Shan Tang, Ning Guo, Qingqing Tang, Fei Peng, Yunhao Liu, Hui Xia, Shaoping Lu, Liang Guo

Plant Biotechnology Journal, First Published: 02 September 2022

【英文摘要】

BILE ACID: SODIUM SYMPORTER FAMILY PROTEIN 2 (BASS2) is a sodium dependent pyruvate transporter which transports pyruvate from cytosol into plastid in plants. In this study, we investigated the function of chloroplast envelope membrane-localized BnaBASS2 in seed metabolism and seed oil accumulation of Brassica napus (B. napus). Four BASS2 genes were identified in the genome of B. napus. BnaA05.BASS2 was overexpressed while BnaA05.BASS2 and BnaC04.BASS2-1 were mutated by CRISPR in B. napus. Metabolite analysis revealed that manipulation of BnaBASS2 caused significant changes in glycolysis-, fatty acid synthesis- and energy-related metabolites in the chloroplasts of 31 day-after-flowering (DAF) seeds. The analysis of fatty acids and lipids in developing seeds showed that BnaBASS2 could affect lipid metabolism and oil accumulation in developing seeds. Moreover, overexpression (OE) of BnaA05.BASS2 could promote the expression level of multiple genes involved in the synthesis of oil and formation of oil body during seed development. Disruption of BnaA05.BASS2 and BnaC04.BASS2-1 resulted in decreasing of the seed oil content (SOC) by 2.8% to 5.0%, while OE of BnaA05.BASS2 significantly promoted the SOC by 1.4% to 3.4%. Together, our results suggest that BnaBASS2 is a potential target gene for breeding B. napus with high SOC.

论文链接：https://onlinelibrary.wiley.com/doi/abs/10.1111/pbi.13922