Early evolution of angiosperm pollen as inferred from molecular and morphological phylogenetic analyses

Autor:	James A Doyle
Rok vydání:	2005
Předmět:	Illiciales biology Phylogenetic tree Laurales Plant Science biology.organism_classification medicine.disease_cause Magnoliales Nymphaeales Pollen Austrobaileya Botany medicine Trimenia Ecology Evolution Behavior and Systematics
Zdroj:	Grana. 44:227-251
ISSN:	1651-2049 0017-3134
DOI:	10.1080/00173130500424557
Popis:	Phylogenetic analyses of molecular and morphological data, revised in this study, shed light on long‐standing controversies on the early evolution of angiosperm pollen. Although relationships between angiosperms and other seed plants remain uncertain, the robust rooting of the angiosperms among the “ANITA” groups (Amborella, Nymphaeales, Illiciales, Trimenia, and Austrobaileya) clarifies their original pollen morphology. Contrary to the view that the first angiosperms had boat‐shaped monosulcate pollen with granular or atectate exine structure, the ANITA rooting implies that globose monosulcate pollen with more or less columellar structure and a continuous tectum was ancestral and a foveolate‐reticulate tectum arose soon after. The oldest recognized Cretaceous angiosperm pollen may represent the latter grade of evolution. Structure described as granular evolved independently from columellar within Nymphaeales, Magnoliales, and Laurales. In Magnoliales, columellar Myristicaceae and Magnoliaceae diverge bel...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::d7ba59794da86a2f8727ef936343bbc7 https://doi.org/10.1080/00173130500424557 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
Nepřihlášeným uživatelům se plný text nezobrazuje	K zobrazení výsledku je třeba se přihlásit.