DOI: https://doi.org/10.1016/j.plaphy.2024.109038

发表期刊：Plant Physiology and Biochemistry

链接：https://www.sciencedirect.com/science/article/pii/S098194282400706X?via%3Dihub#fig6

作者：Sainan Ma†, Yali Qi†, Jieyu Ma, Yang Wang, Guangyan Feng, Linkai Huang, Gang Nie*, Xinquan Zhang*

Abstract:

Anthocyanins and proanthocyanidins (PAs) are important secondary metabolites in plants, high contents of which are an important goal for quality breeding of white clover (Trifolium repens). However, the involvement of glutathione S-transferase (GST) in the transport of anthocyanins and PAs remains unexplored in white clover. This study identified 153 different TrGSTs in white clover. At the transcriptional level, compared to other TrGSTFs, TrGSTF10 and TrGSTF15 are highly expressed in the‘Purple’white clover, and they may work with the anthocyanin biosynthesis structural genes CHS and CHI to contribute to pigment buildup in white clover. Subcellular localization confirmed that TrGSTF10 and TrGSTF15 are located in the cytoplasm. Additionally, molecular docking experiments showed that TrGSTF10 and TrGSTF15 have similar binding affinity with two flavonoid monomers. Overexpression of TrGSTF15 complemented the deficiency of anthocyanin coloring and PA accumulation in the Arabidopsis tt19 mutant. The initial findings of this research indicate that TrGSTF15 encodes an important transporter of anthocyanin and PA in white clover, thus providing a new perspective for the further exploration of related transport and regulatory mechanisms.

Keywords

Anthocyanins；GST gene family；proanthocyanidins；TrGSTF15；white clover