Phytopathology Volume . 4

Phytopathology Volume . 4

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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. 1914 edition. Excerpt: ...The arrangement of these internal cork layers is decidedly irregular, branching occurring in all directions in the majority of cases. The cell contents are chiefly tannin compounds. Diseased. As in the cork cells of the primary cortex, very few changes are to be noticed here. The cell walls, contents, shape, and size remain unchanged. No hyphae were seen penetrating the cell walls. It was observed, however, that masses of mycelium were forcing apart these layers of cork cells, and, as the fan-shaped mycelium advances, a wedging process takes place, splitting the layers of this tissue. Nothing was observed that would indicate that the fungus excretes an enzyme, since this derangement of layers seems to be a purely mechanical process. The individual cells remain practically unchanged. The mycelium of the fungus shows a tendency to follow the layers of cork, for wherever there are cork layers in the diseased portion of the stem, there are also masses of the mycelium in varying amounts, the exact reasons for this fact remaining for further research. Sderenchyma Normal. The bast fibers and the stone cells of the sclerenchyma in the pericycle are the same in structure, general arrangement, size, shape, and contents as the sclerenchyma of the primary cortex. Diseased. This tissue in diseased stems remains practically unchanged and shows no effects whatever from the invasion of the fungus. The walls remain strongly lignified, and are not penetrated by the mycelium, neither are they broken down. Parenchyma Normal. The parenchymatous cells in this portion of the stem differ little from the parenchymatous cells of the primary cortex. The cell walls are mostly cellulose, uniformly thickened and are somewhat lignified in the process of secondary more

Product details

  • Paperback | 172 pages
  • 189 x 246 x 9mm | 318g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236579852
  • 9781236579850