Pathogenicity and histopathology of Meloidogyne javanica and Meloidogyne incognita on olive and tomato [Root-knot nematodes; quantitative relationship between certain cellular responses and the nematode reproduction potential; Nabali, Grosa de Spain; Claudia Raf; Jordan].
1986
Atieh S.A.L.
The pathogenicity and histopathology of the root-knot nematodes Meloidogyne iavanica and Meloidogyne incognita on olive and tomato grown in 15 cm pots under green house conditions were studied. The olive cultivars were Nabali and Grosa de Spain inoculated with 5000 eggs of each nematode species six times; tomato cultivar Claudia Raf experiment treatments comprised inoculation with 5500 eggs of each nematode species three times. In the olive and tomato treatments were replicated eight times as each experiment was arranged in completely randomized design. The results indicated that olive cv. was parasitized by both nematode species, but Meloidogyne incognita reduced the weight of tops of the olive cv. The two nematode species induced considerable gall formation and eggmass production on roots of the two cultivars. The two nematodes reproduce much better on tomato than on olive and the number of eggs/eggmass was higher on tomato than on olive, especially more on Grosa de Spain than on Nabali, as Meloidogyne incognita produced more eggs per eggmass than Meloidogyne javanica. Histopathological studies showed that the number of giant cells, nuclei and nucleoli were significantly more in tomato than in olive roots. The average section area per giant cell, total area of grouped giant cells and total area of nuclei were highly correlated to the number of eggs/eggmass. The section area of the grouped giant cells was the major factor, whereby the regression test has indicated that the average section area of grouped giant cells determines 94% of the number of eggs/eggmass.
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