Juan Carlos Noa-Carrazana

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 The coat protein gene of the papaya ringspot virus was cloned and sequenced in three Mexican isolates (two from Veracruz, and one from Chiapas). The sequences of these viral isolates were compared to those of eleven isolates from other parts of the world. They had higher similarity to isolates from Australia and the United States than to Asian isolates. A(More)
The virus most often reported in papaya (Carica papaya L.) is papaya ringspot (PRSV). The aim of this work was the molecular genomic characterization of a Mexican severe isolate of PRSV-P “Mex-VrPO” (isolate from the State of Veracruz in Paso de Ovejas) as well as its comparison with other isolates from other world regions. The linear, assembled,(More)
The first bacterial artificial chromosome (BAC) library of the banana species Musa balbisiana 'Pisang Klutuk Wulung' (PKW BAC library) was constructed and characterized. One improved and one novel protocol for nuclei isolation were employed to overcome problems caused by high levels of polyphenols and polysaccharides present in leaf tissues. The use of flow(More)
Sugarcane mosaic virus (SCMV) is an important pathogen of sugarcane (Saccharum interspecific hybrids) and maize (Zea mays) worldwide, causing significant yield losses in susceptible varieties [1]. SCMV is recognized as a member of a subgroup containing four distinct potyvirus species: Sugarcane mosaic virus (SCMV), Maize dwarf mosaic virus (MDMV),(More)
We studied the arbuscular mycorrhizal fungi (AMF) and dark septate fungi (DSF) in two lycopods and 23 ferns species collected from the tropical montane cloud forest in central Veracruz, Mexico. This is the first report of the mycorrhizal status for 17 species. Arbuscular mycorrhizal fungi were present in 11 species (44 %) which characterized by arbuscules(More)
Ethanolic extracts from Magnolia dealbata (Zucc.) (Magnoliaceae); leaves, bark, seeds, sarcotesta and flowers were evaluated for insecticidal activity against adults of the Mexican fruit fly, Anastrepha ludens (Loew) (Diptera: Tephritidae). Using feeding bioassays composed from sugar-extract mixtures, only the extract from sarcotesta indicated insecticidal(More)
Antagonism between unrelated plant viruses has not been thoroughly described. Our studies show that two unrelated viruses, papaya ringspot virus (PRSV) and papaya mosaic virus (PapMV) produce different symptomatic outcomes during mixed infection depending on the inoculation order. Synergism occurs in plants infected first with PRSV or in plants infected(More)
Alsophila firma is a deciduous tree fern considered as an emblematic species of Mexican tropical montane cloud forest (TMCF). We studied spores diversity, structure and colonization by arbuscular mycorrhizal fungi (AMF) within the roots of the Alsophila firma in rainy and dry season. Eighteen species of the genera Acaulospora (5), Gigaspora (4), Glomus (4),(More)
Alsophila firma is a tree fern that is distributed mainly in tropical montane cloud forest (TMCF) and is considered as a threatened species. Arbuscular mycorrrhizal fungi (AMF) have been proposed as an alternative in rescue programs of endangered species. However, our knowledge about diversity of AMF and mycorrhizal status of the species of TMCF is limited.(More)
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