Person: Nicol, J.M.
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Nicol
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J.M.
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Nicol, J.M.
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- Los nematodos formadores de quistes en México(Sociedad Mexicana de Fitopatología, 2006) Tovar-Soto, A.; Cid del Prado-Vera, I.; Sandoval Islas, J.S.; Martinez-Garza, A.; Nicol, J.M.; Evans, K.
Publication - Cambios anatómicos en raíces de cebada (Hordeum vulgare L.) inducidos por Cactodera Galinsogae(Colegio de Postgraduados, 2007) Tovar-Soto, A.; Cid del Prado-Vera, I.; Nicol, J.M.; Evans, K.; Sandoval Islas, J.S.; Martinez-Garza, A.; Cárdenas Soriano, E.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.
Publication - Cactodera galinsogae N.Sp (Tylenchida: heteroderinae) on barley (Hordeum vulgare L.) of the high valleys of Mexico(Organization of Nematologists of Tropical America, 2003) Tovar-Soto, A.; Prado Vera, C. I. del; Nicol, J.M.; Evans, K.; Sandoval Islas, J.S.; Martinez-Garza, A.Cactodera galinsogae n. sp. (Heteroderinae) was isolated from dicotyledonous Galinsoga parviflora (Asteraceae) roots. It also reproduced on barley (Hordeum vulgare) and wild oats (Avena fatua) (Poaceae) and on other dicotyledonous weeds, notably Bidens odorata (Asteraceae). The samples were taken from a cultivated field of barley in the town of "La Raya", municipality of Singuilucan, Hidalgo, in the Central Valleys of Mexico. Cactodera galinsogae is characterized by the vulval cone of the females and the cysts are smaller than in most other species of this genus, with a straight neck, and the vulval cone with circumfenestra but without vulval denticles. The cysts are small (average length 523 µm), spherical or sub-spherical and light to dark brown with a straight neck, and with the transverse branching striae of the cuticle surface pattern of the midbody forming an interlaced pattern. The second stage juveniles have six pseudolips, and four lateral lines with incomplete areolation (non-areolated internal lines) on the side of the body. The eggs are retained in the females, although a gelatinous matrix (without eggs) is observed in some. The egg-shells, when observed under the scanning electron microscope, show a specific pattern of punctations. The males are cylindrical and small (average length 830 µm) compared to the other species of Cactodera. They adopt a 'C' shape when killed by heat, with 4-5 lip annuli on the irregular labial region. The excretory pore is located at the level of the esophageal gland lobe (distance from the anterior end to the excretory pore/L = 14.7%). The spicules are slightly curved and bifid.
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