Thanks for the detailed insights, Xavier! Really eye opening thoughts about plastid uptake. There are also non-photosynthetic "plants" that are parasitic and are often in the plantae kingdom. Im a bit embarrassed for not knowing more about the organisms I work with and am grateful there are people out there who study these informatics and taxonomic fields. I knew this thread would be worth starting! Please, if anyone else cares to chime in feel free. Am curious what others on the list think about this seemingly simple topic.
The modern taxonomy tries to incorporate the phylogenetic data we have, and so, represent the evolutionary history of life. It's not just based on opinion. But as Dennis says, the taxonomy will never provide a perfect classification, as it is based in the idea of an immutable world, and the evolution is a continuous change that's why when you talk about the evolutionary history of a given species/phyla ... you would often have to use many clade names that do not correspond to any of the taxonomic ranks. And high-rank phylogenetics aren't as easy as resolving the phylogeny within a genus or family.--
Dennis, some modern models can build phylogenies with interconnected branches to indicate HGT (Horizontal Gene transfer) events.
Following the proposal of Cavalier-Smith (2002), Plantae would include all that contain chloroplasts derived from a single endosymbiotic event in which the host cell engulfed a Cyanobacteria, and so, the plastids have two membranes. For this reason, Plantae is often referred to as Archaeplastidia, old plastids, to differentiate those taxa that have acquired plastids in a secondary endosymbiotic event, e.g. Euglenozoa.
Based on ITIS, Plantae (kingdom) would include:Although I'm a bit into phylogenetics, "plants" are outside of my scope, and I couldn't find a exact response about what to call plant that would be universally accepted right now. This is well explained in the wiki
- Viridiplantae: green algae, vascular plants, mosses, etc
- Biliphyta
- Glaucophyta
- Rhodophyta (red algae)
https://en.wikipedia.org/wiki/Plant#Current_definitions_of_Plantae
John, oxygenic or anoxygenic photosynthesis? Even if you refer to oxygenic photosynthesis you would include cyanos, which by no means are plants
On Tuesday, 12 January 2016 08:14:35 UTC+11, Sebastian wrote:It may sound like a silly question but there are some interesting overlaps and exceptions to most definitions. So guys and gals:
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