2,448,517 research outputs found
Mycosphaerella and Teratosphaeria diseases of Eucalyptus; easily confused and with serious consequences
No full textThe Mycosphaerella complex accommodates thousands of taxa. Many of these species are economically important plant pathogens, notably on native and commercially propagated Eucalyptus species where they cause a wide range of disease symptoms including leaf spot, leaf blotch, shoot blight and stem cankers. Some of these diseases represent major impediments to sustainable Eucalyptus forestry in several countries where infection by Mycosphaerella and Teratosphaeria species can result in reduction of wood volume and in severe cases tree death. Extensive research has been conducted on these disease complexes over the past 40 years. The incorporation of DNA-based molecular techniques has made it possible to define and to better understand the differences between the Mycosphaerella and Teratosphaeria species occurring on Eucalyptus. These studies have also enabled refinement of anamorph and teleomorph generic concepts for the genera and thus facilitated the more accurate identification of species. They have also promoted a more lucid understanding of the biology, life cycles, population biology and epidemiology of the most important pathogens in the group
Apoteósis de don Pedro Calderón de la Barca
No full text"Esta Apoteósis, escrita espresamente [sic] para representarse en el teatro del Príncipe con motivo de la exhumación de los huesos del célebre Poeta D. Pedro Calderón de la Barca, ..." (p. [4]
Cylindrocarpon root rot: multi-gene analysis reveals novel species within the Ilyonectria radicicola species complex
No full textIlyonectria radicicola and its Cylindrocarpon-like anamorph represent a species complex that is commonly associated with root rot disease symptoms on a range of hosts. During the course of this study, several species could be distinguished from I. radicicola sensu stricto based on morphological and culture characteristics. DNA sequence analysis of the partial ß-tubulin, histone H3, translation elongation factor 1-a and nuclear ribosomal RNA-Internal Transcribed Spacer (nrRNA-ITS) genes were employed to provide further support for the morphological species resolved among 68 isolates associated with root rot disease symptoms. Of the various loci screened, nrRNA-ITS sequences were the least informative, while histone H3 sequences were the most informative, resolving the same number of species as the combined dataset across the four genes. Within the Ilyonectria radicicola species complex, 12 new taxa are delineated occurring on a diverse range of hosts, the most common being Cyclamen, Lilium, Panax, Pseudotsuga, Quercus and Vitis
Phylogenetic lineages in the Capnodiales
No full textThe Capnodiales incorporates plant and human pathogens, endophytes, saprobes and epiphytes, with a wide range of nutritional modes. Several species are lichenised, or occur as parasites on fungi, or animals. The aim of the present study was to use DNA sequence data of the nuclear ribosomal small and large subunit RNA genes to test the monophyly of the Capnodiales, and resolve families within the order. We designed primers to allow the amplification and sequencing of almost the complete nuclear ribosomal small and large subunit RNA genes. Other than the Capnodiaceae (sooty moulds), and the Davidiellaceae, which contains saprobes and plant pathogens, the order presently incorporates families of major plant pathological importance such as the Mycosphaerellaceae, Teratosphaeriaceae and Schizothyriaceae. The Piedraiaceae was not supported, but resolves in the Teratosphaeriaceae. The Dissoconiaceae is introduced as a new family to accommodate Dissoconium and Ramichloridium. Lichenisation, as well as the ability to be saprobic or plant pathogenic evolved more than once in several families, though the taxa in the upper clades of the tree lead us to conclude that the strictly plant pathogenic, nectrotrophic families evolved from saprobic ancestors (Capnodiaceae), which is the more primitive stat
Calonectria species associated with cutting rot of Eucalyptus
No full textDecline in the productivity of Eucalyptus hybrid cutting production in the Guangdong Province of China is linked to cutting rot associated with several Calonectria spp. The aim of this study was to identify these fungi using morphological and DNA sequence comparisons. Two previously undescribed Calonectria spp., Ca. pseudoreteaudii sp. nov. and Ca. cerciana sp. nov. were identified together with Ca. pauciramosa. Calonectria pseudoreteaudii resides in the Ca. reteaudii complex and Ca. cerciana is closely related to Ca. morganii. Connected to the discovery of Ca. pseudoreteaudii, species in the Ca. reteaudii complex were re-considered and the group is shown to accommodate two cryptic species. These originate from Australia and are described as Ca. queenslandica sp. nov. and Ca. terrae-reginae sp. nov
Multi-gene analysis of Pseudocercospora spp. from Iran
No full textBakhshi, Mounes, Arzanlou, Mahdi, Babai-Ahari, Asadollah, Groenewald, Johannes Z., Crous, Pedro W. (2014): Multi-gene analysis of Pseudocercospora spp. from Iran. Phytotaxa 184 (5): 245-264, DOI: 10.11646/phytotaxa.184.5.1, URL: http://dx.doi.org/10.11646/phytotaxa.184.5.
