Abstract
Rising demand for food and bioenergy makes it imperative to breed for increased crop
yield. Vegetative plant growth could be driven by resource acquisition
or developmental programs. Metabolite profiling in 94 Arabidopsis
accessions revealed that biomass correlates negatively with many
metabolites, especially starch. Starch accumulates in the light and is
degraded at night to provide a sustained supply of carbon for growth.
Multivariate analysis revealed that starch is an integrator of the overall
metabolic response. We hypothesized that this reflects variation in
a regulatory network that balances growth with the carbon supply.
Transcript profiling in 21 accessions revealed coordinated changes of
transcripts of more than 70 carbon-regulated genes and identified 2 genes
(myo-inositol-1-phosphate synthase, a Kelch-domain protein) whose
transcripts correlate with biomass. The impact of allelic variation at
these 2 loci was shown by association mapping, identifying them as
candidate lead genes with the potential to increase biomass production.
- 17217462
- alleles,
- analysis,
- arabidopsis,
- base
- carbohydrate
- chromosome
- data,
- developmental,
- energy
- expression
- gene
- genetic
- least-squares
- mapping,
- metabolism,
- molecular
- networks,
- plant,
- profiling,
- regulation,
- regulatory
- sequence
- sequence,
- starch,
- variation,
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