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Doyle (1978, 1994, 2005, 2006, 2008, 2012), Friis et al. (2008), Berendse and Scheffer (2009), Friedman (2009), Specht and Bartlett (2009), E. A differing proposal by Dahlgren and Clifford (1982) suggests: "The ancestors of the monocotyledons were probably shrublets or subshrubs which by environmental conditions (a pronounced alternation between wet and dry periods) evolved compact underground stems, mainly short or long rhizomes from which herbaceous aerial stems were developed ..." The preceding quotation is from page 344 of R. Class 1c resin constituents associated with Mesozoic angiosperm amber are known from 320 million year old (Paleozoic) amber samples (Bray and K. Almost certainly, accomplished studies of the Amborella trichopoda genome, though useful in disentangling aspects of the evolution of GRNs and horizontal transfer (HT), will not help paleobiologists determine the origin(s) of angiosperms. 2014), and detailed analyses of paleobiological data (Labandeira 2014). If fertile spur shoots are demonstrably ancient organs known from late Paleozoic seed plant fossils then how could the flower possibly originate in the late Mesozoic? "The flower remains ill-defined and its mode (or modes) of origin remain hotly disputed; some definitions and hypotheses of evolutionary relationships preclude a role for the flower in delimiting the angiosperms." The preceding statement is from the abstract on page 3471 of R. Floral morphologies are deeply-conserved in angiosperms according to Melzer et al.
I discuss potential coevolution of insect and seed plant helix-turn-helix proteins, specifically Engraled and Leafy enzymes that bind to cis-regulatory promoters controlling downstream expression of genes determining paedomorphic insect body patterns and plant cone and floral organ development. (2017) report low support ( The Fiji Islands have long been of interest to biogeographers (Raven and Axelrod 1974, Thorne 1986, Morley 2001), to geologists as a tectonic puzzle (Rodda and Kroenke 1984), and to botanists as a "cradle of flowering plants" (title, Chapter 12, Takhtajan 1969), where some "missing links in the chain of angiosperm phylogeny" are known (page 141, Between Assam and Fiji, Takhtajan 1969). There are several conifers endemic to the Fiji Archipelago including Agathis vitiensis, Acmopyle sahniana, Dacrycarpus imbricatus, Dacrydium nausoriense, Dacrydium nidulum, and Decussocarpus vitiensis. The only known species at the time, Degeneria vitiensis (pictured below), combines a number of primitive features that have ignited many debates (I. Some paleontologists regard the problem of flowering plant origins, "... Juvenile hormone and its homologs are integral in vitellogenesis (Hartfelder 2000), regulation of moult cycles (Truman and Riddiford 2002), and caste development and behavior in social Hymenoptera (Guidugli et al. Were bioactive brassinolides and sesquiterpenes manufactured by Paleozoic seed plants used as chemical warfare agents to affect growth, development, and behaviour of herbivorous insects? Another avenue of deduction somehow ties-in insect evo-devo of wings from gill halteres with increases in atmospheric oxygen during the De CARB. The place and time to begin a molecular phylogenetic analysis is the late Frasnian-Famennian Age hypoxic icehouse that extended into the Tornaisian Age of the Carboniferous Period. Could paleoecologists benefit by studying experimental, 3-D printed artificial constructs of shoots and protoflowers in theoretical morphospace? By measuring and scaling detached and shed foliar and cone- floral-organs, and by combining these data with studies of permineralizations, "fingerprints of developmental regulation" (quoted from page 723, Sanders et al. The image to the right is the passive insect trapping flowering plant, Darlingtonia californica (Sarraceniaceae, Ericales, Asteranae), photographed by the author at a seep on Eight Dollar Mountain located in the Klamath Region of western North America. The International Journal of Plant Sciences devotes most of Number 7 of Volume 169 (2008) toward the ongoing search for the earliest flowers, based on an international symposium held during the summer of 2007 at the Swedish Museum of Natural History (von Balthazar et al. More than twenty articles in Volume 96, Number 1 of the American Journal of Botany explore the origin, evolution, and radiation of flowering plants to celebrate the Charles Darwin Bicentennial (Stockey et al. Conrad Labandeira's several reviews on fossil insect-plant phytophagous associations (Labandeira 2000, 2006, 2007 [two papers], 2010, 2014) contain extensive bibliographies. 