Sistema de Información Científica Redalyc
Red de Revistas Científicas de América Latina y el Caribe, España y Portugal

redalyc.org redalyc.org
Podosphaera (sect. Sphaerotheca) xanthii (Castagne) U. Brawn y N. Shishkoff en Cucurbitáceas en el Norte de Sinaloa, México
Rubén Félix-Gastélum, Miguel Ángel Apodaca-Sánchez, María del Carmen Martínez-Valenzuela, Silvia Espinosa-Matias;
Revista Mexicana de Fitopatología 2005 23(2)
Resumen
Inglés Español
Powdery mildew is one of the most important diseases in cucurbits in northern Sinaloa, Mexico. Regional literature refers to Golovinomyces cichoracearum (formerly known as Erysiphe cichoracearum) as the causal agent of the disease, but there is no research done to support this statement. The objective of this work was to identify the causal agent of the disease. Sixty samples of cucurbits with symptoms of powdery mildew represented by several genotypes of squash, cucumber, watermelon, melon and bottle gourd (Lagenaria siceraria) were collected in the region from 2000 to 2004. All samples presented simple conidiophores, with chains of 2-7 conidia and crenate margins. Conidia were primarily ovoid with fibrosin bodies and formed short and robust germ tubes; some forked germ tubes were also observed; turgid conidia under the scanning electron microscope displayed a smooth to slightly undulated outer wall, and the pattern of septa (end wall) exhibited slight concentric ridges; conidia partly collapsed produced predominantly longitudinal wrinkling, although transverse wrinkling was also observed. The sexual state was found only in squash and cucumber and consisted on spherical cleistothecia with septate myceliod appendages; each cleistothecium produced only one hyaline and ovoid ascus. The morphology and measurements of both asexual and sexual structures coincide with those of Podosphaera (sect. Sphaerotheca) xanthii (formerly known as Sphaerotheca fusca and S. fuliginea) reported in other cucurbit growing areas in the world. G. cichoracearum was not found in the samples collected during this study.

Palabras clave: Golovinomyces cichoracearum, powdery mildew, etiology, teleomorph, anamorph, conidia.
Ver Resumen
Universidad Autónoma del Estado de México
Sistema de Información Científica Redalyc ®
Versión 3.0 | 2018
redalyc@redalyc.org