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Suspensor and Early Embryo of Pinus

Suspensor and Early Embryo of Pinus


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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated.1918 Excerpt: ... THE LATER EMBRYO In embryos of P. Banksiana, the size of fig. 47, the apical cell may usually still be found, but by the time the stage shown in fig. 51 is reached it has disappeared. The cylindrical mass of cells L I K J G Fig. 3.--Development of stem tip and cotyledons; dotted line represents plerome of root tip; shaded area, meristem of stem tip; //, /. J, A', fusing cotyledons. enlarges, and about the time the stage shown in fig. 52 is reached the cells near the tip begin to organize into an arch, shown by the dotted line of text fig. 3A. Under this arch is the plerome of the root tip, the first body region to appear. The periblem organizes outside of this dome and is thickest above it on the side toward the suspensor, where it merges with the tissue of the massive root cap. This curved cell arrangement may be recognized in the whole embryos mounted in Venetian turpentine or balsam, but sections show the details of this cell organization much better. The stem tip may be recognized as a slight protuberance in the position formerly occupied by the apical cell, but long after this cell has disappeared. It may first be seen in embryos about 175 JL1X400 n and in living embryos dissected out under water a transparent area develops in the tissues near it, which is shown by the shaded area of B, text fig. 3. The embryo enlarges, and by the time it has reached the size of D the circle of cotyledonary primordia is recognizable. The number of these primordia, like the number of cotyledons, is not constant, and ranges from 3 to 7. Although the cotyledonary primordia are usually equally developed when they first appear, sometimes they are larger or appear sooner on one side than on the other. Figs. / and A' show cases where 2 primordia formed only 1 cotyledon. Pigs....


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Product Details
  • ISBN-13: 9781154486865
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 18
  • Spine Width: 1 mm
  • Width: 189 mm
  • ISBN-10: 1154486869
  • Publisher Date: 08 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 54 gr


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