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Does disturbance determines the prevalence of dwarf mistletoe (Arceuthobium, Santalales: Viscaceae) in Central Mexico? RChHN
QUEIJEIRO-BOLAÑOS,MÓNICA E; CANO-SANTANA,ZENÓN; CASTELLANOS-VARGAS,IVÁN.
Large vegetation disturbance rates have been reported in the "Zoquiapan y Anexas" Protected Natural Area in Central Mexico. Arceuthobium globosum and A. vaginatum coexist within this area and have a deleterious impact on Pinus hartwegii. This study seeks to understand the relationship between this disturbance and the two dwarf mistletoe species prevalent in this zone. Twenty-four plots measuring 60 x55 m containing P. hartwegii trees were selected. Within these plots, the physical features of the land, the density of host and non-host trees, the prevalence of each mistletoe species, and six disturbance indicators were recorded. We found that A. vaginatum infests up to 47 % of P hartwegii trees and that its prevalence is affected positively by the slope,...
Tipo: Journal article Palavras-chave: Disturbance indicators; Interactions; Logging; Parasitic plants; Pinus hartwegii.
Ano: 2013 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2013000200007
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Genetic diversity in two variants of Orobanche gracilis Sm. [var. gracilis and var. deludens (Beck) A. Pujadas] (Orobanchaceae) from different regions of Spain Electron. J. Biotechnol.
Román,Belén; Hernández,Rosabell; Pujadas-Salvá,Antonio José; Cubero,José Ignacio; Rubiales,Diego; Satovic,Zlatko.
The pattern of genetic variation among populations of two Orobanche gracilis Sm. taxa (var. gracilis and var. deludens (Beck) A. Pujadas) from Northern and Southern Spain growing on different hosts was analysed using RAPD markers. The diversity analysis within populations revealed a higher level of diversity in the populations from the North when compared to the Southern ones. The results of principal co-ordinate analysis (PCoA) based on Dice distances among samples clearly established the separation of samples according to the taxonomical variety and the geographical origin of each population. The Southern populations of both var. gracilis and var. deludens were more differentiated among them than those of var. gracilis from the North. The analysis of...
Tipo: Journal article Palavras-chave: AMOVA; Molecular markers; Orobanche gracilis; Parasitic plants; Population genetics.
Ano: 2007 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000200006
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Liana loads and their association with Bertholletia excelsa fruit and nut production, diameter growth and crown attributes. Repositório Alice
KAINER, K. A.; WADT, L. H. de O.; GOMES-SILVA, D. A. P.; CAPANU, M..
We investigated the association between lianas and Bertholletia excelsa (Brazil nut), along-lived, emergent tree of significant ecological and economic importance in Amazonia. Our objectives were: (1) to determine the relationship between crown liana load and liana number, basal area, and origin in relation to the B. excelsa host; and (2) to determine the relationship between liana load and B. excelsa fruit and nut production, diameter growth, and crown form, position and area. One hundred and forty trees (>50 cm dbh) were selected with representatives of 10 diameter classes and four liana load categories. To quantify fruit and nut production, fruit counts and nut fresh weights per tree were measured in 2002 and 2003, and annual diameter growth was...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Castanha do brasil; Liana; Castanha do pará; Bertholletia excelsa; Erva daninha; Competição biológica; Brazil nuts; Parasitic plants; Weeds; Lianas; Ecological competition; Nuez del Brasil; Plantas parásitas; Malezas; Competencia ecológica.
Ano: 2006 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1036958
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Reforma de pastagens com alta infestação de capim-navalha (Paspalum virgatum). Infoteca-e
ANDRADE, C. M. S. de; FONTES, J. R. A.; OLIVEIRA, T. K. de; FARINATTI, L. H. E..
Nesta publicação, descreve-se um método de reforma de pastagens degradadas com alta infestação de capim-navalha, associando o uso de herbicida pré-emergente com o plantio consorciado de gramíneas forrageiras com o milho. Inicialmente, será feita uma descrição dos aspectos biológicos do capim-navalha, das características do herbicida pré-emergente atrazina e dos sistemas de integração lavoura-pecuária. Posteriormente, serão apresentadas as principais etapas do método proposto, incluindo os coeficientes técnicos e os resultados da validação realizada em Rio Branco, AC.
Tipo: Circular Técnica (INFOTECA-E) Palavras-chave: Capim Navalha; Paspalum virgatum; Pasture recovery; Recuperación de pastizales; Herbicida pré-emergente; Rio Branco (AC); Acre; Amazônia Ocidental; Western Amazon; Amazonia Occidental; Pastagem; Rendimento; Erva daninha; Gramínea; Capim; Herbicida; Pastures; Crop yield; Parasitic plants; Grass weeds; Preemergent weed control; Pastizales; Redimiento de los cultivos; Plantas parásitas; Malezas herbáceas; Escarda preemergente.
Ano: 2012 URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/948671
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Two mistletoes are too many?: Interspecific occurrence of mistletoes on the same host tree Acta Botanica
Arruda,Rafael; Lunardelli,Caroline; Kitagawa,Clóvis; Caires,Claudenir Simões; Teodoro,Grazielle Sales; Mourão,Fabiana Alves.
Mistletoe can have a major impact on the fitness of the host plant. If there is more than one species of mistletoe on the same host tree, the overall impact might be amplified. We report the occurrence of more than one species of mistletoe on the same host tree. Although it is not a rule in the field, to our knowledge, there have been no studies of this topic. In most cases, two species of mistletoe were recorded on the same host tree, although we recorded three species of mistletoe on one occasion. This demonstrates that different species of mistletoe can be compatible with the same host species. Therefore, compatibility (structural and physiological) might be an important factor for the occurrence of mistletoe. Recent studies have shown that if the...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Parasite-host relationship; Compatibility; Specificity; Parasitic plants; Red Queen hypothesis.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000100021
Registros recuperados: 5
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