NASCArrays Information at The BAR

Welcome to NASCArrays information at the BAR. This page hosts meta-information from the NASCArrays service (2002-2013). This information was parsed from text files available on the NASCArrays site. NASCArrays data is on iPlant server. To download experiment data from iPlant, please click on the experiment number. To download the CEL files, please click on the ftp link.

Title:Identification of genes responsive to non-metabolised glucose analoges as an approach to hexokinase-
Description:It has been strongly argued that plant cells should have a means of sensing sugars at the cell surface, so that extracellular and intracellular sugars can be sensed separately and their metabolism coordinated (Lalonde et al., Plant Cell, 11, 707-26, 2000). There is good evidence for an intracellular hexokinase-dependent pathway of hexose sensing in plants, but very little evidence for a hexokinase-independent signalling pathway, such as that provided by SNF3 or RGT2 in yeast. Many papers on sugar sensing in plants cite work from two laboratories as evidence for hexokinase-independent hexose signalling in plants. The first is that in which cell-wall invertase and sucrose synthase genes were induced by treatment of a Chenopodium suspension culture with 30 mM 6-Deoxyglucose (6DOG) for 24 h (Roitsch et al., Plant Physiol 108, 285-294, 1995; Godt et al., J. Plant Physiol 146, 231-238, 1995). The second is that in which a patatin transgene in Arabidopsis was shown to be weakly induced by growth over several days on a mixture of 30 mM glucose plus 30 mM 3-O-methylglucose (3OMG), but strongly induced by growth on 30 mM Glc plus 90 mM 3OMG (Martin et al., Plant J, 11, 53-62, 1997). We are not aware of any examples of Arabidopsis genes which respond to 6DOG or 3OMG yet this is an area of wide significance. Identification of such a gene would help to establish if a hexokinase-independent signalling system operates in plants, and would provide a basis for establishment of a genetic screen for mutants, using the gene promoter linked to a reporter such as luciferase. The aim of this proposal is to discover any genes which are either activated or repressed by glucose AND by 3OMG and/or 6DOG, but not by mannitol (an osmotic control). The use of both 3OMG and 6DOG will help to identify non-specific effects of either. All substrates will first be analysed by HPLC to confirm that they are pure. Arabidopsis Col-0 seedlings will be grown in vitro for 7 days in the absence of sugars, then treated with 30 mM glucose or glucose analogue for 8 h (these conditions are based on concentrations and time courses of Roitsch et al.). RNA will then be isolated from multiple independent plates to minimise biological variation.
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Slide Information:
Slide IDSlide NameGenetic BackgroundTissueStock CodeCel File
Villadsen_A-1_zer_Rep1_ATH1335the entire seedlings N1093Villadsen_A-1_zer_Rep1_ATH1.cel
Villadsen_A-2_wat_Rep1_ATH1336the entire seedlings N1093Villadsen_A-2_wat_Rep1_ATH1.cel
Villadsen_A-3_glc_Rep1_ATH1337the entire seedlings N1093Villadsen_A-3_glc_Rep1_ATH1.cel
Villadsen_A-4_OMG_Rep1_ATH1338the entire seedlings N1093Villadsen_A-4_OMG_Rep1_ATH1.cel
Villadsen_A-5_DOG_Rep1_ATH1339the entire seedlings N1093Villadsen_A-5_DOG_Rep1_ATH1.cel
Villadsen_A-6_man_Rep1_ATH1340the entire seedlings N1093Villadsen_A-6_man_Rep1_ATH1.cel