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Title

INVESTIGATION ON GENETIC DIVERSITY IN POPULATION OF FUSARIUM PROLIFERATUM RECOVERED FROM SUGAR CANE IN KHUZESTAN USING VEGETATIVE COMPATIBILITY GROUPS AND THEIR RELATION WITH THE PATHOGENICITY OF THE ISOLATES

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 Start Page 133 | End Page 147

Abstract

 During the period of 2005-2006, 80 isolates of FUSARIUM proliferatum, one of the major casual agents of Knife-cut disease of SUGAR CANE in KHUZESTAN province, were recovered. All isolates were examined for their pathogenicity and vegetative compatibility groups (VCGs). Results revealed that all isolates were pathogenic on SUGAR CANE. For diversity studies, NIT MUTANTs were generated from all isolates using PDC containing 3 & 5% KCL03 and Czapeck medium containing 3% KCL03. Collectively, 497 NIT MUTANTs were generated. Phenotype of the MUTANTs were determined based on their growth on basal medium containing one of the following salts: sodium NITrate, sodium NITrite, hypoxanthin and ammonium tartrate as a sole NITrogen source. Among the generated NIT MUTANTs, 45.3%, 19.7% & 35% were NIT1, NIT3 & NITm respectively. No vegetative self-incompatibility was observed in the isolates. Complementation tests between NIT MUTANTs that were carried out on minimal medium revealed that the isolates belonged to 27 vegetative compatibility groups. No specific relation was found between VCGs & pathogenicity of the isolates. No specific relation was either found between VCGs & geographic origin of the isolates.

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