Resumo

HERNANDEZ-LOPEZ, Jesahbel; TOVAR-SOTO, Alejandro; CARVAJAL-SANDOVAL, Alicia  e  TORRES-CORONEL, Rolando. ALTERACIONES ANATÓMICAS INDUCIDAS POR CACTODERA GALINSOGAE (NEMATA: HETERODERINAE) EN MIEMBROS DE ASTERACEAE. Polibotánica [online]. 2006, n.22, pp.1-8. ISSN 1405-2768.

We investigated the anatomical changes induced by the cyst-forming nematode Cactodera galinsogae in the weeds Galinsoga parviflora and Bidens odorata, both members of the Asteraceae, growing in a naturally infested field of barley at ‘‘La Raya’’, Singuilucan, Hidalgo. During the2003 growing season, the weeds were collected at 15, 30 and 45 days after emergence. Their roots were washed and fixed in Craf in the field. Part of the material was stained with fuchsin-lactoglycerol and cleared with clove oil; the other part was embedded in paraffin for making slices with the microtome and stained with fuchsin-fast green. Cactodera galinsogae-induced feeding sites (sincitia of irregular form) were located mainly in the vascular cylinder and cortex. The main changes at the cellular level were: cells around the feeding sites underwent hyperplasia, cytoplasm of the sincitia became dense and granular, cortical cells thickened and ruptured where the nematodes penetrated, and a suber layer formed around the mature females located in the cortex. Furthermore, the xylem vessels of the vascular cylinder were disorganized, and magenta crystals of unknown nature were observed in the cortex. Inside the stained roots, juveniles (J2, J3, J4) and mature females of C. galinsogae were located in the cortex in a plane parallel to the vascular cylinder, mostly in secondary and tertiary roots.

Palavras-chave : cyst-forming nematode; Cactodera galinsogae; vascular cylinder; feeding site; hyperplasia; suber.

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