Mycorrhiza-induced changes in disease severity and PR protein expression in tobacco leaves

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Mycorrhiza-induced changes in disease severity and PR protein expression in tobacco leaves

Year: 

1999

Source of publication :

Molecular Plant-Microbe Interactions

Authors :

Elad, Yigal

;

Galili, Shmuel

;

Ginzberg, Idit

;

Kapulnik, Yoram

;

Shaul, Orna

;

Volpin, Hanne

.

Volume :

Co-Authors: 

Shaul, O., Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Galili, S., Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Volpin, H., Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Ginzberg, I., Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Elad, Y., Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Chet, I., Dept. Plant Pathol. and Microbiol., Faculty of Agriculture, Hebrew University of Jerusalem, Rehovot 76100, Israel
Kapulnik, Y., Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel, Agronomy and Natural Resources, ARO, Volcani Center, Bet Dagan 50250, Israel

From page: 

1000

To page: 

1007

(

Total pages: 

8

)

Link :

Mycorrhiza-induced changes in disease severity and PR protein expression in tobacco leaves

Abstract: 

The development of leaf disease symptoms and the accumulation of pathogenesis-related (PR) proteins were monitored in leaves of tobacco (Nicotiana tabacum cv. Xanthinc) 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.