Fitopatologia Brasileira (2006) 31, 297-301

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Aloísio Sartorato, Kátia L. Nechet and Bernardo A. Halfeld-Vieira (2006)
Diversidade genética de isolados de Rhizoctonia solani coletados em feijão-caupi no Estado de Roraima
[Genetic diversity of Rhizoctonia solani isolates collected from cowpea in the State of Roraima]
Fitopatologia Brasileira 31 (3), 297-301
Abstract: Cowpea (Vigna unguiculata) is one of the most important sources of protein for people with low incomes in Northern and Northeastern Brazil. Cowpea is susceptible to several diseases, including web blight caused by the fungus Rhizoctonia solani (teleomorph Thanatephorus cucumeris). Although R. solani is a very important disease agent, in Brazil there is no information on isolate characteristics when this fungus is associated with cowpea. The objective of this study was to evaluate, using Random Amplified Polymorphic DNA (RAPD) and RFLP-ITS (Internal Transcribed Spacer) techniques, the genetic diversity of R. solani isolates collected in the State of Roraima from cowpea cultivated under 'savannah' and 'forest' ecosystems. From the results it was possible to demonstrate genetic diversity among R. solani isolates and to prove that both molecular techniques used were efficient in evaluating it.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Portuguese)
Full text of article
Database assignments for author(s): Bernardo de Almeida Halfeld-Vieira

Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution
molecular biology - genes

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Rhizoctonia solani Cowpea and relatives (Vigna) Brazil (NW)