Molecular Plant-Microbe Interactions (1999) 12, 1000-1007

Orna Shaul, Shmuel Galili, Hanne Volpin, Idit Ginzberg, Yigal Elad, Ilan Chet and Yoram Kapulnik (1999)
Mycorrhiza-induced changes in disease severity and PR protein expression in tobacco leaves
Molecular Plant-Microbe Interactions 12 (11), 1000-1007
Abstract: The development of leaf disease symptoms and the accumulation of pathogenesis-related (PR) proteins were monitored in leaves of tobacco (Nicotiana tabacum cv. Xanthi-nc) plants colonized by the arbuscular mycorrhizal fungus Glomus intraradices. Leaves of mycorrhizal plants infected with the leaf pathogens Botrytis cinerea or tobacco mosaic virus showed a higher incidence and severity of necrotic lesions than those of nonmycorrhizal controls. Similar plant responses were obtained at both low (0.1 mM) and high (1.0 mM) nutritional P levels and with mutant plants (NahG) that are unable to accumulate salicylic acid. Application of PR-protein activators induced PR-1 and PR-3 expression in leaves of both nonmycorrhizal and mycorrhizal plants; however, accumulation and mRNA steady-state levels of these proteins were lower, and their appearance delayed, in leaves of the mycorrhizal plants. Application of 0.3 mM phosphate to the plants did not mimic the delay in PR expression observed in the mycorrhizal tobacco. Together, these data strongly support the existence of regulatory processes, initiated in the roots of mycorrhizal plants, that modify disease-symptom development and gene expression in their leaves.
(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): Yigal Elad

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
molecular biology - genes
general biology - morphology - evolution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Botrytis cinerea	Tobacco (Nicotiana tabacum)
	Tobacco mosaic virus	Tobacco (Nicotiana tabacum)
Rhizophagus intraradices (antagonist)	Botrytis cinerea	Tobacco (Nicotiana tabacum)
Rhizophagus intraradices (antagonist)	Tobacco mosaic virus	Tobacco (Nicotiana tabacum)