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  • Botany & Plant Biology 2007 - Abstract Search
    cells This polarity is believed to be established and maintained by vesicular delivery and endosomal cycling of proteins in this complex RAB GTPases and their interacting proteins mediate docking of vesicles at specific cellular locations and thereby facilitate targeted protein delivery We have asked if IAA transport IAA efflux proteins and dependent physiological processes are altered in scd1 mutants which have defects in a gene encoding a protein with similarity to RAB binding proteins These mutants were originally isolated for their defect in stomatal cytokinesis but also have profound cell expansion defects in roots and other cell types which is a phenotype frequently linked to auxin response or transport Two alleles were examined with a focus on scd1 1 which is a temperature sensitive mutant allele The roots of scd1 1 are shorter than wild type and have few if any lateral roots when grown at the nonpermissive temperature Gravitropism is also impaired in scd1 1 at the nonpermissive temperature The root phenotypes are also reversible when plants are returned to the permissive temperature Acropetal shoot to root IAA transport a primary source of auxin for root development is also reduced within several hours after transfer to this nonpermissive temperature

    Original URL path: http://2007.botanyconference.org/engine/search/index.php?func=detail&aid=457 (2016-02-01)
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  • Botany & Plant Biology 2007 - Abstract Search
    El Ferjani Ezzedine 1 Altered fatty acid profile of polar lipids in maize seedlings in response to excess copper A wide range of cellular responses occur when plants are exposed to heavy metal stress including changes in the membrane fatty acid composition In this study we examined the effect of excess copper 100 μM on the degree of unsaturation double bond index DBI of 18 C fatty acids and the polar lipid profiles in maize Zea mays L The level of unsaturation of total fatty acids decreased from 1 42 to 1 28 in maize roots However copper induced compositional changes of polar fatty acid composition show a general trend of increasing DBI These responses suggest that individual 18 C fatty acid classes may have specific roles in maintaining optimal membrane function enabling plant growth under copper stress The results also reveal key changes including marked decrease in total root phospholipid levels and consistent increase in the steryl lipid phospholipid SL PL ratio as well as a decrease in monogalactosyldiacylglycerol digalactosyldiacylglycerol MGDG DGDG ratio reflecting alteration of membrane permeability and fluidity In shoots the DBI obtained from phosphatidylcholine PC sulphoquinovosyldiacylglycerol SQDG and monogalactosyldiacylglycerol MGDG was increased In contrast these indices

    Original URL path: http://2007.botanyconference.org/engine/search/index.php?func=detail&aid=1167 (2016-02-01)
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  • Botany & Plant Biology 2007 - Abstract Search
    Integrating Paleobotany and Phylogenetics Magallón Susana 1 Alternative methods for integrating living and extinct taxa with missing data in phylogenies biological implications for Hamamelidaceae Saxifragales core eudicots Continued advances in our understanding of phylogenetic relationships together with the recent availability of highly informative fossils provide an unprecedented opportunity for an accurate reconstruction of angiosperm evolutionary history This potential may only be realized by integrating living and extinct taxa in a phylogenetic framework which will provide explicit information about timing and rate of phylogenetic branching morphological evolution and biogeographic history Phylogenetic integration of living and extinct taxa may nevertheless be complicated by differential availability of morphological and molecular characters Here I evaluate the effect of increasing missing data in total evidence analysis and the relative effectiveness of morphological parsimony analysis constrained with a molecular backbone using living and extinct members of Hamamelidaceae Saxifragales and a data set consisting of 55 floral characters and ca 4800 base pairs of four chloroplast molecular markers Independent analyses of morphological and molecular data result in different topologies but strongly supported incongruence does not exist A series of total evidence TE parsimony analyses evaluated the effect of increasing missing data The first TE analysis included only complete taxa and resulted in a well resolved tree in which many nodes were strongly supported Adding two living taxa lacking molecular data produced a local collapse in the clade that contains the added taxa Further inclusion of three fossils resulted in a substantial decrease in phylogenetic resolution among Hamamelidaceae A parsimony analysis of morphological data constrained with a backbone derived from well supported relationships obtained from molecular data resulted in a well resolved tree that unequivocally indicates relationships among extinct and living taxa The nested position of the fossils among living taxa indicates that a substantial amount of phylogenetic

