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Fig. 4 | BMC Plant Biology

Fig. 4

From: An integrated omics analysis reveals molecular mechanisms that are associated with differences in seed oil content between Glycine max and Brassica napus

Fig. 4

Molecular mechanisms for the difference of seed oil content between soybean and rapeseed. Candidate genes contributed to the differences of seed oil content between soybean and rapeseed obtained in the study were marked with red color. GRF2 and RBCS1A: photosynthesis; PGK, ApS1, SUC, PEPC and PKp: carbon metabolism from sucrose to pyruvate; PDK1, ACCase, KASII, HAD, KAR, FATA, SAD and FAD2: in de novo fatty acid biosynthesis; PAP and PDCT: TAG synthesis; OBO, CALO and STERO: oil-body protein genes; LOX, LAH, HSI2 and DSEL: oil degradation genes. Among these candidate genes, BCCP1 (BnaA03g06000D) and β-CT (BnaC05g37990D) in heterogeneous acetyl-CoA carboxylase (ACCase) are rapeseed-specific genes, and β-CT is positively regulated by four transcription factors (BnaA01g37250D, BnaA02g26190D, BnaC01g01040D and BnaC07g21470D). The gene expression of PEPC1 in rapeseed is putatively inhibited by bna-miR169, while LPAAT in soybean putatively inhibited by gma-miR171, gma-miR1516 and gma-miR5775 in triglyceride synthesis. The pink genes are speculated related specifically to high seed oil content of rapeseeds, and the purple speculated specifically related to high seed protein content in soybean, which were both identified by PEPC co-expression network analysis. Soybean genes participated in Branched-Chain Amino Acid (BCAA) synthesis may contribute to seed high protein content by adjusting the flow of PEP and downstream protein biosynthesis. Rapeseed genes BnSTKA and BnCKII are likely to promote the triglyceride synthesis by phosphorylating circadian TFs cca1/lhy and thus increase the seed oil content of rapeseed

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