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Jatropha curcas has been widely studied at the molecular level due to its potential as an alternative source of fuel. Many of the reports till date on this plant have focussed mainly on genes contributing to the accumulation of oil in its seeds. A suppression subtractive hybridization strategy was employed to identify genes which are differentially expressed in the mid maturation stage of J. curcas seeds. Random expressed sequence tag sequencing of the cDNA subtraction library resulted in 385 contigs and 1,428 singletons, with 591 expressed sequence tags mapping for enzymes having catalytic roles in various metabolic pathways. Differences in transcript levels in early and mid-to-late maturation stages of seeds were also investigated using sequence information obtained from the cDNA subtraction library. Seven out of 12 transcripts having putative roles in central carbon metabolism were up regulated in early seed maturation stage while lipid metabolism related transcripts were detected at higher levels in the later stage of seed maturation. Interestingly, 4 of the transcripts revealed putative alternative splice variants that were specifically present or up regulated in the early or late maturation stage of the seeds. Transcript expression patterns from the current study using maturing seeds of J. curcas reveal a subtle balancing of oil accumulation and utilization, which may be influenced by their energy requirements.

Differential expression analysis of transcripts related to oil metabolism in maturing seeds of Jatropha curcas L.