Soilborne fungi on tomato: metabolite dynamics and root exudate mediated interactions in monoculture and intercropping systems
Abstract
Plants are dynamic and highly sensitive organisms, which communicate with their environment in a complex fashion. Our understanding of plant–plant and plant–microbe interactions has increased to a great extent, yet the signal communication is still far from being satisfactorily understood. To add to the complexity, linkages between below- and aboveground physiological processes within a plant as well as facilitation and inhibition by adjacent plants are known to occur. Shortly after germination, the developing seedlings are colonized by a wide range of microorganisms that may cause either beneficial or antagonistic effects on their host. The importance of plant metabolites is apparent in these processes; they may significantly contribute to pathogen resistance and, in addition, comprise compounds determining the color, taste and odor of fruits. Moreover, some secondary metabolites that are especially accumulated in fruits may also act as antioxidants and thus exert beneficial effects to the health of the consumers by decreasing the risks of cancer and cardiovascular diseases. Consequently, they are also regarded as criteria for crop quality. We intend to elucidate the plant response in a biological system consisting of a crop plant and a beneficial and pathogenic soil fungus in monoculture and mixed cultivation. Out of the multitude of possible interactions we will focus on the chosen model system, which comprises tomato, the arbuscular mycorrhizal fungus Glomus mosseae and the soil borne tomato pathogen Fusarium oxysporum sp. lycopersici. The effects of single and combined inoculations as well as various combinations of co-culture of tomato with plants, which are either known to be stimulative or repressive for tomato, will be studied. We hypothesize that specific effects of (1) plant pathogenic and mycorrhizal fungi on metabolite profiles in the tissues and root exudates of their host plant, (2) root exudates, pathogenic and mycorrhizal fungi on the development of soil borne fungi in the rhizosphere, and (3) adjacent plants on the metabolite profiles of above- and belowground tomato organs as well as on the root exudates, which cause specific feedbacks on the development of fungal colonization, will occur. The proposed research will provide improved insights about metabolic dynamics in leaves, roots, and root exudates of tomato. The extent of correlation of any detected changes in the metabolite profiles in various organs of tomato to the inoculation with a specific mycorrhizal and pathogenic fungus, or a combination of both will be explored. Additionally, effects of intercropped plants, both with stimulating and inhibitory effects, on the variability of chemical profiles of the model plant will be characterized for the first time. Moreover, we will provide new information how much fruit quality (an aboveground character) fruit is affected by root colonization by pathogenic and symbiotic root fungi.
pathogenic fungi mycorrhiza metabolite profiling root exudate tomato
Publikationen
Changes in root exudate composition mediated by pathogenic and mycorrhizal fungi in tomato (Solanum lycopersicum L.)
Autoren: Hage-Ahmed K., Chobot V., Postl W., Voglgruber A., Hadacek F., Steinkellner S. Jahr: 2009
Conference & Workshop proceedings, paper, abstract
Alteration of plant metabolites and root exudate-mediated interactions by pathogenic and mycorrhizal fungi in tomato
Autoren: Hage-Ahmed K., Chobot V., Postl W., Voglgruber A., Hadacek F., Steinkellner S. Jahr: 2009
Conference & Workshop proceedings, paper, abstract
The effect of Fusarium oxysporum f.sp. lycopersici and the arbuscular mycorrhizal fungus Glomus mossaes on tomato (Solanum lycopersicum L.) intercropped with cucumber (Cucumis sativus L.)
Autoren: Hage-Ahmed, K., Chobot, V., Voglgruber, A., Hadecek, F., Steinkellner, S. Jahr: 2010
Conference & Workshop proceedings, paper, abstract
Alteration of root morphology of tomato roots due to Fusarium oxysporum f. sp. lycopersici, arbuscular mycorrhizal fungi and phosphorous supply
Autoren: Horner, A., Hage-Ahmed, K., Langer, I., Steinkellner, S. Jahr: 2010
Conference & Workshop proceedings, paper, abstract
Root exudate-mediated effects of arbuscular mycorrhizal fungi on the soil-borne tomato pathogen Fusarium oxysporum f. sp. lycopersici
Autoren: Hage-Ahmed, K; Moyses, A; Voglgruber, V; Hadacek, F; Steinkellner, S Jahr: 2013
Conference & Workshop proceedings, paper, abstract
Compost and Biochar alter root exudation and root morphology in Fusarium oxysporum infected tomato plants
Autoren: Steinkellner, S. Hage-Ahmed, K., Akhter A., Morauf, C. Jahr: 2015
Conference & Workshop proceedings, paper, abstract
Project staff
Siegrid Steinkellner
Univ.Prof. Dipl.-Ing. Dr.nat.techn. Siegrid Steinkellner
siegrid.steinkellner@boku.ac.at
Tel: +43 1 47654-95001, 95301, 95302
Project Leader
01.10.2008 - 28.02.2013
Karin Hage-Ahmed
Dipl.-Ing. Dr. Karin Hage-Ahmed
karin.hageahmed@boku.ac.at
Tel: +43 1 47654-95305
Project Staff
01.10.2008 - 28.02.2013
BOKU partners
External partners
University Vienna, Department of Chemical Ecology and Ecosystem Research
Ao. Prof. Dr. Franz Hadacek
partner