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'STAMENOID PETALS' IN A NATURAL HOMEOTIC VARIANT OF

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Chapter 1 Repeated evolution of a floral trait in Capsella<br />

by Theißen (2000). With regard to the remarkable molecular and morphological<br />

differentiation, the decandric variant might (again) be treated as an independent taxon,<br />

resurrecting Capsella apetala from its early reports. Since no ecological adaptation to a<br />

certain (yet unknown) niche or any selective benefit was identified for the decandric<br />

variant, we hypothesize that the persistence of C. apetala is most likely the result of<br />

genetic hitch-hiking.<br />

References<br />

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Almquist E (1923) Studien über die Capsella bursa-pastoris (L.). II Acta Horti Bergiani, 7: 41-95.<br />

Al-Shehbaz IA, Beilstein MA, Kellogg EA (2006) Systematics and phylogeny of the Brassicaceae<br />

(Cruciferae): an overview. Plant Systematics and Evolution, 259: 89–120.<br />

Anderson IA, Busch JW (2006) Relaxed pollinator-mediated selection weakens floral integration in<br />

self-compatible taxa of Leavenworthia (Brassicaceae). American Journal of Botany, 93: 860-867.<br />

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Possible convergence in chemical composition. Botanical Journal of the Linnean Society, 140:<br />

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Barrett SCH (2002) The evolution of plant sexual diversity. Nature Reviews Genetics, 3: 274-284.<br />

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Pflanzen. Münster: Aschendorffschen Buchhandlung. Nachdruck Beverungen 1993,<br />

Naturkundlicher Verein Egge-Weser e.V.<br />

Bleeker W (2007) Interspecific hybridization in Rorippa (Brassicaceae): patterns and process.<br />

Systematics and Biodiversity, 5: 311-319.<br />

Bleeker W, Hurka H (2001) Introgressive hybridization in Rorippa (Brassicaceae): gene flow and its<br />

consequences in natural and anthropogenic habitats. Molecular Ecology, 10: 2013–2022.<br />

Bowman JL (2006) Molecules and morphology: comparative developmental genetics of the<br />

Brassicaceae. Plant Systematics and Evolution, 259: 199-215.<br />

Bowmann JL, Brüggemann H, Lee J-Y, Mummenhoff K (1999) Evolutionary changes in floral structure<br />

within the genus Lepidium L. (Brassicaceae). International Journal of Plant Sciences 160: 917-<br />

929.<br />

Bosbach K, Hurka H (1981) Biosystematic studies on Capsella bursa-pastoris (Brassicaceae): enzyme<br />

polymorphisms in natural populations. Plant Systematics and Evolution, 137: 73-94.<br />

Coen ES, Meyerowitz EM (1991) The war of the whorls: genetic interactions controlling flower<br />

development. Nature, 353: 31-37.<br />

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