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Flowers on the Tree of Life.
Explores ongoing flower morphological and ontogenetic research and its impact on our understanding of floral evolution and relationships.
| Clasificación: | Libro Electrónico |
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| Autor principal: | |
| Otros Autores: | |
| Formato: | Electrónico eBook |
| Idioma: | Inglés |
| Publicado: |
Cambridge :
Cambridge University Press,
2011.
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| Colección: | Systematics Association special volume.
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| Temas: | |
| Acceso en línea: | Texto completo |
Tabla de Contenidos:
- Cover; Title; Copyright; Contents; Acknowledgements; 1 Introduction: Establishing the state of the art
- the role of morphology in plant systematics; 1.1 Outlook; 1.2 Contents; 1.3 References; 2 Spatial separation and developmental divergence of male and female reproductive units in gymnosperms, and their relevance to the origin of the angiosperm flower; 2.1 Introduction: aims and terminology; 2.2 The enlarged phylogenetic gap between extant angiosperms and extant gymnosperms; 2.3 Evolutionary-developmental genetic models of the origin of the (hermaphrodite) flower.
- 2.3.1 B- and C-class MADS-box genes2.3.2 The LEAFY gene family; 2.3.3 'Mostly Male' theory; 2.3.4 'Pleiotropy Constraint' model; 2.3.5 'Out of Male' and 'Out of Female' co-hypotheses; 2.3.6 'Further Out of Male' hypothesis; 2.3.7 Selecting among the competing hypotheses; 2.4 Spanners in the works: erroneous assumptions and a predominance of clinal expression patterns; 2.4.1 Location of expression; 2.4.2 Teratological phenotypes; 2.5 Gender separation is implicated in the origin and early diversification of the (gymnospermous) seed-plants.
- 2.5.1 Did male-female segregation permit the origin of the seed?2.5.2 Architectural ambiguities obscure sexual systems in fossils; 2.5.3 Divergence of developmental programming in male and female organs; 2.6 Are hermaphrodite bennettites a phylogenetic red herring?; 2.7 Knowledge of gender control in extant gymnosperms and angiosperms remains inadequate; 2.8 Conclusions; Acknowledgements; 2.9 References; 2.10 Note added in proof; 3 New flowers of Laurales from the Early Cretaceous (Early to Middle Albian) of eastern North America; 3.1 Introduction; 3.2 Materials and methods.
- 3.2.1 Collection and preparation of the fossil material3.2.2 Phylogenetic analyses and interpretations; 3.3 Description of fossil flowers; 3.3.1 Bisexual flower bud (PP53716); Systematics; Description; 3.3.2 Flower fragments (PP43735, PP43751, PP53734); Systematics; Description; 3.4 Discussion; 3.4.1 General systematic relationships of the fossils; 3.4.2 Interpretation of the fossil Cohongarootonia hispida and its systematic affinity; 3.4.3 Interpretation of the fossil Powhatania connata and its systematic affinity.
- 3.4.4 Comparison with other lauralean reproductive structures from the Cretaceous3.5 Conclusions; Acknowledgements; 3.6 References; 4 Tracing the early evolutionary diversification of the angiosperm flower; 4.1 Introduction; 4.2 From the base of the angiosperms to mesangiosperms; 4.2.1 Magnoliidae; 4.2.2 Monocots; 4.2.3 Eudicots; 4.3 Conclusions; Acknowledgements; 4.4 References; 5 Changing views of flower evolution and new questions; 5.1 Flowers in phylogenetic and evolutionary studies; 5.2 Homology; 5.3 Alpha- and omega-morphology.