cycadophyta

Summary

Summary: A class of vascular seed plants also known as gymnosperms in the subdivision spermatophytina. They have large cones and pinnate leaves. Examples are pines, spruces, cedars and sequoias.

Top Publications

  1. Nagalingum N, Marshall C, Quental T, Rai H, Little D, Mathews S. Recent synchronous radiation of a living fossil. Science. 2011;334:796-9 pubmed publisher
    ..These data reject the hypothesized role of dinosaurs in generating extant diversity and the designation of today's cycad species as living fossils...
  2. Salas Leiva D, Meerow A, Calonje M, Griffith M, Francisco Ortega J, Nakamura K, et al. Phylogeny of the cycads based on multiple single-copy nuclear genes: congruence of concatenated parsimony, likelihood and species tree inference methods. Ann Bot. 2013;112:1263-78 pubmed publisher
  3. Brenner E, Stevenson D, Twigg R. Cycads: evolutionary innovations and the role of plant-derived neurotoxins. Trends Plant Sci. 2003;8:446-52 pubmed
    ..Because of their unique placement in terrestrial plant evolution, molecular studies should help to define the origins of structures that led to the rise of seed plants and the role of neurotoxic compounds that are found in cycads...
  4. Chaw S, Walters T, Chang C, Hu S, Chen S. A phylogeny of cycads (Cycadales) inferred from chloroplast matK gene, trnK intron, and nuclear rDNA ITS region. Mol Phylogenet Evol. 2005;37:214-34 pubmed
    ..The matK gene and ITS/5.8S region contain more useful information than the trnK intron in addressing phylogeny. Redelimitations of Zamiaceae, Stangeriaceae, subfamily Encephalartoideae and subtribe Macrozamiineae are necessary...
  5. Wu C, Chaw S. Evolutionary Stasis in Cycad Plastomes and the First Case of Plastome GC-Biased Gene Conversion. Genome Biol Evol. 2015;7:2000-9 pubmed publisher
    ..Cycads (Cycadophyta) are the second largest gymnosperm group...
  6. Alekseev V, Bukejs A. First fossil representatives of Pharaxonothinae Crowson (Coleoptera: Erotylidae): indirect evidence for cycads existence in Baltic amber forest. Zootaxa. 2017;4337:413-422 pubmed publisher
    ..The occurrence of representatives of the Recent cycad-specialized genus in Baltic amber can indirectly indicate the presence of their host plants (Cycadales: Cycadophyta: Cycadopsida) in the Eocene amber forest.
  7. Ferguson D, Crowe M, McLaughlin L, Gaschen F. Survival and prognostic indicators for cycad intoxication in dogs. J Vet Intern Med. 2011;25:831-7 pubmed publisher
    ..Cycad palms are commonly used in landscaping and ingestion by dogs can cause disease or death...
  8. Duncan M, Marini A. Debating the cause of a neurological disorder. Science. 2006;313:1737 pubmed
  9. Roemer R, Terry I, Chockley C, Jacobsen J. Experimental evaluation and thermo-physical analysis of thermogenesis in male and female cycad cones. Oecologia. 2005;144:88-97 pubmed
    ..lucida. This study provides new information regarding the energetics of cycad cones that is relevant to understanding the interactions of the plant traits with their obligate pollinators' behavior...

