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Tea oil tree ( Camellia oleifera , Co) provides a fine edible oil source in China. Tea oil from the seeds is very beneficial to human health. Fructose-1,6-bisphosphate aldolase (FBA) hydrolyzes fructose-1,6-bisphosphate into dihydroxyacetone phosphate and glyceraldehyde 3-phosphate, two critical metabolites for oil biosynthesis. The objectives of this study were to identify FBA genes and investigate the relationship between FBA gene expression and oil content in developing seeds of tea oil tree. In this paper, four developmentally up-regulated  CoFBA  genes were identified in  Camellia oleifera  seeds based on the transcriptome from two seed developmental stages corresponding to the initiation and peak stages of lipid biosynthesis. The expression of  CoFBA  genes, along with three key oil biosynthesis genes  CoACP ,  CoFAD2  and  CoSAD  were analyzed in seeds from eight developmental stages by real-time quantitative PCR. The oil content and fatty acid composition were also analyzed. The results showed that  CoFBA  and  CoSAD  mRNA levels were well-correlated with oil content whereas  CoFAD2  gene expression levels were correlated with fatty acid composition in  Camellia  seeds. We propose that  CoFBA  and  CoSAD  are two important factors for determining tea oil yield because  CoFBA  gene controls the flux of key intermediates for oil biosynthesis and  CoSAD  gene controls the synthesis of oleic acid, which accounts for 80% of fatty acids in tea oil. These findings suggest that tea oil yield could be improved by enhanced expression of  CoFBA  and  CoSAD  genes in transgenic plants.

plos one

Identification and Expression of Fructose-1,6-Bisphosphate Aldolase Genes and Their Relations to Oil Content in Developing Seeds of Tea Oil Tree (Camellia oleifera)