Table 1.

The bacterial strains used in the study

Straina	Isolated from	Referencesb
Azospirillum
Azospirillum sp. B510	Disinfected stem of O. sativa subsp. japonica (cv Nipponbare), Japan	Elbeltagy et al. (2001), Chamam et al. (2013)
A. brasilense Sp245	Surface-disinfected root of Triticum aestivum, Brazil	Baldani et al. (1986a), Valette et al. (2020)
A. lipoferum 4B	Rhizosphere of Oryza sativa subsp. japonica (cv Cigalon), France	Thomas-Bauzon et al. (1982), Chamam et al. (2013)
A. lipoferum B518	Disinfected stem of O. sativa subsp. indica rice (cv Kasalath), Japan	Elbeltagy et al. (2001), Valette et al. (2020)
A. lipoferum TVV3	Rhizosphere of O. sativa subsp. indica rice (cv IR64), Vietnam	Trân Vân et al. (1997), Valette et al. (2020)
A. lipoferum Sp59b	Undisinfected root of Triticum aestivum, Brazil	Tarrand et al. (1978), Valette et al. (2020)
A. lipoferum Br17	Undisinfected root of Zea mays, Brazil	Tarrand et al. (1978), Valette et al. (2020)
A. zeae N7	Rhizosphere of Zea mays, Canada	Mehnaz and Lazarovits (2006), Valette et al. (2020)
Other genera
Herbaspirillum seropedicae SmR1	Surface sterilized root of Sorghum bicolor	Baldani et al. (1986b)
Paraburkholderia phytofirmans PsJN	Surface sterilized root of Allium cepa	Sessitsch et al. (2005), Compant et al. (2005)
Burkholderia glumae AU6208	Clinical isolate, pathogenic on rice	Devescovi et al. (2007)

^aAll strains used (except B. glumae AU6208) were labelled previously, either with egfp via introduction of pMP2444 (All Azospirillum strains) or by gfp via transposition (Herbaspirillum seropedicae SmR1 and Paraburkholderia phytofirmans PsJN)

^bThe last reference refers to the labelling