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Your search keyword '"Agler, Matthew T."' showing total 15 results
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15 results on '"Agler, Matthew T."'

9. Root microbiota dynamics of perennial Arabis alpina are dependent on soil residence time but independent of flowering time

Author

Dombrowski, Nina, Schlaeppi, Klaus, Agler, Matthew T., Hacquard, Stephane, Kemen, Eric, Garrido-Oter, Ruben, Wunder, Joerg, Coupland, George, Schulze-Lefert, Paul, Dombrowski, Nina, Schlaeppi, Klaus, Agler, Matthew T., Hacquard, Stephane, Kemen, Eric, Garrido-Oter, Ruben, Wunder, Joerg, Coupland, George, and Schulze-Lefert, Paul

Abstract

Recent field and laboratory experiments with perennial Boechera stricta and annual Arabidopsis thaliana suggest that the root microbiota influences flowering time. Here we examined in long-term time-course experiments the bacterial root microbiota of the arctic-alpine perennial Arabis alpina in natural and controlled environments by 16S rRNA gene profiling. We identified soil type and residence time of plants in soil as major determinants explaining up to 15% of root microbiota variation, whereas environmental conditions and host genotype explain maximally 11% of variation. When grown in the same soil, the root microbiota composition of perennial A. alpina is largely similar to those of its annual relatives A. thaliana and Cardamine hirsuta. Non-flowering wild-type A. alpina and flowering pep1 mutant plants assemble an essentially indistinguishable root microbiota, thereby uncoupling flowering time from plant residence time-dependent microbiota changes. This reveals the robustness of the root microbiota against the onset and perpetual flowering of A. alpina. Together with previous studies, this implies a model in which parts of the root microbiota modulate flowering time, whereas, after microbiota acquisition during vegetative growth, the established root-associated bacterial assemblage is structurally robust to perturbations caused by flowering and drastic changes in plant stature.

Published
2017

14. Host-microbe and microbe-microbe interactions in the evolution of obligate plant parasitism.

Author

Kemen, Ariane C., Agler, Matthew T., and Kemen, Eric

Subjects
*HOST-parasite relationships, *MICROORGANISMS, *PLANT parasites, *BIOLOGICAL evolution, *GENOMES, *ASEXUAL reproduction, *SEXUAL cycle
Abstract

1207I.1208II.1209III.1211IV.1217V.1218VI.1219VII.1221VIII.12241224References1224 Summary: Research on obligate biotrophic plant parasites, which reproduce only on living hosts, has revealed a broad diversity of filamentous microbes that have independently acquired complex morphological structures, such as haustoria. Genome studies have also demonstrated a concerted loss of genes for metabolism and lytic enzymes, and gain of diversity of genes coding for effectors involved in host defense suppression. So far, these traits converge in all known obligate biotrophic parasites, but unexpected genome plasticity remains. This plasticity is manifested as transposable element (TE)‐driven increases in genome size, observed to be associated with the diversification of virulence genes under selection pressure. Genome expansion could result from the governing of the pathogen response to ecological selection pressures, such as host or nutrient availability, or to microbial interactions, such as competition, hyperparasitism and beneficial cooperations. Expansion is balanced by alternating sexual and asexual cycles, as well as selfing and outcrossing, which operate to control transposon activity in populations. In turn, the prevalence of these balancing mechanisms seems to be correlated with external biotic factors, suggesting a complex, interconnected evolutionary network in host–pathogen–microbe interactions. Therefore, the next phase of obligate biotrophic pathogen research will need to uncover how this network, including multitrophic interactions, shapes the evolution and diversity of pathogens. [ABSTRACT FROM AUTHOR]

Published
2015
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15. Root microbiota dynamics of perennial Arabis alpinaare dependent on soil residence time but independent of flowering time

Author

Dombrowski, Nina, Schlaeppi, Klaus, Agler, Matthew T, Hacquard, Stéphane, Kemen, Eric, Garrido-Oter, Ruben, Wunder, Jörg, Coupland, George, and Schulze-Lefert, Paul

Abstract

Recent field and laboratory experiments with perennial Boechera strictaand annual Arabidopsis thalianasuggest that the root microbiota influences flowering time. Here we examined in long-term time-course experiments the bacterial root microbiota of the arctic-alpine perennial Arabis alpinain natural and controlled environments by 16S rRNA gene profiling. We identified soil type and residence time of plants in soil as major determinants explaining up to 15% of root microbiota variation, whereas environmental conditions and host genotype explain maximally 11% of variation. When grown in the same soil, the root microbiota composition of perennial A. alpinais largely similar to those of its annual relatives A. thalianaand Cardamine hirsuta. Non-flowering wild-type A. alpinaand flowering pep1mutant plants assemble an essentially indistinguishable root microbiota, thereby uncoupling flowering time from plant residence time-dependent microbiota changes. This reveals the robustness of the root microbiota against the onset and perpetual flowering of A. alpina. Together with previous studies, this implies a model in which parts of the root microbiota modulate flowering time, whereas, after microbiota acquisition during vegetative growth, the established root-associated bacterial assemblage is structurally robust to perturbations caused by flowering and drastic changes in plant stature.

Published
2017
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