Arbuscular mycorrhiza reduces susceptibility of tomato to Alternaria solani.

Mycorrhiza
Maendy FritzJörn Pons-Kühnemann

Abstract

Mycorrhiza frequently leads to the control of root pathogens, but appears to have the opposite effect on leaf pathogens. In this study, we studied mycorrhizal effects on the development of early blight in tomato (Solanum lycopersicum) caused by the necrotrophic fungus Alternaria solani. Alternaria-induced necrosis and chlorosis of all leaves were studied in mycorrhizal and non-mycorrhizal plants over time course and at different soil P levels. Mycorrhizal tomato plants had significantly less A. solani symptoms than non-mycorrhizal plants, but neither plant growth nor phosphate uptake was enhanced by mycorrhizas. An increased P supply had no effect on disease severity in non-mycorrhizal plants, but led to a higher disease severity in mycorrhizal plants. This was parallel to a P-supply-induced reduction in mycorrhiza formation. The protective effect of mycorrhizas towards development of A. solani has some parallels to induced systemic resistance, mediated by rhizobacteria: both biocontrol agents are root-associated organisms and both are effective against necrotrophic pathogens. The possible mechanisms involved are discussed.

References

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Citations

Nov 11, 2010·Mycorrhiza·Dietmar SchwarzMargitta Worm
May 25, 2012·Journal of Chemical Ecology·Sabine C JungMaria J Pozo
Jul 23, 2013·Trends in Plant Science·Duncan D CameronJurriaan Ton
Feb 7, 2013·Journal of Experimental Botany·Dale R WaltersNeil D Havis
Oct 23, 2010·PloS One·Yuan Yuan SongWoldemariam Gebrehiwot Yihdego
Mar 5, 2016·BioMed Research International·Marjorie Bonareri Oruru, Ezekiel Mugendi Njeru
Sep 9, 2009·Trends in Plant Science·Matthias ErbTed C J Turlings
Jul 31, 2007·Current Opinion in Plant Biology·María J Pozo, Concepción Azcón-Aguilar
Feb 13, 2019·Molecular Plant-microbe Interactions : MPMI·Michael BachtMartin Schädler
Apr 1, 2017·Functional Plant Biology : FPB·Ghalia MustafaAnissa Lounès-Hadj Sahraoui
Aug 9, 2017·Frontiers in Microbiology·Katherine E French
Jun 25, 2019·Frontiers in Microbiology·Laura MiozziLuisa Lanfranco
Sep 19, 2020·Physiology and Molecular Biology of Plants : an International Journal of Functional Plant Biology·Sandeep KaushikSuman Lakhanpaul
Oct 7, 2015·Frontiers in Plant Science·Yuanyuan SongRensen Zeng
Dec 5, 2020·Pakistan Journal of Biological Sciences : PJBS·Aniefiok Effiong UkoJessica Eno Effiong
Jul 9, 2021·Environmental Science and Pollution Research International·Shirin Parizad, Sayanta Bera

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