期刊
PLANT CELL REPORTS
卷 38, 期 1, 页码 25-35出版社
SPRINGER
DOI: 10.1007/s00299-018-2346-x
关键词
Branched-chain amino acid; Branched-chain amino acid transferase; Cucumber; CsBCATs; Flowering time
资金
- National Research Foundation of Korea
- Next-Generation Bio-Green 21 Program (Plant Molecular Breeding Center) of the Rural Development Administration, Republic of Korea [PJ01329601]
Key messageThe overexpression of CsBCATs promotes flowering in Arabidopsis by regulating the expression of flowering time genes.AbstractThe branched-chain amino acid transferases (BCATs) play an important role in the metabolism of branched-chain amino acids (BCAAs), such as isoleucine, leucine, and valine. They function in both the synthesis and the degradation of this class of amino acids. We identified and characterized the three BCAT genes in cucumber (Cucumis sativus L.). The tissue-specific expression profiling in cucumber plants revealed that CsBCAT2 and CsBCAT7 were highly expressed in the reproductive tissues, whereas CsBCAT3 expression was highly detected in the vegetative tissues. The subcellular localization patterns of three CsBCATs were observed in the mitochondria. The functional analyses of CsBCATs showed that CsBCAT2 and CsBCAT3 restored the growth of bat1/bat2 double knockout yeast (Saccharomyces cerevisiae), and CsBCAT3 and CsBCAT7 with different substrate preferences acted in a reverse reaction. The transgenic approach demonstrated that the overexpression of the three CsBCATs resulted in early flowering phenotypes, which were associated with the upregulation of FLOWERING LOCUS T (FT) and SUPPRESSOR OF OVEREXPRESSION OF CONSTANS1 (SOC1) in a manner in which they were dependent on GIGANTEA (GI)/CONSTANS (CO) and SHORT VEGETATIVE PHASE (SVP)/FLOWERING LOCUS C (FLC) modules. Our results, which are observed in conjunction, suggest that there is an interconnection between BCAT genes that function in BCAA metabolism and the flowering time in plants.
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