Table 2. Induction of StPT3 expression in potato inoculated with fungi from different taxonomic positions.

Taxonomic position (kingdom/phylum/order/family)†		Fungal species	Fungal status	GUS activity‡	Mycorrhiza type (only for AMF)§
Oomycota		Phytophthora infestans	Pathogen	—, ms
Fungi
Zygomycota		Rhizopus stolonifer	Pathogen	—, ms
Glomeromycota
Paraglomerales		Paraglomus brasilianum	—	+, s	P; ah, ch
Archaeosporales		Archaeospora nicolsonii	—	+, s	P; ch
Diversisporales	Acaulosporaceae	Acaulospora delicata	—	+, s	P; ah, ch
	Diversisporaceae	Glomus spurcum	—	+, s	P; ah, ch
	Gigasporaceae	Gigaspora margarita	—	+, ms	P; ch
Glomerales	Glomeraceae (Glomus-group A)	Glomus caledonium	Mutualistic symbiont	+, ms	I; ah, ch, ih
		Glomus geosporum	—	+, s	I; ah, ch, ih
		Glomus intraradices	—	+, ms	I; a, ah, ch, ih
		Glomus mosseae	—	+, ms	I; a, ah, ch, ih
	Glomeraceae (Glomus-group B)	Glomus etunicatum	—	+, ms	P; ch
Basidiomycota
		Piriformospora indica	Plant growth-promoting endophyte	—, m	—
		Rhizoctonia solani	Pathogen	—, ms	—
		Binucleate Rhizoctonia sp.	Neutral endophyte	—, s	—
Ascomycota
		Nectria ventricosa	Pathogen	—, ms	—
		Phialocephala fortinii	Mutualistic symbiont to weak pathogen	—, m	—

Potato plants and/or hairy roots harboring the StPT3 promoter—GUS reporter gene construct were inoculated with 17 strains of root-colonizing organisms. GUS activity in colonized tissues corresponds to the induction of StPT3 expression. +, Positive GUS staining in root zones colonized by AMF; —, absence of GUS staining.

^* Systematics of AMF is given according to ref. 4

^†Order and family names are given only for AMF

^‡GUS activity assays were performed in monoxenic (m), soil (s), or in both cultures (ms)

^§Details of AM morphology: P, Paris-type AM; I, intermediate-type AM; a, arbuscules; ah, arbusculate hyphae; ch, coiled hyphae; ih, intercellular hyphae