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作者 Goss, Erica Megan
書名 Ecology and evolution of the interaction between the plant host Arabidopsis thaliana and its natural bacterial pathogen Pseudomonas viridiflava
國際標準書號 9780542214028
book jacket
說明 115 p
附註 Source: Dissertation Abstracts International, Volume: 66-06, Section: B, page: 2921
Adviser: Joy Bergelson
Thesis (Ph.D.)--The University of Chicago, 2005
Pathogens and their plant hosts can have reciprocal effects on both the numerical abundance and gene frequencies of the other species. Ecological and genetic factors are increasingly being integrated in mathematical models of host-pathogen interactions, yet comprehensive studies of wild systems remain limited in number and breadth. The ecological and evolutionary dynamics of plant-pathogen interactions should be highly dependent on the life history of the pathogen, but little is known about bacterial pathogens in association with wild plant communities
I examined the evolutionary ecology of the interaction between the annual weed Arabidopsis thaliana and its natural bacterial pathogen P. viridiflava in Midwest populations. P. viridiflava was found to contain two genetically distinct and diverse groups (clades), which were found in close proximity in multiple populations. Within clades, there was evidence of frequent recombination and little geographic differentiation, which distinguishes P. viridiflava from other plant pathogens that have been examined. P. viridiflava infection rates in A. thaliana populations ranged from zero to greater than 50% and were correlated with A. thaliana population density. Yet, P. viridiflava appears to be a generalist pathogen, as it was found infecting other plants species that commonly co-occurred with A. thaliana . I found variation in resistance and virulence within and among plant and pathogen populations, as well as variation in virulence between the P. viridiflava clades, as measured by bacterial population size in the leaf and symptom severity 4 days after infection. Both resistance and plant development rate varied with field type of origin (cultivated or fallow), suggesting that different selection regimes in these two environments may mediate the interaction between A. thaliana and P. viridiflava. While I did not find a pattern of pathogen local adaptation, the two clades of P. viridiflava exhibited a possible tradeoff in virulence on A. thaliana from fallow versus cultivated fields. Finally, infection by P. viridiflava reduced the fitness of A. thaliana as measured by lifetime seed production in field and growth chamber experiments, with tolerance to infection varying among A. thaliana lines and with P. viridiflava clade, but also with environment
School code: 0330
DDC
Host Item Dissertation Abstracts International 66-06B
主題 Biology, Ecology
Biology, Plant Physiology
0329
0817
Alt Author The University of Chicago
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