National Repository of Grey Literature 3 records found  Search took 0.00 seconds. 
Homoploid hybrid speciation in closely related taxa of wetland plants
Píšová, Soňa
6 Summary Wetland plants share several common characters, such as clonality, wind pollination and self-compatibility that facilitate hybridization, especially in complexes of closely related taxa. In this thesis, a Sparganium erectum complex of four subspecies and 14 species of the genus Bolboschoenus were investigated to detect hybridization and verify the origins of putative hybrids. The first part of the thesis is dedicated to an introduction to hybridization, a process of great evolutionary impact, and its several general consequences, which are broadly discussed with numerous examples. In addition, an introduction to the studied taxa is provided as well as the main results of three papers that are presented and discussed herein. The second part of the thesis consists of three papers on hybridization within the Sparganium erectum aggregate (Paper I) and in the genus Bolboschoenus (Paper II, central European species; Paper III all 14 species worldwide). AFLP molecular marker analysis, sequencing of nuclear and chloroplast DNA, and genome size and morphometric analyses were applied to elucidate the genetic relationships among taxa and to confirm the suitability of morphometric characters for taxa and hybrid delimitation. The results clearly present the differentiation of individual taxa and their stable...
Homoploid hybrid speciation in closely related taxa of wetland plants
Píšová, Soňa ; Fér, Tomáš (advisor) ; Albach, Dirk Carl (referee) ; Koutecký, Petr (referee)
6 Summary Wetland plants share several common characters, such as clonality, wind pollination and self-compatibility that facilitate hybridization, especially in complexes of closely related taxa. In this thesis, a Sparganium erectum complex of four subspecies and 14 species of the genus Bolboschoenus were investigated to detect hybridization and verify the origins of putative hybrids. The first part of the thesis is dedicated to an introduction to hybridization, a process of great evolutionary impact, and its several general consequences, which are broadly discussed with numerous examples. In addition, an introduction to the studied taxa is provided as well as the main results of three papers that are presented and discussed herein. The second part of the thesis consists of three papers on hybridization within the Sparganium erectum aggregate (Paper I) and in the genus Bolboschoenus (Paper II, central European species; Paper III all 14 species worldwide). AFLP molecular marker analysis, sequencing of nuclear and chloroplast DNA, and genome size and morphometric analyses were applied to elucidate the genetic relationships among taxa and to confirm the suitability of morphometric characters for taxa and hybrid delimitation. The results clearly present the differentiation of individual taxa and their stable...
Evaluation of variability within Sparganium erectum using morphometrics, AFLP and flow cytometry
Píšová, Soňa ; Kaplan, Zdeněk (referee) ; Fér, Tomáš (advisor)
MSc. thesis is based on evaluation of intraspecific morphological and genetic variation of Sparganium erectum L. in the Czech Republic. Four intraspecific taxa were examined: S. erectum subsp. erectum L., S. erectum subsp. oocarpum (ČELAK.) DOMIN, S. erectum subsp. neglectum (BEEDY) RICHTER and S. erectum subsp. microcarpum (L.M. NEUMANN) DOMIN. Various approaches such as multivariate morphometric analysis (PCA, discriminant analyses), estimation of genome size by propidium iodide flow cytometry and molecular analysis of total genomic DNA (AFLP) were applied for study close related subspecies. Multivariate analysis of morphological characters of fruits (for 350 individuals from 63 native populations) presented some distribution to four closed groups. Partial overlapping was observed for S.erectum subsp. neglectum with subsp. microcarpum and subsp. oocarpum. Similar situation (overlapping subsp. neglectum a microcarpum) was observed within genome size. Remaining two taxa, S. erectum subsp. erectum and subsp. oocarpum, were well-differentiated using genome size data. Most important morphological characters on fruits useful for subspecies determination were: sterility of fruit heads, presence or absence of peduncle, distinct shoulder between upper and lower part, constriction below the shoulder, width of fruit...

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2 Píšová, Simona
1 Píšová, Šárka
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