Strong indirect herbicide effects on mycorrhizal associations through plant community shifts and secondary invasions

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F17%3A00100411" target="_blank" >RIV/00216224:14310/17:00100411 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1002/eap.1613" target="_blank" >http://dx.doi.org/10.1002/eap.1613</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/eap.1613" target="_blank" >10.1002/eap.1613</a>

Result language

angličtina

Original language name

Strong indirect herbicide effects on mycorrhizal associations through plant community shifts and secondary invasions

Original language description

Million of acres of U.S. wildlands are sprayed with herbicides to control invasive species, but relatively little is known about non-target effects of herbicide use. We combined greenhouse, field, and laboratory experiments involving the invasive forb spotted knapweed (Centaurea stoebe) and native bunchgrasses to assess direct and indirect effects of the forb-specific herbicide picloram on arbuscular mycorrhizal fungi (AMF), which are beneficial soil fungi that colonize most plants. Picloram had no effect on bunchgrass viability and their associated AMF in the greenhouse, but killed spotted knapweed and reduced AMF colonization of a subsequent host grown. Results were similar in the field where AMF abundance in bunchgrass-dominated plots was unaffected by herbicides one year after spraying based on 16:omega 15 phospholipid fatty acid (PLFA) and neutral lipid fatty acid (NLFA) concentrations. In spotted-knapweed-dominated plots, however, picloram application shifted dominance from spotted knapweed, a good AMF host, to bulbous bluegrass (Poa bulbosa), a poor AMF host. This coincided with a 63% reduction in soil 16:omega 15 NLFA concentrations but no reduction of 16:omega 15 PLFA. Because 16:omega 15 NLFA quantifies AMF storage lipids and 16:omega 15 PLFA occurs in AMF membrane lipids, we speculate that the herbicide-mediated reduction in host quality reduced fungal carbon storage, but not necessarily fungal abundance after one year in the field. Overall, in greenhouse and field experiments, AMF were only affected when picloram altered host quantity and quality. This apparent lack of direct effect was supported by our in-vitro trial where picloram applied to AMF mycelia did not reduce fungal biomass and viability. We show that the herbicide picloram can have profound, indirect effects on AMF within one year. Depending on herbicide-mediated shifts in host quality, rapid interventions may be necessary post herbicide applications to prevent loss of AMF abundance. Future research should assess consequences of these potential shifts for the restoration of native plants that differ in mycorrhizal dependency.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10618 - Ecology

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

ECOLOGICAL APPLICATIONS

ISSN

1051-0761

e-ISSN

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Volume of the periodical

27

Issue of the periodical within the volume

8

Country of publishing house

US - UNITED STATES

Number of pages

10

Pages from-to

2359-2368

UT code for WoS article

000416862700009

EID of the result in the Scopus database

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