. Bacteria in relation to country life. Bacteria. Relations oj Bacteria to Legumes 217 soon turn yellow and pass into a state of "nitrogen- ; In this weakened state, they have but slight power of resistance, and the nodule-bacteria find it comparatively easy to enter their roots. On the other hand, the legumes grow- ing in soils well supplied with available nitrogen compounds remain vigor- ous and retain a high power of resistance, thus precluding the entrance of the bacteria. Further- more, it is known that after some tubercles are formed on the legume plants, the formation o
. Bacteria in relation to country life. Bacteria. Relations oj Bacteria to Legumes 217 soon turn yellow and pass into a state of "nitrogen- ; In this weakened state, they have but slight power of resistance, and the nodule-bacteria find it comparatively easy to enter their roots. On the other hand, the legumes grow- ing in soils well supplied with available nitrogen compounds remain vigor- ous and retain a high power of resistance, thus precluding the entrance of the bacteria. Further- more, it is known that after some tubercles are formed on the legume plants, the formation of additional tubercles be- comes more difficult. Now, since already possessing a few tuber- cles are better supplied with nitrogen, their vigor is increased and they can better resist the attacks of the bacteria. Virulence.—Another conception in the relations of legumes and their nodule bacteria should not be over- looked. In considering the greater or slighter resist- ing power of different plants under different con- ditions, it should be remembered that the bacteria, also, may display differences in their ability to penetrate the legume roots, as well as in their ability to fix atmos-. Fig. .35. Root tubercles of healthy al- falfa plants. The tubercles are small and Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Lipman, Jacob Goodale, 1874-1939. New York, Macmillan
Size: 1300px × 1922px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1911
