Limits...
Positive feedback between mycorrhizal fungi and plants influences plant invasion success and resistance to invasion.

Zhang Q, Yang R, Tang J, Yang H, Hu S, Chen X - PLoS ONE (2010)

Bottom Line: We found that S. canadensis altered AMF spore composition by increasing one AMF species (Glomus geosporum) while reducing Glomus mosseae, which is the dominant species in the field.Our results demonstrate that the invasive S. canadensis alters soil AMF community composition because of fungal-host preference.This change in the composition of the AMF community generates positive feedback to the invasive S. canadensis itself and decreases AM associations with native K. striata, thereby making the native K. striata less dominant.

View Article: PubMed Central - PubMed

Affiliation: College of Life Sciences, Zhejiang University, Hangzhou, China.

ABSTRACT
Negative or positive feedback between arbuscular mycorrhizal fungi (AMF) and host plants can contribute to plant species interactions, but how this feedback affects plant invasion or resistance to invasion is not well known. Here we tested how alterations in AMF community induced by an invasive plant species generate feedback to the invasive plant itself and affect subsequent interactions between the invasive species and its native neighbors. We first examined the effects of the invasive forb Solidago canadensis L. on AMF communities comprising five different AMF species. We then examined the effects of the altered AMF community on mutualisms formed with the native legume forb species Kummerowia striata (Thunb.) Schindl. and on the interaction between the invasive and native plants. The host preferences of the five AMF were also assessed to test whether the AMF form preferred mutualistic relations with the invasive and/or the native species. We found that S. canadensis altered AMF spore composition by increasing one AMF species (Glomus geosporum) while reducing Glomus mosseae, which is the dominant species in the field. The host preference test showed that S. canadensis had promoted the abundance of AMF species (G. geosporum) that most promoted its own growth. As a consequence, the altered AMF community enhanced the competitiveness of invasive S. canadensis at the expense of K. striata. Our results demonstrate that the invasive S. canadensis alters soil AMF community composition because of fungal-host preference. This change in the composition of the AMF community generates positive feedback to the invasive S. canadensis itself and decreases AM associations with native K. striata, thereby making the native K. striata less dominant.

Show MeSH
Biomass ratio of K. striata to S. canadensis (A) and aggressivity index of competition between K. striata and S. canadensis (B) in response to various AMF communities in experiment 2.The ratio of biomasses and aggressivity index were calculated based on shoot biomass. I-N-AMF: the initial non-AMF control; SC-N-AMF: the S. canadensis-altered non-AMF control; KS-N-AF: the K. striata-altered non-AMF soil control; I-AMF: the initial AMF community; SC-A-AMF: the AMF community altered by the invasive S. canadensis; KS-A-AMF: the AMF community altered by the native K. striata. Values are means ± standard error. Means with different letters are significantly different at the 5% level. Inset pie charts represent biomass composition of the two plant species.
© Copyright Policy
Related In: Results  -  Collection


getmorefigures.php?uid=PMC2927435&req=5

pone-0012380-g004: Biomass ratio of K. striata to S. canadensis (A) and aggressivity index of competition between K. striata and S. canadensis (B) in response to various AMF communities in experiment 2.The ratio of biomasses and aggressivity index were calculated based on shoot biomass. I-N-AMF: the initial non-AMF control; SC-N-AMF: the S. canadensis-altered non-AMF control; KS-N-AF: the K. striata-altered non-AMF soil control; I-AMF: the initial AMF community; SC-A-AMF: the AMF community altered by the invasive S. canadensis; KS-A-AMF: the AMF community altered by the native K. striata. Values are means ± standard error. Means with different letters are significantly different at the 5% level. Inset pie charts represent biomass composition of the two plant species.

Mentions: AMF communities significantly affected the ratio of K. striata to S. canadensis biomass in mixture (F5,18 = 7.97, P = 0.000). There was no significant difference in biomass ratio among the three non-AMF controls (Fig. 4A, P<0.05). The biomass ratio of K. striata to S. canadensis was reduced by SC-A-AMF treatment (P<0.05), but was enhanced by the KS-A-AMF treatment (P<0.05) (Fig. 4A).


