Assimilate Partitioning
Mostrando 25-29 de 29 artigos, teses e dissertações.
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25. Cloning and Functional Analysis of Sucrose:Sucrose 1-Fructosyltransferase from Tall Fescue1
Enzymes of grasses involved in fructan synthesis are of interest since they play a major role in assimilate partitioning and allocation, for instance in the leaf growth zone. Several fructosyltransferases from tall fescue (Festuca arundinacea) have previously been purified (Lüscher and Nelson, 1995). It is surprising that all of these enzyme preparations ap
American Society of Plant Physiologists.
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26. His-65 in the proton–sucrose symporter is an essential amino acid whose modification with site-directed mutagenesis increases transport activity
The proton–sucrose symporter that mediates phloem loading is a key component of assimilate partitioning in many higher plants. Previous biochemical investigations showed that a diethyl pyrocarbonate-sensitive histidine residue is at or near the substrate-binding site of the symporter. Among the proton–sucrose symporters cloned to date, only the histidine
The National Academy of Sciences.
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27. A Similar Dichotomy of Sugar Modulation and Developmental Expression Affects Both Paths of Sucrose Metabolism: Evidence from a Maize Invertase Gene Family.
Invertase and sucrose synthase catalyze the two known paths for the first step in carbon use by sucrose-importing plant cells. The hypothesis that sugar-modulated expression of these genes could provide a means of import adjustment was initially suggested based on data from sucrose synthases alone; however, this hypothesis remained largely conjectural withou
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28. Enhancement of [14C]Sucrose Export from Source Leaves of Vicia faba by Gibberellic Acid 1
The effect of gibberellic acid (GA3) on sucrose export from source leaves was studied in broad bean (Vicia faba L.) plants trimmed of all but one source and one sink leaf. GA3 (10 micromolar) applied to the source leaf, enhanced export of [14C]sucrose (generated by 14CO2 fixation) to the root and to the sink leaf. Enhanced export was observed with GA treatme
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29. Physiological Site of Ethylene Effects on Carbon Dioxide Assimilation in Glycine max L. Merr 1
The physiological site of ethylene action on CO2 assimilation was investigated in intact plants of Glycine max L., using a whole-plant, open exposure system equipped witha remotely operated single-leaf cuvette. The objective of the study was met by investigating in control and ethylene-treated plants the (a) synchrony in response of CO2 assimilation, stomata