Long-chain acyl-CoA synthetase 2 is involved in seed oil production in Brassica napus

Li Na Ding, Shou Lai Gu, Fu Ge Zhu, Zhong Yan Ma, Juan Li, Ming Li, Zheng Wang, Xiao Li Tan

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

Background: Triacylglycerols (TAGs) are the main composition of plant seed oil. Long-chain acyl-coenzyme A synthetases (LACSs) catalyze the synthesis of long-chain acyl-coenzyme A, which is one of the primary substrates for TAG synthesis. In Arabidopsis, the LACS gene family contains nine members, among which LACS1 and LACS9 have overlapping functions in TAG biosynthesis. However, functional characterization of LACS proteins in rapeseed have been rarely reported. Results: An orthologue of the Arabidopsis LACS2 gene (BnLACS2) that is highly expressed in developing seeds was identified in rapeseed (Brassica napus). The BnLACS2-GFP fusion protein was mainly localized to the endoplasmic reticulum, where TAG biosynthesis occurs. Interestingly, overexpression of the BnLACS2 gene resulted in significantly higher oil contents in transgenic rapeseed plants compared to wild type, while BnLACS2-RNAi transgenic rapeseed plants had decreased oil contents. Furthermore, quantitative real-time PCR expression data revealed that the expression of several genes involved in glycolysis, as well as fatty acid (FA) and lipid biosynthesis, was also affected in transgenic plants. Conclusions: A long chain acyl-CoA synthetase, BnLACS2, located in the endoplasmic reticulum was identified in B. napus. Overexpression of BnLACS2 in yeast and rapeseed could increase oil content, while BnLACS2-RNAi transgenic rapeseed plants exhibited decreased oil content. Furthermore, BnLACS2 transcription increased the expression of genes involved in glycolysis, and FA and lipid synthesis in developing seeds. These results suggested that BnLACS2 is an important factor for seed oil production in B. napus.

Original languageEnglish
Article number21
JournalBMC Plant Biology
Volume20
Issue number1
DOIs
StatePublished - 13 Jan 2020
Externally publishedYes

Keywords

  • BnLACS2
  • Fatty acids
  • Glycolysis
  • Lipid
  • Oil contents
  • Rapeseed (Brassica napus)

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