.authorSidhu, Parminderen_US
dc.contributor.authorSingh, Rangilen_US
dc.date.accessioned2009-05-28T12:17:10Z
dc.date.available2009-05-28T12:17:10Z
dc.date.issued2002-09-18en_US
dc.description.abstractMobilization of free sugars from vegetative tissues to grain and their transformation to starch in relation to activities of some relevant enzymes during growth and development were investigated in wheat (Triticum aestivum L.). Vegetative tissues, viz. flag-leaf, flag-leaf sheath, nodes and internodes contained high concentration of free sugars from 70 DAS to 18 DPA and that was in the order of accumulation--flag-leaf sheath> flag-leaf and internodes > nodes. In these tissues, major portion of 14C appeared in endogenous sucrose, irrespective of the nature of (U-14C]-sugars supplied. In photosynthetic structures above flag-leaf node, namely peduncle, rachis and bracts, the free sugar make-up was maximum at anthesis (90 DAS). Activity of soluble acid invertase (EC 3.2.1.26) was high in these tissues during early stages of grain growth but reverse was true for soluble neutral invertase (EC 3.2.1.27) activity. In apical and basal portions of grain, free sugars were more or less similarly distributed in concentration. Linear and rapid accumulation of starch in endosperm paralleled with a decline in accumulation of this polymer in pericarp-aleurone. In the latter tissue, the activities of starch hydrolyzing enzymes, i.e alpha- and beta-amylases (3.2.1.1 and 3.2.1.2) were high during initial stages of grain growth. During active grain-filling, alkaline inorganic pyrophosphatase (EC 3.6.1.1) seemed to play a vital role during starch accumulation in endosperm, whereas the involvement of 3-PGA phosphatase (EC 3.1.3.38) was almost confined to pericarp-aleurone. Impairement of ear head photosynthesis by shading depressed starch synthesis (approximately 50%) indicating, thereby, the significant role of current photosynthates during grain-filling. The results suggested that grain growth in wheat was influenced by an efficient operation of source as well as regulatory factors, including enzymes, constituting intrinsic potential of grain sink.en_US
dc.description.affiliationDepartment of Biochemistry, Punjab Agricultural University, Ludhiana 141 004, India.en_US
dc.identifier.citationSidhu P, Singh R. Bioregulation of carbohydrate metabolism in relation to source-sink operation during grain-filling phase of growth in wheat. Indian Journal of Experimental Biology. 2002 Sep; 40(9): 1060-6en_US
dc.identifier.urihttps://imsear.searo.who.int/handle/123456789/57874
dc.language.isoengen_US
dc.source.urihttps://www.niscair.res.in/ScienceCommunication/ResearchJournals/rejour/ijeb/ijeb0.aspen_US
dc.subject.meshBiotransformationen_US
dc.subject.meshCarbohydrate Metabolismen_US
dc.subject.meshCarbon Isotopesen_US
dc.subject.meshCereals --chemistryen_US
dc.subject.meshGlycoside Hydrolases --metabolismen_US
dc.subject.meshPhosphoric Monoester Hydrolases --metabolismen_US
dc.subject.meshPhotosynthesis --drug effectsen_US
dc.subject.meshPyrophosphatases --metabolismen_US
dc.subject.meshStarch --metabolismen_US
dc.subject.meshSucrose --metabolismen_US
dc.subject.meshTriticum --chemistryen_US
dc.subject.meshalpha-Amylases --metabolismen_US
dc.subject.meshbeta-Amylase --metabolismen_US
dc.subject.meshbeta-Fructofuranosidaseen_US
dc.titleBioregulation of carbohydrate metabolism in relation to source-sink operation during grain-filling phase of growth in wheat.en_US
dc.typeJournal Articleen_US
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