Bipolar Heterothallism, a Principal Mating System of Cordyceps militaris In Vitro

  • Shrestha Bhushan (Department of Applied Biology, Kangwon National University) ;
  • Kim Ho Kyung (Mushtech Co. Ltd) ;
  • Sung Gi Ho (Department of Botany and Plant Pathology, Oregon State University) ;
  • Spatafora Joseph W. (Department of Botany and Plant Pathology, Oregon State University) ;
  • Sung Jae Mo (Department of Applied Biology, Kangwon National University)
  • 발행 : 2004.11.01

초록

Interest in in vitro study of entomopathogenic fungi, including Cordyceps species, has been increasing due to their valuable bioactive compounds and biocontrol effects. Among Cordyceps species, in vitro stromata of C militaris has been successfully produced and cultivated for industrial purposes. However, genetic study on in vitro stromata formation of C militaris has not been carried out yet. Here, relationship between mating system and perithecial stromata formation of C militaris is reported. Mating system was determined by observing perithecial stromata formation from mono-ascospore cultures and their pair-wise combinations. Certain combinations of mono-ascospore strains produced perithecial club-shaped stromata, whereas other combinations produced either no stromata or only abnormal non-perithecial stromata. Similarly, mono­ascospore cultures without combination produced either no stromata or only abnormal non­perithecial stromata. Despite obvious heterothallism, self-fertility was occasionally observed in few strains of C militaris. These observations indicated that C militaris behaves as a bipolar het­erothallic fungus and requires two mating compatible strains in order to produce regular club­shaped perithecial stromata, a fundamental requirement for its industrial cultivation.

키워드

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