J 2017

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

LEKBERG, Ylva, Viktoria WAGNER, Alexii RUMMEL, Morgan MCLEOD, Philip W. RAMSEY et. al.

Basic information

Original name

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

Authors

LEKBERG, Ylva (840 United States of America), Viktoria WAGNER (276 Germany, guarantor, belonging to the institution), Alexii RUMMEL (840 United States of America), Morgan MCLEOD (840 United States of America) and Philip W. RAMSEY (840 United States of America)

Edition

ECOLOGICAL APPLICATIONS, Hoboken, Wiley, 2017, 1051-0761

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10618 Ecology

Country of publisher

United States of America

Confidentiality degree

není předmětem státního či obchodního tajemství

Impact factor

Impact factor: 4.393

RIV identification code

RIV/00216224:14310/17:00100411

Organization unit

Faculty of Science

DOI

UT WoS

000416862700009

Keywords in English

16:1 omega 5 lipid analysis; arbuscular mycorrhizal fungi; Centaurea stoebe; herbicide application; invasion meltdown; picloram; plant composition; Poa bulbosa; range restoration; Tordon

Tags

Změněno: 11/4/2018 23:52, Ing. Nicole Zrilić

Abstract

V originále

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.