In vivo growth and pathotoxin production by the maize pathogen Cochliobolus carbonum |
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| Institution: | 1. Departments of Obstetrics and Gynecology (Drs. Hirata, Koga, Fukuda, Neriishi, and Osuga);2. Surgical Oncology (Dr. Tanaka);3. Thoracic Surgery (Dr. Nakajima), University of Tokyo, Tokyo;4. Departments of Obstetrics and Gynecology (Dr. Kitade);5. Urology (Drs. Takazawa and Horie), Juntendo University, Tokyo;6. Department of Obstetrics and Gynecology, Tottori University, Tottori (Drs. Taniguchi and Harada);7. Department of Obstetrics and Gynecology, Kumamoto University, Kumamoto (Drs. Honda and Katabuchi);8. Pneumothorax Research Center and Division of Thoracic Surgery, Nissan Tamagawa Hospital, Tokyo (Dr. Kurihara);9. Department of Obstetrics and Gynecology, Kindai University, Higashiosaka (Dr. Nakai);10. Department of Obstetrics and Gynecology, Niigata University, Niigata (Dr. Enomoto);11. Department of Obstetrics and Gynecology, Kyoto University, Kyoto (Dr. Mandai);12. Department of Obstetrics and Gynecology, Oita University, Oita (Dr. Narahara);13. Department of Obstetrics and Gynecology, Kyoto Prefectural University, Kyoto (Dr. Kitawaki);14. Department of Plastic Surgery, Jichi Medical University, Shimotsuke (Dr. Yoshimura), Japan. |
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| Abstract: | Conidia of Cochliobolus carbonum secrete a toxin (HC-toxin) during appressorium formation on maize leaves. Plasma desorption mass spectrometry revealed that approximately 70 ng of toxin per 106 conidia were secreted during the first 16 h of morphogenesis. Growth of the fungus was monitored microscopically. Extensive fungal growth occurred in the susceptible interaction by 24 h. In spite of a substantial amount of HC-toxin, the fungus failed to become established in the resistant host even after 36 h. Results suggest that the resistance conditioned by Hm1, which encodes a toxin reductase, causes inactivation of the toxin early in the interaction. |
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