Re-evaluation of Cryptosporiopsis eucalypti and Cryptosporiopsis-like species occurring on Eucalyptus
No full textCryptosporiopsis eucalypti is a common follicolous pathogen of Eucalyptus species in tropical and temperate regions where these trees are grown in plantations. The taxonomy of C. eucalypti is confused by the fact that it is phylogenetically unrelated to the type species of Cryptosporiopsis (Cryptosporiopsis nigra = C. scutellata, Helotiales). The aim of this study was to resolve the taxonomic position of C. eucalypti based on morphology and phylogenetic inference. Thirty-two Eucalyptus leaf samples with symptoms typical of C. eucalypti infection were collected from 10 tropical and temperate countries across four continents. Cultures were established from single conidia, as well as from ascospores of a previously unreported teleomorph state. DNA sequences were obtained for the 28 S nrDNA, the internal transcribed spacers of the nrDNA operon, and beta-tubulin regions to determine generic and species-level relationships. DNA-sequence analysis showed that conidial and ascospore isolates of C. eucalypti have low intraspecific variation, although two collections from Australia and one from Uruguay represented two novel taxa. Based on the newly collected teleomorph stage, as well as the phylogenetic data, C. eucalypti is shown to represent a new genus closely related to Plagiostoma (Gnomoniaceae, Diaporthales) for which the names Pseudoplagiostoma gen. nov. and Pseudoplagiostomaceae fam. nov. (Diaporthales) are introduced. Two new species of Cryptosporiopsis (Dermateaceae, Helotiales) on Eucalyptus from Australia and California (USA) are also described
Letter from [George H. Hand], Rancho San Pedro to Mr. [William] J. Tachibana, January 30, 1924
No full textRefers to an enclosed lease agreement for 18.37 acres of the Maria de los Reyes D. de Francis allotment of Rancho San Pedro. Refers to a pending survey on the land
La Gramatica Griega escrita en lengua Castellana : para que dende luego puedan los niños aprender la lengua griega juntamente con la latina conforme al consejo de Quintiliano con el aiuda i fauor de la vulgar
No full textEsta Gramática griega, impresa en Zaragoza, aparece normalmente junto con la Gramática griega, impresa en Madrid por Pedro Madrigal en el año 1587Copia digital. Madrid : Ministerio de Cultura. Subdirección General de Coordinación Bibliotecaria, 2008Sign.: A-I\p8\s, K\p4\s, A-D\p8\s, E-M\p4\s, a-d\p4\sPort. con grab. xil
Pedro y el Primado romano
No full textCercano y amigo, a veces impetuoso, otras cobarde. La Iglesia lo venera como el primer Papa, el Vicario de Cristo, el guardián de las llaves. En fin, es mucho lo que en la Biblia y en la Iglesia se ha dicho de este hombre que genera curiosidad y dudas. Esto último es lo que nos llevo a realizar el presente trabajo. Al principio la duda personal se centraba en la aptitud y preparación de Pedro especialmente frente a Pablo, pues es claro que a nivel de preparación intelectual, Pablo llevaba una larga ventaja a Pedro. Teniendo en cuenta que a la larga la figura petrina descolló más que la paulina, por lo menos a efectos prácticos en la dirección de la iglesia (no tanto en la teología eclesial en la que sin duda la imagen de Pablo es gigante), la pregunta será cuál fue la razón para que sea Pedro y no Pablo al que reconocemos como fundador de la Iglesia de Roma. Está duda nos llevó a preguntarnos sobre lo especial” de Pedro para que fuera el guía de una Iglesia que nacía y luego la imagen y el símbolo de la dirección misma de la iglesia. No podíamos encontrar respuesta satisfactoria ya que eran claras las alusiones a las limitaciones de de Pedro o su conocidísima huida en el momento de prendimiento de Cristo. Aunque también se destacan momentos en los que se intuía su capacidad1. La respuesta por lo tanto no estaba en sus cualidades humanas, además, así planteada la cuestión, era muy superficial la respuesta y no pasaba de ser un mero entretenimiento. Las cosas se las debía buscar con más profundidad, hurgando un poco más. Por lo tanto, el punto de partida no podía ser simplemente el de la curiosidad sobre la idoneidad de Pedro. La clave está entonces en el mismo Jesús, pues es él quien lo escoge. Si hacemos caso a sus mismas palabras, dirigidas precisamente a Pedro: tus pensamientos son los de los hombres, no los de Dios”2, intuimos que ese mismo es el criterio que usa para escoger a Pedro. Dios mira más allá de las..
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