Contributions from the Department of Botany of Columbia University Volume 11, No. 270

Contributions from the Department of Botany of Columbia University Volume 11, No. 270

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1916 edition. Excerpt: amitosis and is related to sterility of pollen. He evidently regards it as abnormal, as he says that in the fertile pollen the division is "of the usual type." Cannon (10) in his paper on hybrid cotton shows quadripartition in figure 14. In figure 16 he shows division taking place between two nuclei by a broad cleavage furrow; no fibers or cell-plate are shown in the cytoplasm. Of the process he says, "Indentations appear in the periphery of the cytoplasm and midway between the nuclei, which deepen into constrictions, and finally accomplish the separation of the nuclei and the formation of the tetrads." He, however, does not discuss the existence of a cell-plate. The figure which best indicates quadripartition by cleavage furrows is that of Beer (5b) on Crepis; unfortunately this is unaccompanied by description. He reports quadripartition in Matricaria Chamomilla and Crepis taraxacifolia. Three figures of the latter and one of the former indicate this. In Crepis the mother-cell-wall is slightly thickened, and the nuclei are appressed to the plasma membrane before the cleavage furrow is well developed. No cell-plate is shown; but figures 57 and 58 show a constriction at different stages of development. The relation of the mother-wall to the furrow is not shown. Tahara (69) in his figure 9 shows that the mother-wall in Crepis is about one fourteenth of the diameter of the cell, just before quadripartition occurs. In Ipomoea Beer (5a) shows the mother-wall very much thickened after the homoeotypic division. He says that this wall gives a reaction to tests for callose and pectose, but does not discuss the cytokinesis. In Oenothera he says the mother-wall dissolves in 1 per cent NaOH only after about 24 hours. It is more

Product details

  • Paperback | 26 pages
  • 189 x 246 x 1mm | 68g
  • United States
  • English
  • black & white illustrations
  • 1236950070
  • 9781236950079