Fungi associated with root tissue infected by Phymatotrichum omnivorum

Authors

  • Gerardo Pérez Campo Agrícola Experimental de La Laguna. CIFAP-INIFAP-SARH. Matamoros, Coahuila, México
  • Teodoro Herrera Campo Agrícola Experimental de La Laguna. CIFAP-INIFAP-SARH. Matamoros, Coahuila, México
  • José A. Samaniego Campo Agrícola Experimental de La Laguna. CIFAP-INIFAP-SARH. Matamoros, Coahuila, México

DOI:

https://doi.org/10.33885/sf.1992.3.789

Abstract

The fungal population in pecan roots, attacked by
Phymatotrichum omnivorum, which were obtained from 0-30, 31-60,
61-90, and 91-120 em depths in the soil was monitored by
culturing root tissue segments in potato-dextrose-agar and
cornmeal-agar. Root segments were washed in running water for
24 h and debarked to expose the discolored areas infected by the
pathogens; pieces of root tissue of 0.5 em in lenght were
obtained from the central area, the area between the center and
the margin, from the marginal area of discolored root tissue, and
from the proximal apparently healthy (white) root tissues outside
the discolored areas. These root tissue segments were surface
sterilized and plated in both media for recuperating and
identifying the fungi. Ph. omnivorum was not recovered from any
tissue related to the different lesion positions. But nine genera
of fungi were recovered, with no difference in frequency of total
colonies related either to depth or position from which the roots
were obtained. Gliocladium roseum, Fusarium spp. and Penicillium
spp. were the fungi isolated in the highest frequency. The
frequency of G. roseum and Fusarium spp. colonies isolated from
roots obtained at 0-60 em was higher (Chi square, p=O. 5) than
those obtained from 61-120 em, while Penicillium colonies were
isolated at the highest frequency from the lesions in roots
obtained from 91-120 em. No relationship was found among the
presence of G. roseum, Penicillium spp. and Fusarium spp.

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How to Cite

Pérez, G., Herrera, T., & Samaniego, J. A. (2016). Fungi associated with root tissue infected by Phymatotrichum omnivorum. Scientia Fungorum, 3(8), 71–84. https://doi.org/10.33885/sf.1992.3.789

Issue

No. 8 (1992): RMM núm. 8 1992

Section

Original papers

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