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versión On-line ISSN 2521-9766versión impresa ISSN 1405-3195

Agrociencia vol.41 no.5 México jul./ago. 2007


Plant Protection

Anatomical changes on barley roots (Hordeum vulgare L.) induced by cactodera galinsogae

Alejandro Tovar-Soto1 

Ignacio Cid del Prado-Vera2 

Julie Margaret-Nicol3 

Kenneth Evans4 

José S. Sandoval-Islas2 

Angel Martínez-Garza 

Elizabeth Cárdenas-Soriano2 

1 Departamento de Parasitología. ENCB-IPN.

2 Fitopatología. Campus Montecillo. Colegio de Postgraduados. 56230. Montecillo, Estado de México.

3 International Wheat and Maize Improvement Centre (CIMMYT), P.O. Box 39, Emek, 06571, Ankara, Turkey.

4 Nematode Interactions Unit, Rothamsted Research, Harpenden, Herts, AL52JQ, U.K.


The anatomical changes in barley (Hordeum vulgare L.) cv. Esmeralda roots caused by C. galinsogae, collected at 10, 20, and 40 days after plant emergence at Singuilucan, Hidalgo are described. It is a recently described pathogen, whose lessions induced on the host plant are unknown. The histological exam showed the 10-day-old juveniles (J2, J3) in the cortical tissue, breaking of neighbouring cells being observed. At 20 d, the juveniles (J3, J4) were found close to the vascular cylinder. Furthermore, the induction of lateral primordia near the nematode was observed. The feeding sites, small and irregular, covered less than 50% of the vascular cylinder and the cortical tissue, with dissolution of internal, and thickening of external cell walls and with disorganization, displacement, and breaking of xylem and phloem. At 40 d, in the cross sections, syncytia were larger, covering 50 to 60% of the vascular cylinder. At cell level, the changes were similar to those observed at 20 d, besides starch being present in abundance. Mature females were observed in the cortex, surrounded by a layer of cork cambium, and the males appeared bent in the same tissue.

Key words: Anatomical changes; México; cyst-forming nematode; poaceae

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Received: March 2006; Accepted: May 2007

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