Breeding System Evolution and Pollination Success in the Wind-Pollinated Herb Plantago maritima
In this thesis, I examined variation in sex expression and mating patterns in the sexually polymorphic, wind-pollinated herb Plantago maritima. With a combination of field studies, greenhouse experiments, and genetic analyses, I (a) examined factors influencing sex ratio variation in gynodioecious p...
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Uppsala universitet, Institutionen för ekologi och evolution
2005
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ftuppsalauniv:oai:DiVA.org:uu-4790 2023-05-15T17:44:32+02:00 Breeding System Evolution and Pollination Success in the Wind-Pollinated Herb Plantago maritima Nilsson, Emil 2005 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4790 eng eng Uppsala universitet, Institutionen för ekologi och evolution Uppsala : Acta Universitatis Upsaliensis Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, 1651-6214 14 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4790 urn:isbn:91-554-6153-0 info:eu-repo/semantics/openAccess Biology Breeding system mating system gynodioecy male sterility reproductive output self-compatibility self-incompatibility wind-pollination founder event genetic structure Biologi Doctoral thesis, comprehensive summary info:eu-repo/semantics/doctoralThesis text 2005 ftuppsalauniv 2023-02-23T21:44:09Z In this thesis, I examined variation in sex expression and mating patterns in the sexually polymorphic, wind-pollinated herb Plantago maritima. With a combination of field studies, greenhouse experiments, and genetic analyses, I (a) examined factors influencing sex ratio variation in gynodioecious plants (in which hermaphrodites and females coexist), (b) discovered variation in breeding system, (c) investigated density-dependence of seed production, and (d) documented genetic variation within and among populations close to the northern range margin in Europe. In a survey of 104 P. maritima populations, I documented considerable variation in sex ratio (range 0-70% females, median 6.3% females). As predicted, females were more frequently missing from small than from large populations, and the variance in sex ratio increased with decreasing population size. Among twelve populations sampled for seed production, the frequency of females was positively related to relative fecundity of females and negatively related to population size. The results suggest that the local sex ratio is influenced both by the relative fecundity of females and hermaphrodites, and by stochastic processes in small populations. A comparative field study showed that plant fecundity decreased with increasing distance to nearest pollen donor both within and among populations in an archipelago in southern Sweden, where self-incompatibility was confirmed in controlled crosses. In contrast, plant fecundity was overall higher and was not density-dependent in the Skeppsvik archipelago in northern Sweden, where controlled crosses showed that plants are self-compatible. The results were consistent with the prediction that evolution of self-fertility should reduce density-dependence of pollination success. I quantified the genetic structure within and among populations from eastern Sweden and western Finland based on variation at four polymorphic microsatellite loci. The genetic diversity was low in northern Sweden, which may be the result of a history ... Doctoral or Postdoctoral Thesis Northern Sweden Uppsala University: Publications (DiVA) |
institution |
Open Polar |
collection |
Uppsala University: Publications (DiVA) |
op_collection_id |
ftuppsalauniv |
language |
English |
topic |
Biology Breeding system mating system gynodioecy male sterility reproductive output self-compatibility self-incompatibility wind-pollination founder event genetic structure Biologi |
spellingShingle |
Biology Breeding system mating system gynodioecy male sterility reproductive output self-compatibility self-incompatibility wind-pollination founder event genetic structure Biologi Nilsson, Emil Breeding System Evolution and Pollination Success in the Wind-Pollinated Herb Plantago maritima |
topic_facet |
Biology Breeding system mating system gynodioecy male sterility reproductive output self-compatibility self-incompatibility wind-pollination founder event genetic structure Biologi |
description |
In this thesis, I examined variation in sex expression and mating patterns in the sexually polymorphic, wind-pollinated herb Plantago maritima. With a combination of field studies, greenhouse experiments, and genetic analyses, I (a) examined factors influencing sex ratio variation in gynodioecious plants (in which hermaphrodites and females coexist), (b) discovered variation in breeding system, (c) investigated density-dependence of seed production, and (d) documented genetic variation within and among populations close to the northern range margin in Europe. In a survey of 104 P. maritima populations, I documented considerable variation in sex ratio (range 0-70% females, median 6.3% females). As predicted, females were more frequently missing from small than from large populations, and the variance in sex ratio increased with decreasing population size. Among twelve populations sampled for seed production, the frequency of females was positively related to relative fecundity of females and negatively related to population size. The results suggest that the local sex ratio is influenced both by the relative fecundity of females and hermaphrodites, and by stochastic processes in small populations. A comparative field study showed that plant fecundity decreased with increasing distance to nearest pollen donor both within and among populations in an archipelago in southern Sweden, where self-incompatibility was confirmed in controlled crosses. In contrast, plant fecundity was overall higher and was not density-dependent in the Skeppsvik archipelago in northern Sweden, where controlled crosses showed that plants are self-compatible. The results were consistent with the prediction that evolution of self-fertility should reduce density-dependence of pollination success. I quantified the genetic structure within and among populations from eastern Sweden and western Finland based on variation at four polymorphic microsatellite loci. The genetic diversity was low in northern Sweden, which may be the result of a history ... |
format |
Doctoral or Postdoctoral Thesis |
author |
Nilsson, Emil |
author_facet |
Nilsson, Emil |
author_sort |
Nilsson, Emil |
title |
Breeding System Evolution and Pollination Success in the Wind-Pollinated Herb Plantago maritima |
title_short |
Breeding System Evolution and Pollination Success in the Wind-Pollinated Herb Plantago maritima |
title_full |
Breeding System Evolution and Pollination Success in the Wind-Pollinated Herb Plantago maritima |
title_fullStr |
Breeding System Evolution and Pollination Success in the Wind-Pollinated Herb Plantago maritima |
title_full_unstemmed |
Breeding System Evolution and Pollination Success in the Wind-Pollinated Herb Plantago maritima |
title_sort |
breeding system evolution and pollination success in the wind-pollinated herb plantago maritima |
publisher |
Uppsala universitet, Institutionen för ekologi och evolution |
publishDate |
2005 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4790 |
genre |
Northern Sweden |
genre_facet |
Northern Sweden |
op_relation |
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, 1651-6214 14 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4790 urn:isbn:91-554-6153-0 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766146770346180608 |