Plant Pathology (2011) 60, 1014-1022

R. D'Amelio, G. Berta, E. Gamalero, N. Massa, L. Avidano, S. Cantamessa, G. D'Agostino, D. Bosco and C. Marzachì (2011)
Increased plant tolerance against chrysanthemum yellows phytoplasma (´Candidatus Phytoplasma asteris') following double inoculation with Glomus mosseae BEG12 and Pseudomonas putida S1Pf1Rif
Plant Pathology 60 (6), 1014-1022
Abstract: The aim of this work was to assess the effects of a combined inoculum of a rhizobacterium and an arbuscular mycorrhizal (AM) fungus on plant responses to phytoplasma infection, and on phytoplasma multiplication and viability in Chrysanthemum carinatum plants infected by chrysanthemum yellows phytoplasma (CY). Combined inoculation with Glomus mosseae BEG12 and Pseudomonas putida S1Pf1Rif resulted in some resistance to phytoplasma infection (about 30%), delayed symptom expression in nonresistant plants, improved growth of the aerial part of the infected plants (+68·1%), and altered root morphology (root tip number: +49·9%; branching degree: +82·8%). Combined inoculation with the two beneficial microorganisms did not alter CY multiplication and viability. In inoculated and infected plants, phytoplasma morphology was typical of senescent cells. A more active and efficient root system in double-inoculated plants probably mediated the effects of the two rhizospheric microorganisms in the infected plants. The practical application of rhizospheric microorganisms for mitigating phytoplasma damage, following evaluation under field conditions, represents an additional tool for the integrated management of phytoplasmosis.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Cristina Marzachi, Domenico Bosco

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
application technology
general biology - morphology - evolution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Phytoplasma asteris	Chrysanthemum (genus)
Pseudomonas putida (antagonist)	Phytoplasma asteris	Chrysanthemum (genus)
Funneliformis mosseae (antagonist)	Phytoplasma asteris	Chrysanthemum (genus)