Electron microscopy of primary zoosporogenesis inPlasmodiophora brassicae |
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Authors: | Shuhei Tanaka Shin-ichi Ito Mitsuro Kameya-Iwaki |
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Institution: | (1) Department of Biological and Environmental Sciences, Faculty of Agriculture, Yamaguchi University, 753-8515 Yoshida, Yamaguchi, Japan |
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Abstract: | Primary zoosporogenesis in resting sporangia ofPlasmodiophora brassicae that had been incubated for 14 d in culture solution containing turnip seedlings was examined by transmission electron microscopy.
A single zoospore differentiated within each sporangium, the differentiation being initiated by the emergence, of two flagella
in the tight space formed by invagination of the plasma membrane within the sporangium. The differentiazing zoospore was similar
in intracellular aspects to sporangia within clubroot galls. Then a deep groove formed on the zoospore cell body by further
invagination of the plasma membrane. Two flagella appeared to coil around the zoospore cell body in parallel along this groove.
Thereafter, the cell body lost the groove and became rounded following the protoplasmic condensation (contraction of cell
body) during late development, and assumed an irregular shape at the stage of maturation. Intracellular features in, developing
and mature zoospores were complicated, being characterized by electron-dense nuclei and mitochondria, microbodies, cored vesicles
and various unidentified cytoplasmic vesicles and granules. A nucleolus-like region was observed only in the nucleus of the
mature zoospore. A partially opened germ, pore was also seem in the sporangium containing the mature zoospore. |
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Keywords: | fine structure germ-pore Plasmodiophora brassicae primary zoospore zoosporogenesis |
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