Anatomical and histological alterations induced by Hemicycliophora poranga Monteiro & Lordello, 1978 in celery (Apium graveolens L.) roots.

CHALLIER, E.; OGGERO, A.; TORDABLE, M. DEL C.; LAX, P.; TANDINGAN DE LEY, I.; DOUCET, M.E

RUSSIAN JOURNAL OF NEMATOLOGY

MYLNEFIELD RESEARCH SERVICES

Año: 2011 vol. 19 p. 75 - 81

0869-6918

Celery (Apium graveolens L.) is an intensive horticultural crop. In Argentina, it is grown in several localities of the provinces of Buenos Aires, Santa Fe, Mendoza, and San Juan. A population of Hemicycliophora poranga has been recently detected infesting celery roots, which showed particular swellings and proliferation of lateral rootlets. Tissues were analyzed to describe anatomical and histological alterations caused by the parasite. Infected roots had simple and compound galls containing specimens of the nematode. Simple galls exhibited cellular hyperplasia that affected the pericycle, producing lateral root primordia that were contained within the cortical parenchyma; and galls were almost entirely composed of meristematic tissue or poorly differentiated cells of the new lateral roots. Compound galls exhibited similar histological alterations to those of simple ones, but showed a higher amount of lateral roots. The central body of compound galls was occupied by differentiated tissues. Hemicycliophora poranga-induced modifications in celery are related to an important proliferation of lateral roots.