Phytohormone Profiles Induced by Trichoderma Isolates Correspond with Their Biocontrol and Plant Growth-Promoting Activity on Melon Plants

The application of Trichoderma strains with biocontrol and plant growth-promoting capacities to plant substrates can help reduce the input of chemical pesticides and fertilizers in agriculture. Some Trichoderma isolates can directly affect plant pathogens, but they also are known to influence the ph...

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Veröffentlicht in:Journal of chemical ecology 2014-07, Vol.40 (7), p.804-815
Hauptverfasser: Martínez-Medina, Ainhoa, Del Mar Alguacil, Maria, Pascual, Jose A, Van Wees, Saskia C.M
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container_end_page 815
container_issue 7
container_start_page 804
container_title Journal of chemical ecology
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creator Martínez-Medina, Ainhoa
Del Mar Alguacil, Maria
Pascual, Jose A
Van Wees, Saskia C.M
description The application of Trichoderma strains with biocontrol and plant growth-promoting capacities to plant substrates can help reduce the input of chemical pesticides and fertilizers in agriculture. Some Trichoderma isolates can directly affect plant pathogens, but they also are known to influence the phytohormonal network of their host plant, thus leading to an improvement of plant growth and stress tolerance. In this study, we tested whether alterations in the phytohormone signature induced by different Trichoderma isolates correspond with their ability for biocontrol and growth promotion. Four Trichoderma isolates were collected from agricultural soils and were identified as the species Trichoderma harzianum (two isolates), Trichoderma ghanense, and Trichoderma hamatum. Their antagonistic activity against the plant pathogen Fusarium oxysporum f. sp. melonis was tested in vitro, and their plant growth-promoting and biocontrol activity against Fusarium wilt on melon plants was examined in vivo, and compared to that of the commercial strain T. harzianum T-22. Several growth- and defense-related phytohormones were analyzed in the shoots of plants that were root-colonized by the different Trichoderma isolates. An increase in auxin and a decrease in cytokinins and abscisic acid content were induced by the isolates that promoted the plant growth. Principal component analysis (PCA) was used to evaluate the relationship between the plant phenotypic and hormonal variables. PCA pointed to a strong association of auxin induction with plant growth stimulation by Trichoderma. Furthermore, the disease-protectant ability of the Trichoderma strains against F. oxysporum infection seems to be more related to their induced alterations in the content of the hormones abscisic acid, ethylene, and the cytokinin trans-zeatin riboside than to the in vitro antagonism activity against F. oxysporum.
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Several growth- and defense-related phytohormones were analyzed in the shoots of plants that were root-colonized by the different Trichoderma isolates. An increase in auxin and a decrease in cytokinins and abscisic acid content were induced by the isolates that promoted the plant growth. Principal component analysis (PCA) was used to evaluate the relationship between the plant phenotypic and hormonal variables. PCA pointed to a strong association of auxin induction with plant growth stimulation by Trichoderma. 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Some Trichoderma isolates can directly affect plant pathogens, but they also are known to influence the phytohormonal network of their host plant, thus leading to an improvement of plant growth and stress tolerance. In this study, we tested whether alterations in the phytohormone signature induced by different Trichoderma isolates correspond with their ability for biocontrol and growth promotion. Four Trichoderma isolates were collected from agricultural soils and were identified as the species Trichoderma harzianum (two isolates), Trichoderma ghanense, and Trichoderma hamatum. Their antagonistic activity against the plant pathogen Fusarium oxysporum f. sp. melonis was tested in vitro, and their plant growth-promoting and biocontrol activity against Fusarium wilt on melon plants was examined in vivo, and compared to that of the commercial strain T. harzianum T-22. Several growth- and defense-related phytohormones were analyzed in the shoots of plants that were root-colonized by the different Trichoderma isolates. An increase in auxin and a decrease in cytokinins and abscisic acid content were induced by the isolates that promoted the plant growth. Principal component analysis (PCA) was used to evaluate the relationship between the plant phenotypic and hormonal variables. PCA pointed to a strong association of auxin induction with plant growth stimulation by Trichoderma. 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subjects abscisic acid
Abscisic Acid - metabolism
Agricultural land
agricultural soils
Agriculture
Agrochemicals
auxins
Biochemistry
Biological control
Biological Microscopy
Biomedical and Life Sciences
Chemical ecology
Cucurbitaceae - growth & development
Cucurbitaceae - metabolism
Cucurbitaceae - microbiology
cytokinins
Cytokinins - metabolism
Ecology
Entomology
ethylene
fertilizers
Fusarium - physiology
Fusarium oxysporum
Fusarium wilt
growth promotion
Hormones
host plants
Hypocrea lixii
Indoleacetic Acids - metabolism
Life Sciences
Melonis
melons
Pathogens
Pesticides
Phenotype
Phylogeny
Plant growth
Plant Growth Regulators - metabolism
plant pathogens
Plant Roots - metabolism
Plant Roots - microbiology
Plant Shoots - metabolism
Principal Component Analysis
Principal components analysis
shoots
Soil Microbiology
stress tolerance
Trichoderma - classification
Trichoderma - isolation & purification
Trichoderma - physiology
Trichoderma ghanense
Trichoderma hamatum
title Phytohormone Profiles Induced by Trichoderma Isolates Correspond with Their Biocontrol and Plant Growth-Promoting Activity on Melon Plants
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