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  • Botany 2013 - Absolute dosage and functional diversification drive majority of gene retention following polyploidy in the Compositae
    angiosperms having experienced at least one of these events or paleopolyploidies in their history In most gene pairs duplicated via paleopolyploidy paleologs one member is lost relatively quickly but some pairs of paleologs are maintained over time and these make up a significant portion of many modern plant genomes These retained genes are often biased with respect to Gene Ontology GO functional category and several models have been suggested to account for these biased retention patterns particularly the dosage or gene balance hypothesis DBH Most predictions for specific functional categories expected to be over retained in plants due to DBH following WGD come from studies of Arabidopsis thaliana but in several cases including the Compositae sunflower family patterns of biased retention following WGD are not consistent with those seen in Arabidopsis We developed a four part test using retention patterns and molecular sequence criteria that dosage sensitive loci should meet in order to determine whether paleolog retention is consistent with DBH as opposed to some other process such as absolute dosage or neo subfunctionalization We find that across Compositae more retention is consistent with the latter two processes than with DBH Broader Impacts Log in to add this item to

    Original URL path: http://www.2013.botanyconference.org/engine/search/index.php?func=detail&aid=665 (2016-02-01)
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  • Botany 2013 - Accuracy and Effect: Fossil identification and understanding evolutionary history
    had enormous impact on our understanding of diversity the development of evolutionary thought the establishment of evolutionary relationships the history of evolution in particular lineages our understanding of biogeographical patterns and also directly or indirectly upon our understanding of timing in the evolution of specific taxa and characters The value of a particular fossil in contributing to our knowledge in any of these areas depends upon the accuracy of determination of its age its precise geographical location and an adequate description of sufficient characters including synapomorphies necessary for the accurate identification of its affinities or precise phylogenetic placement Without the latter an interpretation of a particular perhaps potentially essential fossil taxon may be misleading to a degree proportional to its potential significance in any of the above applications and particularly for pinpointing divergences from established lineages We will review first appearances and revisit identifications of key sometimes controversial angiosperm and appropriate non angiosperm fossils that are relevant to any mode of addressing timing We will proceed by assessing the quality of the characters used to identify these fossils and touch upon the implications of some of these findings Broader Impacts Log in to add this item to your schedule Related

    Original URL path: http://www.2013.botanyconference.org/engine/search/index.php?func=detail&aid=619 (2016-02-01)
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  • Botany 2013 - A comparative metric for studying the efficiency of pollen tube growth
    and 75 minutes after pollination map N 15 pollen donors x 2 replicate experiments donor Lengths of 10 leading pollen tubes per carpel were measured for each time PTGR for each replicate was the mean of the longest 75 map tube minus the longest 30 map tube divided by the duration of growth and so on for the 10 tube pairs An adjacent carpel was embedded in glycol methacrylate serial sectioned and stained with aniline blue calcofluor Cross sections of tube diameters D or circumferences C and wall thicknesses W were measured at 630x magnification 1 pixel 0 0352 µm 2 Mean WPR for each replicate was calculated as the average of individual C x W x mean PTGR Between 30 map and 75 map tubes had grown primarily within substigmatic tissues Mean PTGRs ranged from 147 to 936 μm h In an ANOVA variation among pollen donors accounted for 74 of the variance whereas among replicate variation within donors was 17 The high among pollen donor variation is explained by a positive linear relationship between mean pollen donor PTGR and temperature R 2 0 725 Thickness of the intine did not differ from the proximal tube wall P 0 9302 and thickness of distal tube walls did not differ at four sequential locations P 0 4073 Mean W was 0 2288 0 0025 μm and mean D was 8 45 0 58 μm Wall area C x W did not vary with temperature and its among replicate coefficient of variation was 10 3 versus 50 2 for PTGR Wall production rate was strongly correlated with PTGR WPR 6 42 PTGR 52 63 R 2 0 97 N 28 Since wall and tube dimensions were relatively invariant over a broad range of temperatures and growth rates the 10 fold variation

