deadman_932
Posts: 3094
Joined: May 2006
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I was thinking of doing a slam on the 'article' that Granville Sewell keeps referencing (Lonnig, W-E. and .
Heinz-Albert Becker [2004] Nature Encyclopedia of Life Sciences ) But I've got other fish to fry at the moment.
What they want to 'disprove' their contention that this represents an "irreducible complex" system is the full evo pathway, I'm sure...which is being worked on but is not mentioned by that article.
Here's another one for Granville the mathematician (he's not a 'scientist,' Densey). This goes with what stevestory mentioned above:
Müller, K., Borsch, T., Legendre, L., Porembski, S., Theisen, I., Barthlott, W. (2004) Evolution of carnivory in Lentibulariaceae and the Lamiales. Plant Biology, 2004 (Vol. 6) (No. 4) 477-490 http://epbb.club.fr/Publications/phylloLentib.pdf
| Quote | As a basis for analysing the evolution of the carnivorous syndrome in Lentibulariaceae (Lamiales), phylogenetic reconstructions were conducted based on coding and non-coding chloroplast DNA (matK gene and flanking trnK intron sequences, totalling about 2.4 kb).
A dense taxon sampling including all other major lineages of Lamiales was needed since the closest relatives of Lentibulariaceae and the position of "proto-carnivores" were unknown...
Lentibulariaceae and their three genera (Pinguicula, Genlisea, and Utricularia) are monophyletic, with Pinguicula being sister to a Genlisea-Utricularia clade. Likelihood and Bayesian trees converge on Bignoniaceae as sister to Lentibulariaceae, albeit lacking good support. The "proto-carnivores" (Byblidaceae, Martyniaceae) are found in different positions among other Lamiales but not as sister to the carnivorous Lentibulariaceae, which is also supported by Khishino-Hasegawa tests. This implies that carnivory and its preliminary stages ("proto-carnivores") independently evolved more than once among Lamiales... a hypothesis on the evolutionary pathway of the carnivorous syndrome in Lentibulariaceae is presented. Extreme DNA mutational rates found in Utricularia and Genlisea are shown to correspond to their unusual nutritional specialization, thereby hinting at a marked degree of carnivory in these two genera.
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Then there's :
Laakkonen L, Jobson RW, Albert VA. A new model for the evolution of carnivory in the bladderwort plant (utricularia): adaptive changes in cytochrome C oxidase (COX) provide respiratory power. (2006) Plant Biol (Stuttg). Nov.8 (6):758-64
and
Jobson RW, Nielsen R, Laakkonen L, Wikström M, Albert VA. (2004) Adaptive evolution of cytochrome c oxidase: Infrastructure for a carnivorous plant radiation. Proc Natl Acad Sci U S A. 2004 Dec 28;101(52):18064-8.
| Quote | | Much recent attention in the study of adaptation of organismal form has centered on developmental regulation. As such, the highly conserved respiratory machinery of eukaryotic cells might seem an unlikely target for selection supporting novel morphologies. We demonstrate that a dramatic molecular evolutionary rate increase in subunit I of cytochrome c oxidase (COX) from an active-trapping lineage of carnivorous plants is caused by positive Darwinian selection. Bladderworts (Utricularia) trap plankton when water-immersed, negatively pressured suction bladders are triggered. The resetting of traps involves active ion transport, requiring considerable energy expenditure. As judged from the quaternary structure of bovine COX, the most profound adaptive substitutions are two contiguous cysteines absent in ˜99.9% of databased COX I sequences from Eukaryota, Archaea, and Bacteria. This motif lies directly at the docking point of COX I helix 3 and cytochrome c, and modeling of bovine COX I suggests the possibility of an unprecedented helix-terminating disulfide bridge that could alter COX/cytochrome c dissociation kinetics. Thus, the key adaptation in Utricularia likely lies in molecular energetic changes that buttressed the mechanisms responsible for the bladderworts' radical morphological evolution. Along with evidence for COX evolution underlying expansion of the anthropoid neocortex, our findings underscore that important morphological and physiological innovations must often be accompanied by specific adaptations in proteins with basic cellular functions. |
and a few others:
Degtjareva GV, Casper SJ, Hellwig FH, Schmidt AR, Steiger J, Sokoloff DD. Morphology and nrITS phylogeny of the genus Pinguicula L. (Lentibulariaceae), with special attention to embryo evolution. Plant Biol (Stuttg). 2006 Nov;8(6):778-90.
Reifenratha, Kerstin , Inge Theisena, Jan Schnitzlera, Stefan Porembskib and Wilhelm Barthlott (2006) Trap architecture in carnivorous Utricularia (Lentibulariaceae). Flora - Morphology, Distribution, Functional Ecology of Plants , 23 November 2006, Pages 597-605 http://www.sciencedirect.com/science....f49236e
| Quote | | Morphological data support the basal position of subgenus Polypompholyx within the genus. Some characteristics of the traps of terrestrial Utricularia multifida (subgenus Polypompholyx) differ remarkably from traps of the other species, e.g. trap-door anatomy and trap walls. This might be an indication for a primordial (non-suction) trapping mechanism in the former species, similar to that of the eel-traps of the closely related genus Genlisea. |
These suckers never learn.
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AtBC Award for Thoroughness in the Face of Creationism
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