The Arabidopsis mutants designated gly1 exhibit a reduced carbon flux throu
gh the prokaryotic pathway that is compensated for by an increased carbon f
lux through the eukaryotic pathway. Biochemical approaches reveal that the
gly1 phenotype cannot be explained by a deficiency in the enzymes of the pr
okaryotic pathway. The chemical complementation of the mutant phenotype by
exogenous glycerol treatment of gly1 plants suggests a lesion affecting the
glycerol 3-phosphate supply within the chloroplast. As an alternative to t
he biochemical study of the gly1 mutants we set out to map the GLY1 locus.
The gly1 mutant being an EMS (ethyl methane sulphonate) mutant, we used a s
trategy based on the polymorphism existing between Arabidopsis ecotypes, he
re Columbia (gly1 background) and Landsberg erecta. We mapped gly1 on chrom
osome II. During the process of chromosome walking, the complete sequence o
f chromosome II was released, allowing us to make assumptions on candidate
genes based on map location. We are currently sequencing the putative genes
.