Morphological and physiological variation of Fusarium oxysporum f. sp. ciceri isolates causing wilt disease in chickpea

Morphological and physiological variation of Fusarium oxysporum f. sp. ciceri isolates causing wilt disease in chickpea



N. Nath, A. U. Ahmed, F. M. Aminuzzaman



Nine isolates of Fusarium oxysporum f. sp. ciceri
infecting chickpea were collected from major chickpea growing areas of
Bangladesh and their cultural, morphological, physiological and
pathogenic characteristics were described. The isolates varied
significantly in their cultural, morphological and physiological traits,
i.e. colony color, shape, margin and texture; mycelial radial growth
and spore production. Laboratory studies were conducted to study the
effect of different culture media, pH and temperature levels on mycelial
growth and sporulation of Fusarium oxysporum f. sp. ciceri. Mycelial
radial growth and sporulation of F. oxysporum was maximum for all the
isolates at 25°C after seven days of inoculation, which was reduced
drastically below 15°C and above 35°C. No growth and sporulation was
observed at 5 °C temperature for all the isolates. The most suitable pH
level for growth and sporulation of the fungus was at pH 6.0. The fungus
grew well on oat meal agar medium among seven culture media tested. No
sporulation was observed on WA medium. The highest number of macro
spores (3.27 x 105 ml-1) and micro spores (4.06 x 105 ml-1) were
produced on PDA. Among the nine tested isolates, only one isolate
(FOC-1) found to be highly virulent (HV) type on reaction on chickpea
variety BARI Chola –1. 



10.22161/ijeab/2.1.25



http://ijeab.com/upload_document/issue_files/25%20IJEAB-JAN-2017-9-Morphological%20and%20physiological%20variation%20of%20Fusarium%20oxysporum%20f.%20sp.%20ciceri%20isolates.pdf



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