Abstract
Eighteen isolates ofFusarium vasinfectum Atk., from different parts of the world,viz., India, Italy, the U.S.A. and the U.S.S.R. were compared for their morphological and cultural characters, and found to be different. Light induced the formation of a uniform orange pigmentation in the cultures regardless of their being pigmented or not under dark-incubation and this is possibly due to photoactivation. The isolates maintained the observed morphological characters over a period of two years, when grown on standard medium, incubated at constant temperature and under darkness, though subcultured repeatedly.
The isolates could be differentiated into three groups on the basis of their pathogenicity to two cotton speciesGossypium arboreum L. andG. hirsutum L. The Indian and Russian isolates were pathogenic toG. arboreum while the American and the Italian, toG. hirsutum. Four of the Indian isolates were, however, pathogenic to neither of the hosts. The wilt symptoms were different on the two hosts. The roots of the host plants were invaded by all the isolates under the present experimental conditions. There was no correlation between wilt percentage and percentage of roots invaded. The pathogenic potential of the isolates is, hence, not related to their ability to invade the host roots.
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Communicated by Prof. Dr. T. S. Sadasivan, F.A.Sc.
Memoir No. 64 from the Centre for Advanced Study in Botany.
Part of the thesis of the author approved for the degree of Doctor of Philosophy by the University of Madras, 1967.
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Charudattan, R. Studies on strains ofFusarium vasinfectum Atk.. Proc. Indian Acad. Sci. 70, 139–156 (1969). https://doi.org/10.1007/BF03052223
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DOI: https://doi.org/10.1007/BF03052223