Rhizobium meliloti inoculation of alfalfa selected for tolerance to acid,aluminum-rich soils |
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Authors: | P. G. Hartel J. H. Bouton |
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Affiliation: | (1) Department of Agronomy, University of Georgia, 30602 Athens, GA, USA |
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Abstract: | Alfalfa (Medicago sativa L.) growth and nodulation in acid soil is reduced because the plant and its bacterial symbiontRhizobium meliloti cannot tolerate acid, aluminum-rich soil. A study was conducted to determine if a relatively acid-tolerant alfalfa germplasm combined with a relatively acid-tolerantR. meliloti strain could overcome these limitations. In a light room study, an acid-tolerant alfalfa germplasm inoculated with a more acid-tolerantR. meliloti strain produced greater top growth, nodule number and weight, and acetylene reduction values in an unlimed soil (pH 4.6) than the same germplasm inoculated with a relatively acid-sensitiveR. meliloti strain or an acid-sensitive germplasm inoculated with either a relatively acid-tolerant or acid-sensitiveR. meliloti strain. |
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Keywords: | acetylene reduction acid-tolerant germplasm Al Al toxicity lucerne Medicago sativa N2-fixation nodulation top dry weight |
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