Coccid (Scale Insects) of Japan

Coccid (Scale Insects) of Japan

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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. 1902 edition. Excerpt: ...lupines grown in sterilized and uninoculated soil may form small enlargements like young tubercles, I think my demonstration of the common origin of tubercles and lateral roots also has some significance. Assuming that the soil remained sterile, which is not wholly probable, the plant might begin to form lateral roots which, for some unknown reason, aborted while still in the cortex of the mother root. Lateral roots are known to do this, and if the abortion took place early enough, the root character of the new formation might be lost if it had already developed. It seems to me much more probable, however, that both causes were in operation; that the soil did not remain sterile; that the plants were infected by so few or so feeble tubercle-bacteria that the tubercles stimulated to begin to form aborted because the infection was not strong enough. If the leguminous plant, or its separate cells, and the bacteria are parasitically associated, the plant would resist the entrance and growth of the bacteria, and would be much more likely to succeed in this if the attacking bacteria were few or feeble. Overcoming the bacteria, the stimulus to tubercle formation ceases, the tubercle remains rudimentary. That infection of sterilized soil by the tubercle-bacteria is possible, and even difficult to avoid, is known to all who have worked on the subject. This, then, rather than inheritance, accounts for the rudimentary tubercles which Frank describes. The bacteria in the infection thread, which grows through the root-hair and the cortical parenchyma cells of the root to the pericambium layer, multiply, but they multiply most rapidly in the infected cells farthest from the surface of the root. New threads form, which grow out into and infect the cells of more

Product details

  • Paperback | 42 pages
  • 189 x 246 x 2mm | 95g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236549503
  • 9781236549501