1999
DOI: 10.1104/pp.119.3.1017
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Mannose Inhibits Arabidopsis Germination via a Hexokinase-Mediated Step1

Abstract: Low concentrations of the glucose (Glc) analog mannose (Man) inhibit germination of Arabidopsis seeds. Man is phosphorylated by hexokinase (HXK), but the absence of germination was not due to ATP or phosphate depletion. The addition of metabolizable sugars reversed the Man-mediated inhibition of germination. Carbohydrate-mediated regulation of gene expression involving a HXK-mediated pathway is known to be activated by Glc, Man, and other monosaccharides. Therefore, we investigated whether Man blocks germinati… Show more

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Cited by 166 publications
(162 citation statements)
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“…Upon entry into the plant cell, Man is phosphorylated by hexokinase, yielding Man-6-P. Man-6-P is then slowly processed by plant cells, since the enzymes required for this process are either absent or exist in very low concentrations (Walder and Sivak, 1986). Man has been shown to inhibit germination of Arabidopsis seeds due to phosphorylation by hexokinase and not due to ATP or P depletion (Peto et al, 1999). As shown in Figure 6, the effect of Glc on mRNA accumulation of SU and SD genes was similar as in Figure 5.…”
Section: Phosphorylation Of Hexose Activates or Suppresses Sugar-regusupporting
confidence: 62%
“…Upon entry into the plant cell, Man is phosphorylated by hexokinase, yielding Man-6-P. Man-6-P is then slowly processed by plant cells, since the enzymes required for this process are either absent or exist in very low concentrations (Walder and Sivak, 1986). Man has been shown to inhibit germination of Arabidopsis seeds due to phosphorylation by hexokinase and not due to ATP or P depletion (Peto et al, 1999). As shown in Figure 6, the effect of Glc on mRNA accumulation of SU and SD genes was similar as in Figure 5.…”
Section: Phosphorylation Of Hexose Activates or Suppresses Sugar-regusupporting
confidence: 62%
“…The finding that even low concentrations (1%) of glucose are able to delay seed germination (Fig. 1a) was unexpected, since low concentrations of metabolizable sugars are effective in relieving the inhibitory action of ABA and mannose during germination (Garciarrubio et al 1997;Pego et al 1999;Finkelstein and Lynch 2000). As expected, elevated levels of glucose (up to 5%) restricted germination more severely.…”
Section: Exogenous Glucose Delays Germination Of Arabidopsis Seedsmentioning
confidence: 85%
“…This is shown by the reduced seed dormancy of aba and several abi mutants (Koornneef et al 1982(Koornneef et al , 1984, while the GA-deficient mutants (ga1, ga2 and ga3) are incapable of germination (Debeaujon and Koornneef 2000;Bentsink and Koornneef 2002). Previous studies showed that mannose and 2-deoxyglucose, both of which are substrates for HXK, are potent inhibitors of Arabidopsis seed germination (Pego et al 1999). Sugar uptake is probably not involved since the non-metabolizable sugars 6-DG and 3-OMG do not affect germination in this assay.…”
Section: Introductionmentioning
confidence: 99%
See 1 more Smart Citation
“…4C). In addition, mannose strongly inhibits seed germination and postgermination growth (27). It has been previously reported that the stp1 mutant exhibits insensitivity to galactose and mannose (11).…”
Section: The Absorption Of Monosaccharides From the Surroundingmentioning
confidence: 99%