An evaluation of Fusarium oxysporum from crucifers based on pathogenicity, isozyme polymorphism, vegetative compatibility, and geographic origin

Citations Over TimeTop 11% of 1987 papers

Abstract

A global collection of 123 putative isolates of Fusarium oxysporum from crucifers was examined for pathogenicity, isozyme polymorphism, and vegetative compatibility. Of these isolates, 103 were found to be pathogenic on one or more of six differential crucifer cultivars. Three patterns of isozyme polymorphism (electrophoretic types) were found and by means of a nitrate reductase complementation test, three major vegetative compatibility groups were identified that could differentiate among the F. oxysporum pathotypes. Complete correspondence was found among pathotype, electrophoretic type, and vegetative compatibility. It seems appropriate to classify isolates from the Cruciferae into the subspecific taxa, F. oxysporum f.sp. conglutinans, F. oxysporum f.sp. raphani, and F. oxysporum f.sp. matthioli, based on their naturally infected host species, Brassica oleracea, Raphanus sativus, and Matthiola incana, and on estimates of genetic identity. Within formae speciales, races can be identified based on intraspecific host specialization. Geographic origin was not found to be associated with the vegetative compatibility, isozyme phenotype, or pathotype. Isozyme polymorphisms also differentiated among four F. oxysporum formae speciales from other host families and among various Fusarium species.

Related Papers

• → The Host-Parasite Interface of Albugo candida on Raphanus sativus(1964)35 cited
• → Sulfur‐ and Nitrogen‐containing Neutral Volatile Components of Cruciferae(1985)10 cited
• → Interaction between two aphid species on raya, Brassica juncea Coss.(1990)
• Genetic variability and relationships among mustard (Brassica juncea (L.) Czern. et Coss.) and radish (Raphanus sativus L.) germplasm from Pakistan(2007)
• Use of Raphano-Brassica for restoring fertility of cytoplasmic male sterility transferred from radish (Raphanus sativus L.) to rape (Brassica napus L.)(1985)