Cytochemical investigation of resistance to root-knot nematode Meloidogyne naasi in cereals and grasses using cryosections of roots

摘要: Summary - Some enzymes and plant constituents mobilized in the development of hypersensitive reactions were localized healthy infected roots rwo plants fully resistant to Meloidogyne naasi (the grass Aegilops variabilis, wild barley Hordeum chilense), as weil from susceptible wheat (Triticum aeslivum cv. Chinese Spring vulgare Doublet). Soon after infection, showed induced due increased peroxidase activity production free radicals. Acid phosphatase necrotic sites was detected disruption lyric vacuoles. Callose early A. whereas Iignin accumulated H. chilense. ln both cases, phenol oxidation an response nematodes, suberization found later cells contacting endodermis. The role these substances resistance graminaceous hosts is discussed. Resume Recherchesur la cytochinzie de au nenzatode a galle chez les cereales et granzineessauvages- La localisation histologique certaines constituants vegetaux generalement mobilises dans d'hypersensibilite ete etudiee sur du materiel sain infeste provenant deux plantes totalement resistantes iVfeloidogyne -les graminees sauvages variabilis chilense ainsi que sensibles Triticum aestivum Doublet. Chez resistantes, contrairement aux sensibles, certains changements sont observes peu temps apres ['infestation: activite radicaux libres accrues reaction induite. Dans jours suivants, rupture des vacuoles lyriques, une acide decelee cellules necrotiques. un depot rapide callose parois contact nematodes intervient alors on assiste accumulation lignine. cas, oxydation precoce phenols se produit hypersensibles qu'une suberisation tardive l'endoderme. Le ces est discute.