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Pathogenic variability and mycelial compatibility groups in Sclerotium rolfsii populations infecting sugar beet crops in Mediterranean climate-type environments

AutorRemesal, Efrén ; Jordán-Ramírez, Rafael ; Jiménez-Díaz, Rafael M. ; Navas Cortés, Juan Antonio
Fecha de publicaciónabr-2011
EditorInternational Organisation for Biological and Integrated Control of Noxious Animals and Plants
CitaciónIOBC/WPRS Bulletin 71 (2011)
ResumenSugar beet is severely affected by Sclerotium root-rot caused by Sclerotium rolfsii in autumn sowings in Mediterranean-type climate areas. However, the inoculum density of the pathogen can be effectively reduced by rotating with slightly susceptible crops. In this study, we assessed the occurrence of mycelia compatibility groups (MCGs) among 459 S. rolfsii isolates infecting autumn sown sugar beet in Spain, Portugal, Chile, and Italy, and their pathogenic diversity to 11 economically important hosts crops for those regions. Twelve MCGs were identified. MCG iii (18.9% of isolates) was the most prevalent being identified in all countries except Italy. MCG i was the most abundant (64.7% of isolates) but was present only in the Iberian Peninsula. The remaining ten MCGs were identified in various regions at different countries (v) or regions within a country (ii, vi, and ix), restricted to specific localities (viii, xi, and xii), or were singleisolates member groups (iv, vii, and x). Individual fields contained one to three MCGs. A high pathogenic variability among MCGs representative isolates as well as on the level of susceptibility among the tested host plant species was found, but with no MCG - host species significant interaction. MCGs vi and ii were highly virulent, MCGs i, iii, ix, and x moderately virulent, and MCGs iv, v, vii, viii, xi, and xii low virulent. There was a high degree of homogeneity on disease severity induced by isolates within a given MCG. Among plant species, chickpea and sunflower were highly susceptible, pepper, watermelon, cotton, and tomato susceptible, and broccoli, sugar beet, and melon, moderately susceptible. Both monocotyledonous species (wheat and corn) were resistant being appropriate for rotation with susceptible crops. Sclerotium root-rot diseases can become an important threat for vegetable crop production established in infested areas by S. rolfsii where sugar beet production area has being drastically reduced.
DescripciónTrabajo presentado en el 6th meeting of the IOBC-WPRS Working Group Multitrophic Interactions in Soil, celebrado en Córdoba (España) del 4 al 7 de abril de 2011.
Identificadoresisbn: 978-92-9067-249-4
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