More Information

Publications49

  1. Zonneveld B. Genome sizes for all genera of Cycadales. Plant Biol (Stuttg). 2012;14:253-6 pubmed publisher
    ..They vary from 36.1 to 64.7 pg, covering the whole range of genome sizes (excluding the genome of Cycas). Hence, their does not seem to be a correlation between genome size and the number of chromosomes...
  2. Ranade S, Lin Y, Zuccolo A, Van de Peer Y, García Gil M. Comparative in silico analysis of EST-SSRs in angiosperm and gymnosperm tree genera. BMC Plant Biol. 2014;14:220 pubmed publisher
  3. Ollerton J, Coulthard E. Paleontology. Evolution of animal pollination. Science. 2009;326:808-9 pubmed publisher
  4. Jiang P, Chen J, Chiu S, Tzen J. Stable oil bodies sheltered by a unique caleosin in cycad megagametophytes. Plant Physiol Biochem. 2009;47:1009-16 pubmed publisher
    ..These results suggest that stable oil bodies in cycad megagametophytes are mainly sheltered by a unique structural protein caleosin...
  5. Rosen J, Hellenas K. Determination of the neurotoxin BMAA (beta-N-methylamino-L-alanine) in cycad seed and cyanobacteria by LC-MS/MS (liquid chromatography tandem mass spectrometry). Analyst. 2008;133:1785-9 pubmed publisher
    ..Instead, the presence of alpha-,gamma-diamino butyric acid (DAB), an isomer of BMAA, was confirmed in one sample. The possible implications of this finding are discussed...
  6. Hayes M, Hanson M. High conservation of a 5' element required for RNA editing of a C target in chloroplast psbE transcripts. J Mol Evol. 2008;67:233-45 pubmed publisher
    ..Putative editing cis-elements were uncovered in the 5' UTRs near editing sites psbL C2 and ndhD C2...
  7. Cardinif F, Bonzi L. Carotenoid composition and its chemotaxonomic significance in leaves of ten species of the genus Ceratozamia (Cycads). J Plant Physiol. 2005;162:517-28 pubmed
    ..It is also constituted of four others, which are completely novel (ceratoxanthin, ceratozamiaxanthin, kuesteriaxanthin, and ceratoxanthone). Some hypotheses about their presence and function are presented...
  8. Banack S, Murch S, Cox P. Neurotoxic flying foxes as dietary items for the Chamorro people, Marianas Islands. J Ethnopharmacol. 2006;106:97-104 pubmed
    ..Other animals that forage on cycad seeds may also provide BMAA inputs into the traditional Chamorro diet...
  9. Sass C, Little D, Stevenson D, Specht C. DNA barcoding in the cycadales: testing the potential of proposed barcoding markers for species identification of cycads. PLoS ONE. 2007;2:e1154 pubmed
    ..We suggest a workflow for DNA barcoding, including database generation and management, which will ultimately be necessary if we are to succeed in establishing a universal DNA barcode for plants...
  10. Roodt D, Lohaus R, Sterck L, Swanepoel R, Van de Peer Y, Mizrachi E. Evidence for an ancient whole genome duplication in the cycad lineage. PLoS ONE. 2017;12:e0184454 pubmed publisher
    ..The most parsimonious explanation would be that this whole genome duplication event was shared between both species and had occurred prior to their divergence, about 300 million years ago...
  11. Hollingsworth P. Refining the DNA barcode for land plants. Proc Natl Acad Sci U S A. 2011;108:19451-2 pubmed publisher
  12. Yagi F. Azoxyglycoside content and beta-glycosidase activities in leaves of various cycads. Phytochemistry. 2004;65:3243-7 pubmed
    ..However, in M. miquelii leaf extract, hydrolytic activity toward macrozamin was high and the activity toward cycasin was very low, though only cycasin was found in the leaves of this species...
  13. Quirk J, Andrews M, Leake J, Banwart S, Beerling D. Ectomycorrhizal fungi and past high CO2 atmospheres enhance mineral weathering through increased below-ground carbon-energy fluxes. Biol Lett. 2014;10: pubmed publisher
    ..Our findings provide mechanistic insights into the involvement of EM-associating forest trees in strengthening biological feedbacks on the geochemical carbon cycle that regulate atmospheric CO2 over millions of years...
