SciELO - Scientific Electronic Library Online

 
vol.5 issue22Endangered vegetal species, their distribution and conservation status of the ecosystems in which they occur author indexsubject indexsearch form
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

  • Have no similar articlesSimilars in SciELO

Share


Revista mexicana de ciencias forestales

Print version ISSN 2007-1132

Abstract

CIBRIAN TOVAR, David et al. Swiss needle cast (Phaeocryptopus gaeumannii (Rhode) Petrak) in Pseudotsuga menziesii var. glauca (Beissn.) Mayr. Rev. mex. de cienc. forestales [online]. 2014, vol.5, n.22, pp.104-118. ISSN 2007-1132.

There are native populations of Phaeocryptopus gaeumannii in Mexico as colonizing species of Pseudotsuga menziesii var. glauca. This fungus is the cause of the Swiss Needle Cast, a disease that provokes premature defoliation and a reduction in growth. The aims of the this paper were to identify and describe molecularly this pathogen in different geographical areas and to clear up some details of its biological cycle. Therefore, P. menziesii var. glauca leaves with ripe pseudothecia were collected in eight states of the country and a sample from Oregon (United States of America) was taken; they were isolated in 1.5 % water-agar (WA) and were kept in a potatoe - dextrose - agar (PDA) cultivation media for 60 days. To identify them, morphological features were considered as well as the results of the nuclear gene amplification, through the ITS - PCR which showed 99 to 100 % of identity. Growth was radial, olive green to grey color, without formation of reproductie structures. P. gaeumannii is found in the natural forests of Sierra Madre Occidental, Sierra Madre Oriental and Sierra Madre del Sur, as in several Christmas tree plantations at central Mexico. Ascospores became ripe in March and are visible in the atmosphere; the main dispersion occurrs from June and July; in regard to the climate and the locality; in September and October they diminish their amount.

Keywords : Christmas trees; spore catchment; PCR; commercial plantation; Phaeocryptopus gaeumannii (Rohde) Petrak; pseudothecius.

        · abstract in Spanish     · text in Spanish     · Spanish ( pdf )

 

Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License