Acta Agriculturae Boreali-Sinica ›› 2022, Vol. 37 ›› Issue (4): 45-52. doi: 10.7668/hbnxb.20192931

Special Issue: Biotechnology

• Crop Genetics & Breeding·Germplasm Resources·Biotechnology • Previous Articles     Next Articles

Cloning and Analysis of a Polygalacturonase Inhibiting Protein Gene and Its Promoter from Lilium regale Wilson

DENG Jie, WANG Hanlin, LI Youyu, WANG Zie, CHEN Xiaohua, LIU Diqiu   

  1. Faculty of Life Science and Technology,Kunming University of Science and Technology,Kunming 650500,China
  • Received:2022-03-09 Published:2022-08-28
  • Contact: LIU Diqiu

Abstract:

Polygalacturonase-inhibiting proteins(PGIPs)play an important role during response to pathogen infection.A PGIP gene and its promoter were isolated from Lilium regale Wilson,which has strong resistance to Fusarium oxysporum.The open reading frame of LrPGIP was 1 008 bp in length,which encoded a protein with a length of 335 amino acid residues and contained 7 leucine-rich repeat domains.LrPGIP had high homology with PGIP of Elaeis guineensis,Cocos nucifera and Nicotiana sylvestris,which was 91%,94% and 86%,respectively.The LrPGIP showed closer relation with Phoenix dactylifera,Ensete ventricosum,E.guineensis and C.nucifera.LrPGIP was expressed in roots,stems,leaves,flowers and scales.It had the highest expression level in roots and the lowest expression level in scales.The expression level of LrPGIP was induced by F.oxysporum,and the highest expression level was at 72 h after F.oxysporum infection.The plant signal molecules including salicylic acid(SA),jasmonic acid(JA),ethephon(ETH)and hydrogen peroxide induced the expression of LrPGIP.Among them,the expression level of LrPGIP induced by ETH was the highest,which was followed by JA.The length of LrPGIP promoter fragment was 706 bp and had some cis-acting elements,such as hormone and stress responding elements.The expression cassette of the β-glucuronidase(GUS)driven by the LrPGIP promoter was transferred into tobacco for expression,and the GUS activity was obviously induced by the infection of F.oxysporum and Alternaria alternata as well as the stress of HgCl2 and NaCl.It also responded to defense-related plant hormones including JA,SA and ETH.The up-regulation of GUS activity by HgCl2 treatment was the greatest,followed by A.alternata and ETH.These data showed that the LrPGIP promoter activity was induced by plant hormones,biotic and abiotic stresses.The above results indicated that LrPGIP might be an important disease resistance gene in L.regale against F.oxysporum.

Key words: Lilium regale Wilson, Polygalacturonase-inhibiting proteins, Expression characteristics, Promoter activity

Cite this article

DENG Jie, WANG Hanlin, LI Youyu, WANG Zie, CHEN Xiaohua, LIU Diqiu. Cloning and Analysis of a Polygalacturonase Inhibiting Protein Gene and Its Promoter from Lilium regale Wilson[J]. Acta Agriculturae Boreali-Sinica, 2022, 37(4): 45-52. doi: 10.7668/hbnxb.20192931.

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