    Original URL path: http://2007.botanyconference.org/engine/search/index.php?func=detail&aid=1395 (2016-02-01)
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  • Botany & Plant Biology 2007 - Abstract Search
    Makiling Luzon Is Philippines using the Sorensen s coefficient of community and Simpson s index of dominance On the basis of similarity of community structure and species composition based on Sorensen s coefficient of community there were nine 9 zones generated that consisted of Zone 1 at 500 m a s l Zone 2 at 520 560 m a s l Zone 3 at 580 m a s l Zone 4 at 600 620 m a s l Zone 5 at 640 m a s l Zone 6 at 660 680 m a s l Zone 7 at 700 m a s l Zone 8 at 720 740 m a s l and Zone 9 at 760 900 m a s l The zonations were further narrowed down to four groups using Simpson s index of dominance The groups were classified on the basis of increasing altitude and the dominant species in each zone Zone 1 500 620 m a s l consisted of Ctenitis dissecta Bolbitis heteroclita Dryopteris sparsa Zone Zone 2 640 m a s l consisted of Bolbitis heteroclita Bolbitis rhizophylla Asplenium cuneatum Zone Zone 3 660 680 m a s l consisted of Nephrolepis acutangula Cyathea

    Original URL path: http://2007.botanyconference.org/engine/search/index.php?func=detail&aid=600 (2016-02-01)
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  • Botany & Plant Biology 2007 - Abstract Search
    biodiversity second only to habitat destruction Biological invasions are costly to agriculture and other human endeavors Early detection rapid response EDRR is a central strategy to limit biological invasions EDRR can save tremendous amounts of labor money and ecological damage by preemptively discovering and eradicating small new infestations before eradication becomes unachievable Identification of organisms is a rate limiting factor in EDRR necessary to recognize new invaders in a geographical area Full service computerized interactive identification keys will facilitate EDRR by increasing the speed and accuracy of identifications Though the basic purpose is the same interactive keys are different than dichotomous keys and are much more powerful A new interactive key is presented here It distinguishes between the species of knapweeds and starthistles including the genus Centaurea and related look alike genera This includes a list of noxious weeds several ornamental plants and some native plants The key applies to all the native and naturalized species in the Western United States The key is currently functional but not yet in final form The target audience ranges from junior high school students to experienced professional plant taxonomists Thus it will be accessible and useful to students weed control workers land managers horticulturalists and scientists This key uses Lucid 3 3 software and will also employ Fact Sheet Fusion FSF Lucid software is arguably the best interactive key software available especially in combination with FSF The key s underlying data matrix is adapted from the 2006 Flora of North America Asteraceae treatments Images for the key are being assembled from the author s photographs and other sources Refinements are to be made before the key is released on the web as a free product Come try the key on my laptop during designated poster discussion hours Log in to add this item

