Article: Pollen morphology of Croton of the New World and pollen evolution of tribe Crotoneae (Euphorbiaceae)
Review of palaeobotany and palynology. 2020 Oct., v. 281
2020
Abstract: Croton has ca. 1200 species and a pantropical distribution, representing the second largest genus in Euphorbiaceae. In this work, we aim to characterize morphologically the pollen grains of 105 species of Croton, besides other representatives of tribe ... ...
Abstract | Croton has ca. 1200 species and a pantropical distribution, representing the second largest genus in Euphorbiaceae. In this work, we aim to characterize morphologically the pollen grains of 105 species of Croton, besides other representatives of tribe Crotoneae, to provide palynological data sustaining its current delimitation and classification and understand how pollen grains evolved in the tribe. Floral buds were obtained from specimens and then acetolyzed, measured and described under light and scanning electronic microscopy. Pollen grains analyzed are medium to large, spherical, apolar, inaperturate and have the sexine thicker than the nexine. The Croton pattern is composed of pila or spine as ornamentation subunits, whose surface may be psilate, plicate or striate. Data on type, disposition, and distribution of sexine elements in the lumen of the rosettes are important to distinguish species. The spine Croton pattern has a single origin in Croton and is derived from the pilum type. Our study corroborates the stenopalynous status of Crotoneae since palynological features are highly conserved in the tribe. On the other hand, we point to the potential of the configuration of ornamentation units associated with the diameter of pollen grains to understand pollen evolution in the tribe. |
---|---|
Keywords | Croton ; evolution ; nexine ; paleobotany ; palynology ; pollen ; pollen morphology ; sexine |
Language | English |
Dates of publication | 2020-10 |
Publishing place | Elsevier B.V. |
Document type | Article |
Note | NAL-AP-2-clean |
ISSN | 0034-6667 |
DOI | 10.1016/j.revpalbo.2020.104279 |
Database | NAL-Catalogue (AGRICOLA) |
More links
Kategorien
Order via subito
This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.
Inter-library loan at ZB MED
Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.