Selection of Rhizobium strains as inoculants
The first characteristic of importance in choosing strains of Rhizobium is their capacity to fix nitrogen, and selection for this trait is widespread. Also well known is the need to have isolates that compete with other strains of the same species, and such selections are routinely made in research or commercial practices. Not well recognized is the need for obtaining root-nodule bacteria that are able to overcome ecological constraints that limit their survival on seeds or their survival and growth in soil and the root zone. A major stress is drying, and strains can be selected that are resistant to water loss both in soil and on seeds. Acid and temperature extremes may also be of significance, and methods are available to screen and often to select strains resistant to these two abiotic stresses. In some soils salinity and alkalinity may be major stresses, but often these stresses are exerted more on the plant than on the bacteria; nevertheless, rhizobia can be selected that withstand these deleterious factors. In many farming systems, fungicides are applied to seeds for control of plant pathogens, and strains can be selected or techniques can be devised to protect the rhizobia from the deleterious effects of these chemicals. In addition, rhizobia are often susceptible to predation by protozoa in the rhizosphere and they are poor competitors with the more fast growing bacteria in this zone, and techniques will be suggested by which these significant biological stresses may be minimized
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San José (Costa Rica)
1985
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| Subjects: | RHIZOBIUM, FIJACION DEL NITROGENO, SELECCION, INOCULACION, |
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KOHA-OAI-BVE:401632022-11-15T18:33:23ZSelection of Rhizobium strains as inoculantsBiotechnology in the Americas 2: applications in tropical agriculture, a symposium 41289 Alexander, M. Cornell University, Nueva York (EUA). Dept. of Agronomy 95949 Mora Poltronieri, H. ed. 12546 INTERCIENCIA Association, Washington, D.C. (EUA) Consejo Nacional de Investigaciones Cientificas y Tecnológicas San José, Costa Rica 6120 Symposium Biotechnology in the Americas II: Applications in Tropical Agriculture San José (Costa Rica) 14-17 Jul 1985 San José (Costa Rica)1985The first characteristic of importance in choosing strains of Rhizobium is their capacity to fix nitrogen, and selection for this trait is widespread. Also well known is the need to have isolates that compete with other strains of the same species, and such selections are routinely made in research or commercial practices. Not well recognized is the need for obtaining root-nodule bacteria that are able to overcome ecological constraints that limit their survival on seeds or their survival and growth in soil and the root zone. A major stress is drying, and strains can be selected that are resistant to water loss both in soil and on seeds. Acid and temperature extremes may also be of significance, and methods are available to screen and often to select strains resistant to these two abiotic stresses. In some soils salinity and alkalinity may be major stresses, but often these stresses are exerted more on the plant than on the bacteria; nevertheless, rhizobia can be selected that withstand these deleterious factors. In many farming systems, fungicides are applied to seeds for control of plant pathogens, and strains can be selected or techniques can be devised to protect the rhizobia from the deleterious effects of these chemicals. In addition, rhizobia are often susceptible to predation by protozoa in the rhizosphere and they are poor competitors with the more fast growing bacteria in this zone, and techniques will be suggested by which these significant biological stresses may be minimizedThe first characteristic of importance in choosing strains of Rhizobium is their capacity to fix nitrogen, and selection for this trait is widespread. Also well known is the need to have isolates that compete with other strains of the same species, and such selections are routinely made in research or commercial practices. Not well recognized is the need for obtaining root-nodule bacteria that are able to overcome ecological constraints that limit their survival on seeds or their survival and growth in soil and the root zone. A major stress is drying, and strains can be selected that are resistant to water loss both in soil and on seeds. Acid and temperature extremes may also be of significance, and methods are available to screen