    Original URL path: http://2007.botanyconference.org/engine/search/index.php?func=detail&aid=2743 (2016-02-01)
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  • Botany & Plant Biology 2007 - Abstract Search
    Tekitek Ali 1 Marzouk Brahim 3 El Ferjani Ezzedine 4 Aluminum induced alterations in polar lipid fatty acid composition in maize Zea mays L Al is one of the most important factors limiting plant growth in acid soils Al treatments 50 500 μM resulted in severe morphological alterations in roots as shown by shortening of the secondary roots in the subapical zone and swollen root apices We examined the effect of Al 100 μM on the fatty acid composition of the root and shoot polar lipids The total fatty acids in roots showed a decreased double bond index DBI This finding indicates that Al binding to membrane lipids may induce a decrease in the membrane fluidity an important aspect of Al avoidance mechanisms The total lipids TL decreased by 49 while by contrast phospholipids PL phosphatidylcholine PC and phosphatidylinositol PI increased to approximately threefold Al exposure led to a two fold increase in MGDG content as well as 69 increase in steryl lipids SL compared with control plants Moreover Al treatment led to an increase of the MGDG DGDG ratio from 0 45 to 1 06 and a decrease in the SL PL ratio from 2 64 to 1 52 These changes may be necessary for optimum membrane function under Al stress The fatty acids of shoot polar lipids particularly PG showed a similar overall increase in the unsaturation levels as indicated by the double bond index The results also indicated an increase in content of PI and PG and a decrease in PC in shoots of plants grown in the presence of Al However Al markedly reduced content of glycolipids MGDG and DGDG We conclude that Al binding and or interaction with membrane lipids may have deleterious effects on the membrane function leading to lower nutrient uptake and to

    Original URL path: http://2007.botanyconference.org/engine/search/index.php?func=detail&aid=43 (2016-02-01)
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  • Botany & Plant Biology 2007 - Abstract Search
    Botany Plant Biology 2007 Home Login Unable to connect to database 13 04 11 Unable to connect to database 13 04 11 SQL Statement is null or not a SELECT 13 04 11 Abstract Detail Recent Topics Posters Barkworth Mary 1 Anderton Laurel K 2 A Manual of Grasses for North America Several individuals have expressed interest in being able to purchase a compact treatment of the grasses of North America We hope to have such a version available for fall 2007 The compact version is based on the Flora of North America volumes It includes the all the illustrations albeit reduced to one quarter their size all the keys all the distribution maps descriptions of the tribes and genera but with common words abbreviated and comments that aid in identification for all the taxa To reduce its length the Manual does not include species descriptions references or bibliographies There have been some modifications to reflect recent research some additional illustrations and errors in the FNA volumes that were brought to our attention have been corrected The Manual will be published by Utah State University Press Log in to add this item to your schedule 1 Utah State University Intermountain

    Original URL path: http://2007.botanyconference.org/engine/search/index.php?func=detail&aid=2551 (2016-02-01)
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  • Botany & Plant Biology 2007 - Abstract Search
    Ryan 1 Archibald Jenny K 2 Mort Mark E 3 A methodological study of the utility of ISSR data for phylogeny reconstruction in populations of the South African species Crassula vaginata Crassulaceae Hypervariable markers e g AFLP ISSR etc have become a popular tool for lower level phylogenetic studies when traditional morphological and sequence based methods fail Multiple methods of analysis have been proposed on theoretical grounds but few studies have compared the results of these methods Crassula vaginata Crassulaceae is a succulent herbaceous plant species that is widespread in the mid elevation grasslands of southern Africa The level of molecular divergence in the DNA regions typically employed for lower level studies e g cpDNA spacers and nrDNA ITS between populations is low and so this species provides an ideal opportunity for testing the use of hypervariable markers for phylogeny reconstruction Fourteen populations from three regions of South Africa and Lesotho were sampled Inter Simple Sequence Repeat ISSR data were generating using automated techniques and these data were analyzed using a variety of methods including one distance based method and three parsimony methods Among the three parsimony methods Fitch parsimony provided resolution that most closely reflected both population and regional cohesion among individuals and was also the most consistent with estimate inferred from distance methods Dollo parsimony analysis resulted in clustering of individuals into populations but exhibited greater mixing of populations from different regions than the Fitch or distance methods Camin Sokal parsimony analysis resulted in the least population cohesion and failed to resolve the ingroup as monophyletic indicating that it is a less desireable approach to analyzing hypervariable markers We conclude that the distance and Fitch parsimony methods are the most appropriate for phylogenetic inference of ISSR data in C vaginata Log in to add this item to your

    Original URL path: http://2007.botanyconference.org/engine/search/index.php?func=detail&aid=1787 (2016-02-01)
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