Abstract

All potato cultivars are susceptible to root-knot nematodes (Meloidogyne spp.) which infest the roots and inducegalls on the surface and necrotic spots in the flesh tuber of potato, Solanum tuberosum. Infested tubers areunacceptable for processing and fresh market. Tubers are also putative source of dissemination of the nematode. AFrench nematode- resistant tetraploid potato genotype gained from ex-S. sparsipilum material hybridized with S.tuberosum in F1 and in their back cross progenies and designated as 02T.155.6 was tested and compared in thepresent study in Egypt as a suitable different environment. Histopathological changes and chitinase activity inducedby M. incognita population, of common occurrence in Egypt, in four French tetraploid materials and two commoncultivars known as nematode- resistant and susceptible potato genotypes were investigated. Hypertrophied cellswere initiated in both cortical and steler regions of the roots which were then developed to abnormal xylemelements expanding into the cortex in French susceptible genotypes designated as 02T.149.6, 02T.150.54, and02T.157.16. Nematode within the vascular tissue (stele) could induce giant cell development close to nematodeheads. The largest number of such induced cells was shown by the cultivars Spunta and Diamant. The clone02T.155.6 with putative nematode resistance demonstrated none or very little nematode development. Recentlydead second stage juveniles could also indicate incompatible plant reaction to the invading nematodes in02T.155.6. M. incognita, Giza population, resistance was generally more coherent to 02T.155.6 as demonstrated byour histological investigations but less coherent as shown by another Egyptian M. incognita population. Chitinaseactivity was enhanced in M. incognita (Giza)-inoculated with respect to uninoculated roots in all plants. Afterinoculation, such an activity generally increased more in roots of a potato genotype previously known to haveresistance or relatively low numbers of both nematode galls and eggmasses than in the other tested cultivars.Peroxidase and catalase activities of nematode- inoculated with respect to uninoculated potato roots werepresented and discussed.

Autore Pugliese

• Molinari Sergio

Tutti gli autori

• Abd-Elgawad M.M.; Kerlan M.C.; Molinari S.; Abd-El-Kareem F.; Kabeil S.S.A.;Mohamad M.M.; El-Nagdi w.A.

Titolo volume/Rivista

eSci Journal of Plant Pathology

Anno di pubblicazione

2012

ISSN

2306-1650

ISBN

Non Disponibile

Numero di citazioni Wos

Nessuna citazione

Ultimo Aggiornamento Citazioni

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Numero di citazioni Scopus

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Ultimo Aggiornamento Citazioni

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Settori ERC

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Codici ASJC

Non Disponibile