2008) and assembly of chitin and cuticle proteins into the exoskeleton (Charles 2010, Moussian 2010). Another Hox protein Abd-B, when combined with the Dsx enzyme, represses expression of the wg gene in fruit flies (W. I also add hexamerin moulting storage proteins which are related to hemocyanin respiratory enzymes (Burmester et al. 2006, Burmester and Hankein 2007), JH esterases, vitellogenin genes and yolk proteins (Isoe and Hagedorn 2007), pheromone chemoreceptors (Robertson and Wanner 2006), and certain nuclear receptor proteins (Bonneton et al. 2008) including ultraspiracle, and ecdysone inducible TFs to the list of molecular developmental tools among early diverging arthropod lineages. The first appearance of insect wings in the rock record of the Paleozoic Era has yet to be established. Arthropod body allometry is intertwined with development of larval and imaginal disc tissues (Stern and Emlen 1999, Shingleton et al. 1997), Ubx (Pavlopoulos and Akam 2011), and the field-specific selector gene necessary for limb development in Drosophila (Diptera) known as dll (S. Fushi-tarazu protein encoded by the ftz gene, intracellular tertiary enzyme structure folding environments, and the apparent flexibility of Ftz and other Hox proteins in the evolution of arthropods, are discussed in a recent review by Merebet and Hudry (2011). These studies, among others underway or already published by Sean Carroll and colleagues, underscore the importance of Hox proteins in evolution of the arthropod tool kit. Mesozoic paleogeography and early angiosperm history. On the other hand, certain hemimetabolous bugs (Hemiptera) possess abdominal stretch receptors that activate secretion of PTTH (Nijhout 2003). 2005, among others) of the Drosophila Hox complex are: Ancestral arthropods possess two additional homeotic selector genes of the Hox cluster that together comprise the HOM-C, ten gene complex (see discussion in Negre et al. These additional genes are: Genomic analyses suggest that derived winged insects lost functional copies of ftz and Hox3 through disintegration of the HOM-C complex (Negre et al. Duplication of the Hox3 gene of ancestral Cyclorrhaphan flies gave rise to two maternal effect genes, bcd and zen (Stauber et al. Based upon this study it is important to include Hox3 as part of the ancestral diverging insect developmental tool kit. Possible candidates for the early divergent insect developmental tool kit might include certain homeotic selector genes of the Hox complex such as homologs and paralogs of abd-A, Abd-B, Hox3, pb, Scr (Rogers et al. 2002) are probably behind many insect body plan novelties seen in the paleontologic record of the past 400 million years of arthropod and crustacean evolution (Pavlopoulos and Akam 2011, Pavlopoulos and Averof 2002).
Plant evolution occurs as variation in genetic and epigenetic developmental processes is winnowed by ecology..." The preceding quotation is from page 161 of P. Once JH circulating in the hemolymph is destroyed by juvenile hormone esterases, then PTTH secretion resumes under circadian (22-24 hour) photoperiodic control (Nijhout 2003). The importance of Ubx protein encoded by the Ubx gene in the early divergent insect developmental tool kit cannot be neglected in the present analysis since significant changes in the carboxy-terminal (C-terminal) region (Galant and Carroll 2002) and serine/threonine phosphorylation sites (Ronshaugen et al. The image above is the northwestern face of the Korombasabasaga Range, Viti Levu Island, Fiji as viewed from the road between Namosi and Wainimakutu villages. A review of neotenous development in termites is available (Korb and Hartfelder 2008). Structurally similar to bioactive plant brassinosteroids, 20E-ecdysone induces a cascade of TF biosynthesis important in the regulation of insect development (Truman and Riddiford 2002, De Loof 2008). One line of paleobiological thinking hypothesizes that insects took flight to exploit new habitat. Did ingestion of seed plant brassinosteroids by pterygote insects affect the evo-devo of wings from thoracic limb pads and JH signaling? The evo-devo of insect caste polyphenism is reviewed by Emlen and Nijhout (2000). Thummel and Chory (2002) point to a possible coevolutionary connection between the 20E-ecdysone/cytochrome P biosynthetic machinery of insect antagonists and seed plant hosts. Further, changes in the arthropod homeodomain and evolution of new protein motifs led to new Hox developmental tool kit functions in certain insect lineages (S. The paleobiology of insect flight in relation to the advent of arthropod-seed plant mutualisms remains unexplained. Studies of evolving allometries and body plans might help us understand a possible coevolutionary origin of angiosperms and certain clades of holometabolous phytophagous insect antagonists. Molecular control over arthropod growth varies among the major clades of insects (Grimaldi and Engel 2005). 2007) could potentially be discerned in the fossil record. (2005) review molecular evolution of homeotic genes and homeodomain TFs needed to understand regulation of body ground plan development in phytophagous arthropod antagonists. (1985), Labandeira and Sepkoski (1993), Farrell (1998), Labandeira (1998), Danforth and Ascher (1999), Grimaldi (1999), Wilf et al. 2009, Specht and Bartlett 2009, Licausi 2011, Glover 2014, among others). Evidence of arthropod-plant interactions in the Upper Triassic of the Southwestern United States.