Abstract
The plastid inner envelope membrane-bond nucleotide triphosphate transporter (NTT) transports cytosolic adenosine triphosphate (ATP) into plastid, which is necessary for the biochemical activities in plastid. We identified a chloroplast-localized BnaC08.NTT2 and obtained the overexpressed lines of BnaC08.NTT2 and CRISPR/Cas9 edited double mutant lines of BnaC08.NTT2 and BnaA08.NTT2 in B. napus. Further studies certified that overexpression (OE) of BnaC08.NTT2 could help transport ATP into chloroplast and exchange adenosine diphosphate (ADP) and this process was inhibited in BnaNTT2 mutants. Additional results showed that the thylakoid was abnormal in a8 c8 double mutants, which also had lower photosynthetic efficiency, leading to retarded plant growth. The BnaC08.NTT2 OE plants had higher photosynthetic efficiency and better growth compared to WT. OE of BnaC08.NTT2 could improve carbon flowing into protein and oil synthesis from glycolysis both in leaves and seeds. Lipid profile analysis showed that the contents of main chloroplast membrane lipids, including monogalactosyldiacylglycerol (MGDG), digalactosyldiacylglycerol (DGDG), and phosphatidylglycerol (PG), were significantly reduced in mutants, while there were no differences in OE lines compared to WT. These results suggest that BnaNTT2 is involved in the regulation of ATP/ADP homeostasis in plastid to impact plant growth and seed oil accumulation in B. napus.
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Acknowledgements
We are grateful to the Open Sharing Platform at Huazhong Agricultural University for the help with TEM and confocal laser scanning scope in this research.
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The work was supported by grant from the National Natural Science Foundation of China (31900908, 31871658).
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S.T. and L.G. designed this study. Y.H., H.X., X.L., R.F., Q.L., and Z.O. performed the experiments. Y.H. analyzed the data. Y.H. wrote the manuscript. S.T., L.G., S.L., X.L., and X.Y. revised the manuscript.
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**a, H., Hong, Y., Li, X. et al. BnaNTT2 regulates ATP homeostasis in plastid to sustain lipid metabolism and plant growth in Brassica napus. Mol Breeding 42, 54 (2022). https://doi.org/10.1007/s11032-022-01322-8
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DOI: https://doi.org/10.1007/s11032-022-01322-8