Abstract
The organization and distribution of microfilaments in freze substituted leaf tissues and root tips of tobacco plants (Nicotiana tabacum L. var. Maryland Mammoth) were investigated in detail. Three categories of microfilaments were recognized in interphase cells of all tissues including those in the root cap: (1) microfilament bundles; (2) single microfilaments; (3) cortical microtubuleassociated microfilaments. While the microfilament bundles appeared to be distributed throughout the cytoplasm, the single microfilaments were mainly confined to the cell periphery. All three categories of microfilaments were associated with various organelles. Our study indicates that the three categories of microfilaments are normal cytoskeletal components in higher plant cells. The implications of these findings are discussed.
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