Bulletin of the Botanical Department, Jamaica Volume 5

Bulletin of the Botanical Department, Jamaica Volume 5

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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. 1898 edition. Excerpt: ... enters the root tissues--by Tschirch, Brunchorst, and others. And the relation between the plant and its nodules has, to some extent, been explained by the Rothamsted experiments, in which the growth and ripening of the plant were shown to be coincident with progressive exhaustion of the nitrogenous matter of the nodules whilst on the other hand, with plants not ripe, or of more than annual growth, there was accumulation in the nodules--that is, provision for future growth. (6) It must, however, be admitted that we are still completely in the dark as to the nature of the chemical process by which nitrogen is first brought into combination within the nodules, and what is the first compound formed. As far as agricultural plants are concerned, it is only those of the.-leguminous sub-order Papilionaceae on the roots of which nodules occur, and which in consequence can thrive without external application of-combined nitrogen. It may, however, be mentioned that the symbosis prevails in the case of other leguminous plants--for instance, of the sub-orders Mimoseae and Caesalpinieae, (7) and even of non-leguminous plants such as the common alder. (8) The methods employed in pot experiments for inducing the formation of nodules have been the application of a soil extract (Hellriegel), _of soil itself (Frank), or the inoculation has been made directly from.the contents of a nodule. Hellriegel's earliest results showed that all aeil extracts are not equally suitable for inoculating certain plants; but-the most systematic and conclusive experiments on this part of the subject are those of Nobbe, who concluded that there is only one micro-organism concerned (Beijerinck's Bacillus radicicola), but that it becomes so altered in the symbiosis...
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Product details

  • Paperback | 176 pages
  • 189 x 246 x 10mm | 327g
  • United States
  • English
  • black & white illustrations
  • 1236962516
  • 9781236962515