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Acta Prataculturae Sinica ›› 2023, Vol. 32 ›› Issue (8): 176-185.DOI: 10.11686/cyxb2022369

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Cloning of TB1 from Hordeum bogdanii and the effect of endophytic fungi on its expression

Dan HAN1,3(), Feng LONG1, Sheng CHEN1, Meng-fei HU1, Dong WANG2, Shui-hong CHEN1()   

  1. 1.School of Life Science and Technology,Tarim University,Key Laboratory of Tarim Basin Biological Resources Conservation and Utilization Corps,Alaer 843300,China
    2.School of Animal Science and Technology,Tarim University,Alaer 843300,China
    3.Shenzhen Institute of Advanced Technology,Chinese Academy of Sciences,Shenzhen 518055,China
  • Received:2022-09-15 Revised:2022-10-17 Online:2023-08-20 Published:2023-06-16
  • Contact: Shui-hong CHEN

Abstract:

The tillers of the Poaceous crop plant Hordeum bogdanii develop from non-elongating internodes at the base of the stem, form adventitious roots, and can survive independently of the main stem. The yield of H. bogdanii is mainly increased by tillering, which is regulated by both endophytic fungi and genes of the host. To explore the effect of endophytic fungi on the tiller-related gene TB1 in the host plant, the TB1 gene of H. bogdanii was cloned by RT-PCR, sequenced, and then analyzed using bioinformatic methods. The transcript levels of TB1 were determined by PCR using SYBR Green fluorescent dye. These PCR analyses were conducted for H. bogdanii with endophytic fungi (E+) and without endophyte fungi (E-) growing in Wensu County, Xinjiang and Tsaidam Basin, Qinghai. The full-length coding sequence of the TB1 gene clonedfrom H. bogdanii was 804 bp, encoding a polypeptide consisting of 267 amino acid residues. The TB1 gene had no promoter and did not encode a polyA tail. A subcellular localization analysis predicted that TB1 localizes in the vacuole. The TB1 protein, which belongs to the TCP family, has no transmembrane domains and no signal peptide, so it is not a transmembrane protein. It was predicted to be an unstable protein. The TB1 gene of H. bogdanii showed the highest homology (96.72%) with TB1 of Hordeum vulgare subsp., and was located in the same branch as TB1 from H. vulgare subsp. in the phylogenetic tree. The transcript profiles of TB1 in the roots, stems, and leaves were similar between plants growing in Wensu County and those growing in the Tsaidam Basin. Endophytic fungi significantly reduced the expression of TB1 at the base of stems (the tillering site). These results show that endophytic fungal infection affects the expression of the host’s TB1 gene, thereby regulating tillering. These findings provide a theoretical foundation for further research on the tillering mechanism of H. bogdanii.

Key words: endophytic fungi, Hordeum bogdanii, TB1, quantitative real-time PCR