and often to select strains resistant to these two abiotic stresses. In some soils salinity and alkalinity may be major stresses, but often these stresses are exerted more on the plant than on the bacteria; nevertheless, rhizobia can be selected that withstand these deleterious factors. In many farming systems, fungicides are applied to seeds for control of plant pathogens, and strains can be selected or techniques can be devised to protect the rhizobia from the deleterious effects of these chemicals. In addition, rhizobia are often susceptible to predation by protozoa in the rhizosphere and they are poor competitors with the more fast growing bacteria in this zone, and techniques will be suggested by which these significant biological stresses may be minimizedRHIZOBIUMFIJACION DEL NITROGENOSELECCIONINOCULACION |
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RHIZOBIUM FIJACION DEL NITROGENO SELECCION INOCULACION RHIZOBIUM FIJACION DEL NITROGENO SELECCION INOCULACION |
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RHIZOBIUM FIJACION DEL NITROGENO SELECCION INOCULACION RHIZOBIUM FIJACION DEL NITROGENO SELECCION INOCULACION 41289 Alexander, M. Cornell University, Nueva York (EUA). Dept. of Agronomy 95949 Mora Poltronieri, H. ed. 12546 INTERCIENCIA Association, Washington, D.C. (EUA) Consejo Nacional de Investigaciones Cientificas y Tecnológicas San José, Costa Rica 6120 Symposium Biotechnology in the Americas II: Applications in Tropical Agriculture San José (Costa Rica) 14-17 Jul 1985 Selection of Rhizobium strains as inoculants |
| description |
The first characteristic of importance in choosing strains of Rhizobium is their capacity to fix nitrogen, and selection for this trait is widespread. Also well known is the need to have isolates that compete with other strains of the same species, and such selections are routinely made in research or commercial practices. Not well recognized is the need for obtaining root-nodule bacteria that are able to overcome ecological constraints that limit their survival on seeds or their survival and growth in soil and the root zone. A major stress is drying, and strains can be selected that are resistant to water loss both in soil and on seeds. Acid and temperature extremes may also be of significance, and methods are available to screen and often to select strains resistant to these two abiotic stresses. In some soils salinity and alkalinity may be major stresses, but often these stresses are exerted more on the plant than on the bacteria; nevertheless, rhizobia can be selected that withstand these deleterious factors. In many farming systems, fungicides are applied to seeds for control of plant pathogens, and strains can be selected or techniques can be devised to protect the rhizobia from the deleterious effects of these chemicals. In addition, rhizobia are often susceptible to predation by protozoa in the rhizosphere and they are poor competitors with the more fast growing bacteria in this zone, and techniques will be suggested by which these significant biological stresses may be minimized |
| format |
|
| topic_facet |
RHIZOBIUM FIJACION DEL NITROGENO SELECCION INOCULACION |
| author |
41289 Alexander, M. Cornell University, Nueva York (EUA). Dept. of Agronomy 95949 Mora Poltronieri, H. ed. 12546 INTERCIENCIA Association, Washington, D.C. (EUA) Consejo Nacional de Investigaciones Cientificas y Tecnológicas San José, Costa Rica 6120 Symposium Biotechnology in the Americas II: Applications in Tropical Agriculture San José (Costa Rica) 14-17 Jul 1985 |
| author_facet |
41289 Alexander, M. Cornell University, Nueva York (EUA). Dept. of Agronomy 95949 Mora Poltronieri, H. ed. 12546 INTERCIENCIA Association, Washington, D.C. (EUA) Consejo Nacional de Investigaciones Cientificas y Tecnológicas San José, Costa Rica 6120 Symposium Biotechnology in the Americas II: Applications in Tropical Agriculture San José (Costa Rica) 14-17 Jul 1985 |
| author_sort |
41289 Alexander, M. Cornell University, Nueva York (EUA). Dept. of Agronomy |
| title |
Selection of Rhizobium strains as inoculants |
| title_short |
Selection of Rhizobium strains as inoculants |
| title_full |
Selection of Rhizobium strains as inoculants |
| title_fullStr |
Selection of Rhizobium strains as inoculants |
| title_full_unstemmed |
Selection of Rhizobium strains as inoculants |
| title_sort |
selection of rhizobium strains as inoculants |
| publisher |
San José (Costa Rica) |
| publishDate |
1985 |
| work_keys_str_mv |
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| _version_ |
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