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MITOSIS IN THE NON‐ARTICULATED LATICIFER OF EUPHORBIA MARGINATA
Author(s) -
Mahlberg Paul G.,
Sabharwal Pritam S.
Publication year - 1967
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1967.tb10667.x
Subject(s) - mitosis , biology , metaphase , meristem , hypocotyl , botany , microbiology and biotechnology , chromosome , genetics , shoot , gene
The multinucleate condition in the non‐articulated laticifers of embryos of Euphorbia marginata arises as a result of mitosis. Successive stages of mitosis in the nuclei of the laticifer appear in the form of a wave. No sequence of mitotic stages has been noticed in the neighboring longitudinal tiers of cells. This difference in the mitotic pattern in the laticifer and other parenchymatous cells of the embryo suggests that the synthesis of factor(s) responsible for triggering mitosis occurs within the laticifer and does not diffuse to the surrounding cells. The mitotic waves originate distally from the meristems, either in the cotyledonary or hypocotyl portion of the laticifer, and move uni‐ or bidirectionally along its longitudinal axis. The mitotic stimulus does not start simultaneously in all the laticifers. The variable velocity of the mitotic substance results in aphasic mitotic waves in laticifers of the same embryo. Mitotic aberrations have not been observed in the dividing nuclei of the laticifer. A chromosome estimation made from a polar view of metaphase does not suggest polyploidization in the observed laticifers.