Positive feedback between mycorrhizal fungi and plants influences plant invasion success and resistance to invasion.

Zhang Q, Yang R, Tang J, Yang H, Hu S, Chen X - PLoS ONE (2010)

Biomass ratio of K. striata to S. canadensis (A) and aggressivity index of competition between K. striata and S. canadensis (B) in response to various AMF communities in experiment 2.The ratio of biomasses and aggressivity index were calculated based on shoot biomass. I-N-AMF: the initial non-AMF control; SC-N-AMF: the S. canadensis-altered non-AMF control; KS-N-AF: the K. striata-altered non-AMF soil control; I-AMF: the initial AMF community; SC-A-AMF: the AMF community altered by the invasive S. canadensis; KS-A-AMF: the AMF community altered by the native K. striata. Values are means ± standard error. Means with different letters are significantly different at the 5% level. Inset pie charts represent biomass composition of the two plant species.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC2927435&req=5

pone-0012380-g004: Biomass ratio of K. striata to S. canadensis (A) and aggressivity index of competition between K. striata and S. canadensis (B) in response to various AMF communities in experiment 2.The ratio of biomasses and aggressivity index were calculated based on shoot biomass. I-N-AMF: the initial non-AMF control; SC-N-AMF: the S. canadensis-altered non-AMF control; KS-N-AF: the K. striata-altered non-AMF soil control; I-AMF: the initial AMF community; SC-A-AMF: the AMF community altered by the invasive S. canadensis; KS-A-AMF: the AMF community altered by the native K. striata. Values are means ± standard error. Means with different letters are significantly different at the 5% level. Inset pie charts represent biomass composition of the two plant species.
Mentions: AMF communities significantly affected the ratio of K. striata to S. canadensis biomass in mixture (F5,18 = 7.97, P = 0.000). There was no significant difference in biomass ratio among the three non-AMF controls (Fig. 4A, P<0.05). The biomass ratio of K. striata to S. canadensis was reduced by SC-A-AMF treatment (P<0.05), but was enhanced by the KS-A-AMF treatment (P<0.05) (Fig. 4A).

Bottom Line: We found that S. canadensis altered AMF spore composition by increasing one AMF species (Glomus geosporum) while reducing Glomus mosseae, which is the dominant species in the field.Our results demonstrate that the invasive S. canadensis alters soil AMF community composition because of fungal-host preference.This change in the composition of the AMF community generates positive feedback to the invasive S. canadensis itself and decreases AM associations with native K. striata, thereby making the native K. striata less dominant.

View Article: PubMed Central - PubMed

Affiliation: College of Life Sciences, Zhejiang University, Hangzhou, China.

ABSTRACT
Negative or positive feedback between arbuscular mycorrhizal fungi (AMF) and host plants can contribute to plant species interactions, but how this feedback affects plant invasion or resistance to invasion is not well known. Here we tested how alterations in AMF community induced by an invasive plant species generate feedback to the invasive plant itself and affect subsequent interactions between the invasive species and its native neighbors. We first examined the effects of the invasive forb Solidago canadensis L. on AMF communities comprising five different AMF species. We then examined the effects of the altered AMF community on mutualisms formed with the native legume forb species Kummerowia striata (Thunb.) Schindl. and on the interaction between the invasive and native plants. The host preferences of the five AMF were also assessed to test whether the AMF form preferred mutualistic relations with the invasive and/or the native species. We found that S. canadensis altered AMF spore composition by increasing one AMF species (Glomus geosporum) while reducing Glomus mosseae, which is the dominant species in the field. The host preference test showed that S. canadensis had promoted the abundance of AMF species (G. geosporum) that most promoted its own growth. As a consequence, the altered AMF community enhanced the competitiveness of invasive S. canadensis at the expense of K. striata. Our results demonstrate that the invasive S. canadensis alters soil AMF community composition because of fungal-host preference. This change in the composition of the AMF community generates positive feedback to the invasive S. canadensis itself and decreases AM associations with native K. striata, thereby making the native K. striata less dominant.

Show MeSH