Enzyme regulation patterns in fungal inoculated wheat may reflect resistance and tolerance towards an insect herbivore

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Seed inoculation with entomopathogenic fungi (EPF) causes plant-mediated effects against arthropod herbivores, but the responses vary among EPF isolates. We used a wheat model system with three isolates representing Beauveria bassiana and Metarhizium spp. causing either negative or positive effects against the aphid Rhopalosiphum padi. Activities of six carbohydrate enzymes increased in plants showing biomass build-up after EPF inoculations. However, only aldolase activity showed positive correlation with R. padi numbers. Plants inoculated with M. robertsii hosted fewest aphids and showed increased activity of superoxide dismutase, implying a defense strategy of resistance towards herbivores. In M. brunneum-inoculated plants, hosting most R. padi, activities of catalase and glutathione reductase were increased suggesting enhanced detoxification responses towards aphids. However, M. brunneum simultaneously increased plant growth indicating that this isolate may cause the plant to tolerate herbivory. EPF seed inoculants may therefore mediate either tolerance or resistance towards biotic stress in plants in an isolate-dependent manner.
OriginalsprogEngelsk
Artikelnummer154298
TidsskriftJournal of Plant Physiology
Vol/bind300
Antal sider11
ISSN0176-1617
DOI
StatusUdgivet - 2024

Bibliografisk note

Funding Information:
This research was supported by the Punjab Educational Endowments Fund, Pakistan, under the Chief Minister Merit Scholarship programme and by the University of Copenhagen. TGR was supported by the Ministry of Education, Youth and Sports of Czech Republic within the National Sustainability Program I (NPU I), grant number LO1415.We are grateful to Prof Italo Delalibera Jr. from University of Sao Paolo, Brazil for sharing the Metarhizium robertsii isolate ESALQ1622. This research was supported by the Punjab Educational Endowments Fund, Pakistan, under the Chief Minister Merit Scholarship programme and by the University of Copenhagen. TGR was supported by the Ministry of Education, Youth and Sports of Czech Republic within the National Sustainability Program I (NPU I), grant number LO1415.

Funding Information:
We are grateful to Prof Italo Delalibera Jr. from University of Sao Paolo, Brazil for sharing the Metarhizium robertsii isolate ESALQ1622. This research was supported by the Punjab Educational Endowments Fund, Pakistan, under the Chief Minister Merit Scholarship programme and by the University of Copenhagen. TGR was supported by the Ministry of Education, Youth and Sports of Czech Republic within the National Sustainability Program I (NPU I), grant number LO1415.

Publisher Copyright:
© 2024 The Author(s)

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