Publikation: Pollen cone teratologies in Sequoia sempervirens (D. Don) Endl. and Widdringtonia nodiflora (L.) Powrie (Cupressaceae) in the light of conifer evolution
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Different types of pollen cone teratologies in Sequoia sempervirens and Widdringtonia nodiflora were investigated. While wild type pollen cones are uniaxial and hyposporangiate, some teratological polyaxial pollen cones and also perisporangiate microsporangiophores were found. The teratological compound pollen cones in Sequoia seem to represent just random artifacts caused by a spitting of the pollen cone apex, maybe due to a pathogenic event in early developmental stages. In Widdringtonia it remains open, if the compound male reproductive units represent a dense distal cluster of pollen cones or a compound, polyaxial inflorescence comparable to other conifers, e.g. Cephalotaxus (Taxaceae). The perisporangiate microsporangiophores found in some of the teratological pollen cones in Widdringtonia are remarkable, because among extant conifers this type of microsporangiophores is developed only in Taxaceae. Previous studies showed that the perisporangiate type of microsporangiophores represents a radial synangium consisting of several fused hyposporangiate microsporangiophores. However, the perisporangiate microsporangiophores in Taxaceae and Widdringtonia show some distinct structural differences excluding the perisporangiate microsporangiophores in Widdringtonia as representing a radial synangium.
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DÖRKEN, Veit, Thomas STÜTZEL, 2019. Pollen cone teratologies in Sequoia sempervirens (D. Don) Endl. and Widdringtonia nodiflora (L.) Powrie (Cupressaceae) in the light of conifer evolution. In: Feddes Repertorium. 2019, 130(4), pp. 337-345. ISSN 0014-8962. eISSN 1522-239X. Available under: doi: 10.1002/fedr.201800031BibTex
@article{Dorken2019-12Polle-47024, year={2019}, doi={10.1002/fedr.201800031}, title={Pollen cone teratologies in Sequoia sempervirens (D. Don) Endl. and Widdringtonia nodiflora (L.) Powrie (Cupressaceae) in the light of conifer evolution}, number={4}, volume={130}, issn={0014-8962}, journal={Feddes Repertorium}, pages={337--345}, author={Dörken, Veit and Stützel, Thomas} }
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