  14. Miller G. Neurodegenerative disease. Guam's deadly stalker: on the loose worldwide?. Science. 2006;313:428-31 pubmed
  15. Harrison N, Davis R, Helmick E. DNA extraction from arborescent monocots and how to deal with other challenging hosts. Methods Mol Biol. 2013;938:147-58 pubmed publisher
    ..The protocol requires minimal processing of excised tissues and yields phytoplasma DNA preparations in suitable quantity for reliable detection by nested PCR assays...
  16. Papaefthimiou D, Hrouzek P, Mugnai M, Lukesova A, Turicchia S, Rasmussen U, et al. Differential patterns of evolution and distribution of the symbiotic behaviour in nostocacean cyanobacteria. Int J Syst Evol Microbiol. 2008;58:553-64 pubmed publisher
  17. Miller G. Neurodegenerative disease. From cycad flour, a new suspect emerges. Science. 2006;313:431 pubmed
  18. Schwilk D. Dimensions of plant flammability. New Phytol. 2015;206:486-8 pubmed publisher
  19. Cox P, Banack S. A nonprotein amino acid and neurodegeneration. Science. 2006;314:1242 pubmed
  20. Choo Y, Ma A, Chuah C, Khor H, Bong S. A developmental study on the appearance of tocopherols and tocotrienols in developing palm mesocarp (Elaeis guineensis). Lipids. 2004;39:561-4 pubmed
    ..alpha-T was detected throughout the palm fruits' maturation process, whereas unsaturated tocotrienols were found only in ripe palm fruits. These developmental results indicate that tocotrienols are synthesized between 16 and 20 WAA...
  21. Wu C, Chaw S, Huang Y. Chloroplast phylogenomics indicates that Ginkgo biloba is sister to cycads. Genome Biol Evol. 2013;5:243-54 pubmed publisher
    ..In summary, the factors we surveyed did not affect results inferred from analyses of AA sequences. Congruent topologies in our AA trees give more confidence in supporting the ginkgo-cycad sister-group hypothesis...
  22. Roemer R, Terry L, Walter G. Unstable, self-limiting thermochemical temperature oscillations in Macrozamia cycads. Plant Cell Environ. 2008;31:769-82 pubmed publisher
  23. Roemer R, Booth D, Bhavsar A, Walter G, Terry L. Mathematical model of cycad cones' thermogenic temperature responses: inverse calorimetry to estimate metabolic heating rates. J Theor Biol. 2012;315:87-96 pubmed publisher
    ..It thus provides an additional tool to facilitate field and laboratory investigations of the bio-physics of thermogenic plants...
  24. Adhikari P, Shin J, Lee J, Hu J, Zhu X, Akoh C, et al. Production of trans-free margarine stock by enzymatic interesterification of rice bran oil, palm stearin and coconut oil. J Sci Food Agric. 2010;90:703-11 pubmed publisher
    ..Trans-free interesterified fat was produced for possible usage as a spreadable margarine stock. Rice bran oil, palm stearin and coconut oil were used as substrates for lipase-catalyzed reaction...
  25. Singh A, Nath L. Synthesis and evaluation of physicochemical properties of cross-linked sago starch. Int J Biol Macromol. 2012;50:14-8 pubmed publisher
    ..TGA report exhibited higher thermal stability, which makes it suitable for various industrial applications. Swelling behavior showed high swelling at low temperature (30 and 60°C) as compared to high temperature (90°C)...
  26. Kisby G, Fry R, Lasarev M, Bammler T, Beyer R, Churchwell M, et al. The cycad genotoxin MAM modulates brain cellular pathways involved in neurodegenerative disease and cancer in a DNA damage-linked manner. PLoS ONE. 2011;6:e20911 pubmed publisher
    ..Exposure to MAM-related environmental genotoxins may have relevance to the etiology of related tauopathies, notably, Alzheimer's disease...
  27. Thajuddin N, Muralitharan G, Sundaramoorthy M, Ramamoorthy R, Ramachandran S, Akbarsha M, et al. Morphological and genetic diversity of symbiotic cyanobacteria from cycads. J Basic Microbiol. 2010;50:254-65 pubmed publisher
    ..A phylogenetic analysis based on 16S rRNA gene sequence analysis revealed that most of the symbiotic cyanobacterial isolates fell into well-separated clades...
  28. Luna R, Epperson B, Oyama K. High levels of genetic variability and inbreeding in two Neotropical dioecious palms with contrasting life histories. Heredity (Edinb). 2007;99:466-76 pubmed
