Community Ecology

, Volume 14, Issue 1, pp 67–76 | Cite as

Arbuscular mycorrhizal colonisation of roots of grass species differing in invasiveness

  • G. EndreszEmail author
  • I. Somodi
  • T. Kalapos


Recent research indicates that the soil microbial community, particularly arbuscular mycorrhizal fungi (AMF), can influence plant invasion in several ways. We tested if 1) invasive species are colonised by AMF to a lower degree than resident native species, and 2) AMF colonisation of native plants is lower in a community inhabited by an invasive species than in an uninvaded resident community. The two tests were run in semiarid temperate grasslands on grass (Poaceae) species, and the frequency and intensity of mycorrhizal colonisation, and the proportion of arbuscules and vesicles in plant roots have been measured. In the first test, grasses representing three classes of invasiveness were included: invasive species, resident species becoming abundant upon disturbance, and non-invasive native species. Each class contained one C3 and one C4 species. The AMF colonisation of the invasive Calamagrostis epigejos and Cynodon dactylon was consistently lower than that of the non-invasive native Chrysopogon gryllus and Bromus inermis, and contained fewer arbuscules than the post-disturbance dominant resident grasses Bothriochloa ischaemum andBrachypodiumpinnatum. The C3 and C4 grasses behaved alike despite their displaced phenologies in these habitats. The second test compared AMF colonisation for sand grassland dominant grasses Festuca vaginata and Stipa borysthenica in stands invaded by either C. epigejos or C. dactylon, and in the uninvaded natural community. Resident grasses showed lower degree of AMF colonisation in the invaded stand compared to the uninvaded natural community with F. vaginata responding so to both invaders, while S. borysthenica responding to C. dactylon only. These results indicate that invasive grasses supposedly less reliant on AMF symbionts have the capacity of altering the soil mycorrhizal community in such a way that resident native species can establish a considerably reduced extent of the beneficial AMF associations, hence their growth, reproduction and ultimately abundance may decline. Accumulating evidence suggests that such indirect influences of invasive alien plants on resident native species mediated by AMF or other members of the soil biota is probably more the rule than the exception.


Arbuscular mycorrhizal fungi Calamagrostis epigejos Cynodon dactylon Grasses Invasive plants Semiarid temperate grassland 



Arbuscular Mycorrhizal Fungi


percentage arbuscule occurrence of the AMF colonised root section


percentage arbuscule occurrence of the whole root


frequency of root segments colonised by AMF


intensity of mycorrhizal colonisation


percentage vesicle occurrence of the AMF colonised root section


percentage vesicle occurrence of the whole root


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Authors and Affiliations

  1. 1.Department of Plant Systematics, Ecology and Theoretical BiologyInstitute of Biology, Eötvös Loránd UniversityBudapestHungary
  2. 2.MTA Centre for Ecological ResearchInstitute of Ecology and BotanyVácrátótHungary

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