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Abnormal Mitosis in Seedlings of some Gramineae Following Seed Treatment

J. E. Sass
American Journal of Botany
Vol. 25, No. 8 (Oct., 1938), pp. 624-627
Stable URL: http://www.jstor.org/stable/2436523
Page Count: 4
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Abnormal Mitosis in Seedlings of some Gramineae Following Seed Treatment
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Abstract

Ethyl mercury phosphate induces hypertrophy and abnormal mitosis in meristematic cells of seedlings of corn and several small grains. The toxic agent is absorbed by sprouting kernels and by the root tips of seedlings. The abnormality is produced in axillary bud primordia and other meristematic cells remote from the region of absorption. Nuclear division is characterized by the formation of multipolar spindles, irregular or incomplete anaphase separation of split chromosomes, and by the failure of plate formation. Irregular multipolar separation produces multinucleate cells. The nuclei of a given cell may be approximately equal in size and chromosome number or they may be very unequal. Total failure of anaphase separation produces giant, polyploid restitution nuclei. Cell plate formation may be initiated, but such plates are apparently evanescent.

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