    ..Demographic studies indicate that this pattern could be explained by low reproductive frequency among individuals and over years in C. elatior and by reproductive dominance in C. tepejilote...
  29. Baulina O, Lobakova E. [Heterocysts with reduced cell walls in populations of cycad cyanobionts]. Mikrobiologiia. 2003;72:806-15 pubmed
    ..The substances that constitute the sheath and the outer layer are likely to be synthesized intracellularly and then released with the aid of membrane-bounded vesicles or by channels in the cytoplasmic membrane...
  30. Li Z, De La Torre A, Sterck L, Canovas F, Avila C, Merino I, et al. Single-Copy Genes as Molecular Markers for Phylogenomic Studies in Seed Plants. Genome Biol Evol. 2017;9:1130-1147 pubmed publisher
    ..Our phylogenomic analyses demonstrate that, in general, single-copy genes can uncover both recent and deep divergences of seed plant phylogeny...
  31. Coiro M, Pott C. Eobowenia gen. nov. from the Early Cretaceous of Patagonia: indication for an early divergence of Bowenia?. BMC Evol Biol. 2017;17:97 pubmed publisher
  32. Butler R, Barrett P, Kenrick P, Penn M. Testing co-evolutionary hypotheses over geological timescales: interactions between Mesozoic non-avian dinosaurs and cycads. Biol Rev Camb Philos Soc. 2009;84:73-89 pubmed publisher
  33. Peñalver E, Labandeira C, Barron E, Delclòs X, Nel P, Nel A, et al. Thrips pollination of Mesozoic gymnosperms. Proc Natl Acad Sci U S A. 2012;109:8623-8 pubmed publisher
    ..This association provides direct evidence of specialized collection and transportation of pollen grains and likely gymnosperm pollination by 110-105 million years ago, possibly considerably earlier...
  34. Cheng R, Banack S. Previous studies underestimate BMAA concentrations in cycad flour. Amyotroph Lateral Scler. 2009;10 Suppl 2:41-3 pubmed publisher
    ..These data support a link between ALS/PDC and exposure to BMAA...
  35. Lins U, Barros C, Da Cunha M, Miguens F. Structure, morphology, and composition of silicon biocomposites in the palm tree Syagrus coronata (Mart.) Becc. Protoplasma. 2002;220:89-96 pubmed
    ..Vacuolar granules were amorphous and composed of silicon and oxygen, suggesting they consist of amorphous silica biominerals. No nitrogen, indicative of organic matter, was detected in the granules...
  36. Knodel J, Olson D, Hanson B, Henson R. Impact of planting dates and insecticide strategies for managing crucifer flea beetles (Coleoptera: Chrysomelidae) in spring-planted canola. J Econ Entomol. 2008;101:810-21 pubmed
    ..The best insecticide strategy for management of flea beetle was the high rate of insecticide seed treatment plus a foliar insecticide applied at 21 d after planting, regardless of planting date...
  37. Zgurski J, Rai H, Fai Q, Bogler D, Francisco Ortega J, Graham S. How well do we understand the overall backbone of cycad phylogeny? New insights from a large, multigene plastid data set. Mol Phylogenet Evol. 2008;47:1232-7 pubmed publisher
  38. Downie D, Donaldson J, Oberprieler R. Molecular systematics and evolution in an African cycad-weevil interaction: Amorphocerini (Coleoptera: Curculionidae: Molytinae) weevils on Encephalartos. Mol Phylogenet Evol. 2008;47:102-16 pubmed publisher
    ..A complex pattern of host shifts onto both closely related and more distantly related hosts is suggested...
  39. Baulina O, Lobakova E. [Atypical cell forms overproducing extracellular substances in population of cycad cyanobionts]. Mikrobiologiia. 2003;72:792-805 pubmed
    ..The physiological role of these specific cell forms and the factors that induce their development and death in the cell populations of cyanobionts are discussed...
  40. Hirao K, Igarashi K. Effects of sago starch content in the diet on lipid peroxidation and antioxidative enzyme activities in rats. J Nutr Sci Vitaminol (Tokyo). 2003;49:76-9 pubmed
    ..From these results, it was suggested that a higher ratio of sago starch in the diet may be useful to keep the in vivo oxidative status at a lower level...