كليدواژه :
Fusarium spp , Foot and Root , faba bean , طوقه و ريشه , Rot , فوراريومها , باقلا , پوسيدگي
چكيده لاتين :
During growing seasons of 2001-2002 this study was conducted to investigate and determine the Fusarium spp. associated with foot and root of faba bean in Khuzestan. Samples were collected from infected plants from different fields in different regions of Khuzestan including Ahwaz, Hamidie, Behbahan, Aghili, Shooshtar, Dezful, Sefiabad, Shoosh and Andimeshk. Eighty four isolates of the Fusarium species were isolated and purified by single spore or hyphal tip methods. Based on morphology, the isolates were identified as: F. oxysporum (27 isolates, 32.14%), F. solani (23 isolates, 27.38%), F. moniliforme (18 isolates, 21.42%), F. proliferatum (8 isolates, 9.52%), F. semitectum (4 isolates, 4.76%), and F. equiseti (4 isolates, 4.76%). This is the first report on these species from vicia faba from Iran. Besides, Faba bean is reported to be a Matrix nova for F.proliferatum, F. semitectum and F. equiseti. In pathogenicity tests, seedlings were inoculated using different methods including dipping roots in a spore suspension with 106CFU/ml, adding spore suspension to the soil around the roots, and using inoculated wheat grains (with the fungal isolates) in the soil around the seedling roots. Results indicated that all the isolates were pathogenic to the broad bean plants. In all pathogenicity methods mentioned above, F. solani had the most virulent.
