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In Arabidopsis thaliana (L.) Heynh ecotype Landsberg, levels of soluble acid invertase activity are closely related to the progress of seed germination. To study the mechanism(s) of the development of these enzymes, two cDNA clones that encode putative vacuolar acid invertases were isolated from
Multiple isoforms of beta-fructofuranosidase (invertase, EC 3.2.1.26) were identified in mature green leaves of the cruciferous plant Arabidopsis thaliana (L.) Heynh. There were four major and one minor isoforms of soluble acid invertase and an additional activity which could be released from the
A mutant of Arabidopsis thaliana (L.) Heynh. which lacks leaf starch was isolated by screening for plants which did not stain with iodine. The starchless phenotype, confirmed by quantitative enzymic analysis, is caused by a single recessive nuclear mutation which results in a deficiency of the
The metabolism of sucrose is of crucial importance for life on Earth. In plants, enzymes called invertases split sucrose into glucose and fructose, contributing to the regulation of metabolic fluxes. Invertases differ in their localization and pH optimum. Acidic invertases present in plant cell
Central metabolism is a coordinated network that is regulated at multiple levels by resource availability and by environmental and developmental cues. Its genetic architecture has been investigated by mapping metabolite quantitative trait loci (QTL). A more direct approach is to identify enzyme
Phosphatidylinositol monophosphate 5-kinase (PIP5K) plays an essential role in coordinating plant growth, especially in response to environmental factors. To explore the physiological function of PIP5K, we characterized Arabidopsis thaliana PIP5K9, which is constitutively expressed. We found that a
Invertases catalyze the irreversible hydrolysis of sucrose to glucose and fructose. Plants contain two unrelated families of these enzymes: acid forms that derive from periplasmic invertases of eubacteria and are found in cell wall and vacuole, and neutral/alkaline forms evolved from the cytosolic