ISSN:
1573-5036
Keywords:
Acid-sensitive step
;
Nitrogen content
;
Nitrogen fixation
;
Pisum sativum
;
Rhizobium leguminosarum
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Summary Experiments were performed to measure the pH-sensitive steps in nodulation and symbiotic fixation byPisum sativum and isolate RP-212-1 ofRhizobium leguminosarum. An aeroponic system with rigorous pH control was used to obtain numerous effective nodules. After exposure to various pH levels, the following responses were measured: (1) legume root growth and development, (2) survival and growth rate of a single effective bacterial isolate, (3) degree of nodulation, (4) rate of nitrogen fixation, (5) plant biomass, and (6) nitrogen content of plants. Both bacterial growth and root development were adequate at all pH levels from 4.4 to 6.6, but efficient nodulation and nitrogen fixation did not occur at pH 4.8 and below. The processes required for symbiosis were about 10 times as sensitive to acidity as either bacterial growth or root growth alone. Nodulation was the most acid-sensitive step.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02197954
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