Only a small subset of the SPRY domain gene family in Globodera pallida is likely to encode effectors, two of which suppress host defences induced by the potato resistance gene Gpa2

Yuanyuan Mei, Peter Thorpe, Athanas Guzha, Annelies Haegeman, Vivian C. Blok, Katrin MacKenzie, Godelieve Gheysen, John T. Jones, Sophie Mantelin*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

Analysis of the genome sequence of the potato cyst nematode, Globodera pallida, has shown that a substantial gene family (approximately 300 sequences) of proteins containing a SPRY domain is present in this species. This is a huge expansion of the gene family as compared to other organisms, including other plant-parasitic nematodes. Some SPRY domain proteins from G. pallida and G. rostochiensis have signal peptides for secretion and are deployed as effectors. One of these SPRYSEC proteins has been shown to suppress host defence responses. We describe further analysis of this gene family in G. pallida. We show that only a minority (10%) of the SPRY domain proteins in this species have a predicted signal peptide for secretion and that the presence of a signal peptide is strongly correlated with the corresponding gene being expressed at the early stages of parasitism. The data suggest that while the gene family is greatly expanded, only a minority of SPRY domain proteins in G. pallida are SPRYSEC candidate effectors. We show that several new SPRYSECs from G. pallida are expressed in the dorsal gland cell and demonstrate that some, but not all, of the SPRYSECs can suppress the hypersensitive response induced by co-expression of the resistance gene Gpa2 and its cognate avirulence factor RBP-1 in Nicotiana benthamiana.

Original languageEnglish
Pages (from-to)409-424
Number of pages16
JournalNematology
Volume17
Issue number4
Early online date25 Feb 2015
DOIs
Publication statusPublished - 2015

Keywords

  • Dorsal pharyngeal gland
  • Gpa2 gene
  • Hypersensitive response
  • Parasitism
  • Plant cell death
  • SPRYSEC protein

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