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Impact of an Emerging Bipolaris Path...

Lane, Brett R.

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Impact of an Emerging Bipolaris Pathogen on the Microbial Community of Invasive Microstegium vimineum.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Impact of an Emerging Bipolaris Pathogen on the Microbial Community of Invasive Microstegium vimineum./
Author:	Lane, Brett R.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
Description:	136 p.
Notes:	Source: Dissertations Abstracts International, Volume: 84-07, Section: B.
Contained By:	Dissertations Abstracts International84-07B.
Subject:	Plant pathology. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28772813
ISBN:	9798368438573

Impact of an Emerging Bipolaris Pathogen on the Microbial Community of Invasive Microstegium vimineum.
Lane, Brett R.

Impact of an Emerging Bipolaris Pathogen on the Microbial Community of Invasive Microstegium vimineum. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 136 p.

Source: Dissertations Abstracts International, Volume: 84-07, Section: B.

Thesis (Ph.D.)--University of Florida, 2021.

When an invasive species establishes in a novel range, it can leave behind much of the microbial community from its native range. With time, an invader accumulates both beneficial and harmful microbes in its novel range. Accumulated beneficial microbes may aid invasions through the production of plant hormones, anti-microbial compounds, and the competitive exclusion of potential pathogens. Pathogens may hamper the invader or may spill-over onto native species and aid the invader. Microstegium vimineum is an invasive C4 annual grass which has invaded much of the eastern United States. It is most commonly observed in riparian areas, roadsides, and other disturbed areas where it forms dense near-monotypic stands, impacts ecological functions, and forms dense mats of M. vimineum litter which promotes the spread of M. vimineum through the suppression of native seedings and dispersal of cleistogamous seeds.Recently, several Bipolaris pathogens have been identified on this prolific invader. Here, we investigated the impact of these pathogens on the microbial community of the invasive annual grass M. vimineum. First, we identified the pathogen Bipolaris taxon megaspora as Drechslera gigantea and proposed its transfer to the genus Bipolaris as Bipolaris gigantea. Second, we investigated how the suppression of Bipolaris pathogens by repeated fungicide applications altered the fungal community of M. vimineum. We found that iprodione application caused significant taxonomic shifts while resulting in little to no change in diversity metrics. Niches vacated by fungicide application were quickly filled by other taxa. These results demonstrate M. vimineum has accumulated a diverse, functionally redundant, microbial assemblage. Finally, as M. vimineum litter plays a significant role in the invasion process, we investigated the impact of accumulated Bipolaris pathogens on the decomposition of M. vimineum litter. Our results revealed that Bipolaris infection delays the decomposition of litter in the spring, potentially promoting the survival of Bipolaris inoculum.In whole, these results demonstrate that M. vimineum has accumulated a diverse array of fungal endophytes in its invaded range. Further, Bipolaris infection delays the decomposition litter material, potentially amplifying the impact of this accumulated pathogen on M. vimineum and native grass hosts.

ISBN: 9798368438573Subjects--Topical Terms:

3174872
Plant pathology.
Subjects--Index Terms:

Bipolaris gigantea

Impact of an Emerging Bipolaris Pathogen on the Microbial Community of Invasive Microstegium vimineum.
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520 $a When an invasive species establishes in a novel range, it can leave behind much of the microbial community from its native range. With time, an invader accumulates both beneficial and harmful microbes in its novel range. Accumulated beneficial microbes may aid invasions through the production of plant hormones, anti-microbial compounds, and the competitive exclusion of potential pathogens. Pathogens may hamper the invader or may spill-over onto native species and aid the invader. Microstegium vimineum is an invasive C4 annual grass which has invaded much of the eastern United States. It is most commonly observed in riparian areas, roadsides, and other disturbed areas where it forms dense near-monotypic stands, impacts ecological functions, and forms dense mats of M. vimineum litter which promotes the spread of M. vimineum through the suppression of native seedings and dispersal of cleistogamous seeds.Recently, several Bipolaris pathogens have been identified on this prolific invader. Here, we investigated the impact of these pathogens on the microbial community of the invasive annual grass M. vimineum. First, we identified the pathogen Bipolaris taxon megaspora as Drechslera gigantea and proposed its transfer to the genus Bipolaris as Bipolaris gigantea. Second, we investigated how the suppression of Bipolaris pathogens by repeated fungicide applications altered the fungal community of M. vimineum. We found that iprodione application caused significant taxonomic shifts while resulting in little to no change in diversity metrics. Niches vacated by fungicide application were quickly filled by other taxa. These results demonstrate M. vimineum has accumulated a diverse, functionally redundant, microbial assemblage. Finally, as M. vimineum litter plays a significant role in the invasion process, we investigated the impact of accumulated Bipolaris pathogens on the decomposition of M. vimineum litter. Our results revealed that Bipolaris infection delays the decomposition of litter in the spring, potentially promoting the survival of Bipolaris inoculum.In whole, these results demonstrate that M. vimineum has accumulated a diverse array of fungal endophytes in its invaded range. Further, Bipolaris infection delays the decomposition litter material, potentially amplifying the impact of this accumulated pathogen on M. vimineum and native grass hosts.
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