Influence of pH and calcium on the growth,polysaccharide production and symbiotic association of<Emphasis Type="Italic"> Sinorhizobium meliloti</Emphasis> SEMIA 116 with alfalfa roots |
| |
| Authors: | Carolina?Delavechia Eugenio?Hampp Adriana?Fabra Email author" target="_blank">Stella?CastroEmail author |
| |
| Institution: | (1) Facultad de Ciencias Exactas, Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, 5800 Río Cuarto, Córdoba, Argentina; |
| |
| Abstract: | The Sinorhizobium -legume interaction is sensitive to a number of environmental factors, soil acidity being one of the most important. In the typic Hapludoll soil of the central-southern region of Córdoba (Argentine) it was found that the nodulation of alfalfa ( Medicago sativaL.) roots was impaired with a reduction in shoot dry matter under conditions of soil acidity (pH 5.5) Our results showed that the addition of lime as dolomitic limestone at a concentration of 1 t ha -1to acid soil caused a significant increase in the nodulation of alfalfa roots inoculated with the strain Sinorhizobium meliloti SEMIA 116 (recommended inoculum for alfalfa) in the greenhouse experiments. The success of the lime treatment may be related not only to an increase in the pH values but also to an increase in the Ca concentration, improving the growth of S. meliloti and its nodulation ability under acidic conditions. In this study, we also demonstrated an increment in the bacterial growth rate as well as in the production of exopolysaccharides and lipopolysaccharides under low pH (5.5) and a high Ca concentration (5 mM) in the culture medium. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
