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Your search keyword '"López, M. V."' showing total 2 results
Start Over Author "López, M. V." Topic fungi
2 results on '"López, M. V."'

1. Mycobiota from Cyclamen persicum and its interaction with Botrytis cinerea.

Author

Rivera MC, López MV, and Lopez SE

Subjects
Fungi classification, Phylogeny, Botrytis physiology, Cyclamen microbiology, Fungi isolation & purification, Fungi physiology
Abstract

Sixty-six fungi isolated from cyclamen phylloplanes were identified and assessed in vitro for antagonism to B. cinerea on leaves, petals, petioles and peduncles. The estimation of pathogen conidial production was used as indicator of biocontrol ability of each of the strains. They were classified by cluster analysis resulting in four categories according to their behavior in the different organs. The most promising category included 34 isolates that significantly reduced pathogen inoculum in all the organs. Correspondence analysis showed association among leaf isolations, strains of Clonostachys rosea and Penicillium spp. and the best biocontrol performance. The statistical analysis was successful in dealing with this complex set of experimental data. Leaf fungal diversity was higher than those of petals and petiols, with Shannon values of 2.7, 0.9 and 0.5 respectively. Evidence for antibiosis and hyperparasitism was found for C. rosea.

Published
2009
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2. Phytophthora nicotianae causando podridão de raiz e caule em Dieffenbachia picta em Buenos Aires, Argentina

Author

Palmucci, H. E., Grijalba, P. E., Wolcan, S. M., Guillin, E., López, M. V., Herrera, C., and Fantino, E.

Subjects
CAMILLA, DIEFFENBACHIA, DIEFFENBACHIA SEGUINE, OOMYCETES, fungi, food and beverages, SUSCEPTIBILITY, PHYTOPHTHORA, ORNAMENTALS, PERONOSPOROMYCETES, PHYTOPHTHORA NICOTIANAE
Abstract

327-331 Dieffenbachia picta is a worldwide appreciated crop due to its ornamental value. In Argentina it is cultivated in warm provinces and in the outskirts of Buenos Aires city, where in spring 2007 a great amount of plants were lost in commercial greenhouses. Symptoms such as wilting and soaked lesions in the basal leaves began in four- to six-month-old plants causing plants to wilt due to basal stem and root rot processes. A Peronosporomycete was consistently isolated from diseased tissues. The pathogen was identified as Phytophthora nicotianae based on cultural characteristics, morphology of vegetative and reproductive structures, and on the analysis of the sequence of the nuclear ribosomal internal transcribed spacer (ITS) region. Pathogenicity tests were carried out and Koch's postulates were fulfilled. In complementary studies, the dieffenbachia varieties Alex, Compact, Camilla and Marianne were susceptible to the infection caused by P. nicotianae, whereas Tropic snow (D. amonea) was resistant. This is the first report of P. nicotianae causing stem and root rot of D. picta in Argentina and in the Americas.

Published
2011

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