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Nuclear behavior and division in germinating conidia of botrytis cinerea



Nuclear behavior and division in germinating conidia of botrytis cinerea



Phytopathology 78(12 Part 2): 1627-1630



Light-microscopic observations were carried out on resting and dividing nuclei in germlings of Botrytis cinerea incubated in potato-dextrose broth at 22.degree. C in darkness. The conidia contained various numbers of nuclei, commonly up to 10. Nuclei in each cell were divided synchronously by mitosis. The time elapse between the initiation of nuclear division and septum formation was approximately 2 hr. The cell cycle of the fungus was about 2.7 hr. Nuceli appeared to migrate through the septal pore and aggregated in the area of the appressorium. The growing tips of many germlings collapsed after treatment with methanol-acetic acid solution, releasing chromosomes at metaphase. The number of chromosomes counted in many burst germlings was 16. The length of each chromosome at metaphase ranged from 0.6 to 1.3 .mu.m and the width was 0.2-0.3 .mu.m; total length of the component was 13.1 .mu.m. One of the chromosomes had an additional threadlike structure.

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