    Original URL path: http://www.2013.botanyconference.org/engine/search/index.php?func=detail&aid=324 (2016-02-01)
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  • Botany 2013 - A comparative study on the reproductive biology of two Missouri native <em>Tradescantia spp</em>. (Commelinaceae)
    close proximity Hybridization is enhanced by the self incompatibility of most species in the genus and perennial nature of the plants Because of this increased frequency of cross pollinations and the potential of numerous hybrids the question of continuance of species status becomes an important concern The purpose of our study focused on the reproductive biology of Tradescantia ohiensis and Tradescantia subaspera var montana two native Missouri species that inhabit drastically distinct ecosystems Specifically we compared plant morphology and pollination systems of each species with previous studies to look for variation across species ranges over a seasonal breeding period This study was conducted at a restored prairie habitat and upland woods in eastern Missouri during the months of May through July for 2012 and 2013 Timed pollinator observations were conducted throughout the flowering season and both number and identification of floral visitors were recorded A sample of stigmas from open flowers were collected during the same time to determine insect visitation rate to flowers These samples were compared against pollen tube data from three other treatment methods that included cross pollination self pollination and pollen supplementation Our results indicate that these species are utilizing partially overlapping pollination systems and are not experiencing pollen limitation Both species are self incompatible which agrees with previous studies conducted Observations show that bees of the family group Halicadae are the main pollinator group for both species while T ohiensis was also visited by secondary pollinator groups such as beetles syrphid flies Bombus spp and Apis spp The identification of halictid bees as the main pollinators does not agree with previous observations made for the genus 50 years earlier While these two species share numerous overlapping characteristics the identification of a natural hybrid has yet to be discovered at this study site Further tests are

    Original URL path: http://www.2013.botanyconference.org/engine/search/index.php?func=detail&aid=508 (2016-02-01)
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  • Botany 2013 - A comparison of nitrogen uptake abilities of two Zingiberales species
    purposes Both plants are of the same plant family Zingiberales and exhibit the same growth patterns and physiology In addition both plants exhibit aggressive nitrogen uptake capabilities According to previous studies Thalia dealbata has the potential to be used for nitrogen mitigation for agricultural runoff Because both plants exhibit similar physiology we propose to measure and compare Thalia dealbata and Zingiber officinale under the same conditions If Zingiber officinale can

    Original URL path: http://www.2013.botanyconference.org/engine/search/index.php?func=detail&aid=176 (2016-02-01)
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  • Botany 2013 - A comprehensive overview of the evolution of the broader Campanulaceae: 925 taxa, 13 genes
    of polyphyly We have analyzed the largest dataset to date which includes 925 taxa and 13 gene regions in the chloroplast and nuclear genomes We will be discussing the significance of gaps in this large matrix and assess the utility of RADICAL Random Addition Concatenation Analysis to evaluate the phylogenetic signals contributed by the different data partitions Ultimately we will present our results on lineage relationships character reconstruction and major

    Original URL path: http://www.2013.botanyconference.org/engine/search/index.php?func=detail&aid=954 (2016-02-01)
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  • Botany 2013 - Abstract Search
    s Institutions Abstract Title Abstract Keywords Program Schedule Programs At A Glance Detailed Programs Custom Schedule Sessions Date Time Locations or Search Botany 2013 Home View Attendees Login Send Email Message From Name From Email To Hsin Hui Wu Subject Message Please type in the 5 characters between 0 and 9 and between A and F shown above and submit the form What is this for If the characters are

    Original URL path: http://www.2013.botanyconference.org/engine/search/index.php?func=contactbyemail&id=1963 (2016-02-01)
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  • Botany 2013 - A critical review of the fossil history of the Southern Hemisphere family Cunoniaceae
    outside of this region three or four if Eucryphia is considered as a member of the family in Central and South America and three in Africa including Madagascar The family is represented in the fossil record by sporadic pollen grains wood leaves and reproductive organs Placement of fossils unequivocally within Cunoniaceae is difficult because the only apomorphy for the family is the presence of a single pair of interpetiolar stipules This character is almost never observed in fossils The assignment of fossils to genera within Cunoniaceae is sometimes possible however because several cunoniaceous genera possess distinct combinations of synapomorphies that can sometimes be observed in fossil material In this contribution we will present a critical review of the complete fossil record of Cunoniaceae with an emphasis on fossils from Antarctica pollen and wood and macrofossils recently discovered in the early Eocene Laguna del Hunco flora of Chubut Province Patagonia Argentina a review of the Australian fossil record of the group was published previously by other authors The South American material includes macrofossils representing several types of cunoniaceous fruits and infructescences Although several types of fossils including wood leaves and leaf cuticles possess suites of characters consistent with Cunoniaceae only fossil fruits attributable to the genus Ceratopetalum Tribe Schizomerieae can unequivocally be assigned to the family based on combinations of synapormorphies unique to the genus These synapomorphies include the presence of an enlarged calyx that is persistent in fruit the venation pattern of the sepals presence a nectary ring that surrounds the bicarpellate and semi inferior capsule and alternisepalous stamens The Ceratopetalum fossil fruits from South America are the oldest record for the genus and therefore a suitable calibration point for the node representing the most recent common ancestor of Ceratopetalum and its sister clade We will also explore the possible

    Original URL path: http://www.2013.botanyconference.org/engine/search/index.php?func=detail&aid=150 (2016-02-01)
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