Leucaena Spp
Mostrando 13-22 de 22 artigos, teses e dissertações.
-
13. Regeneração natural e enriquecimento de sub-bosque de Mimosa caesalpiniifolia Benth (sabiá), em reflorestamentos do Rio de Janeiro. / Regeneração natural e enriquecimento de sub-bosque de Mimosa caesalpiniifolia Benth (sabiá), em reflorestamentos do Rio de Janeiro.
This study was carried out in two comunitys of Rio de Janeiro, Morro do Salgueiro and Urubu. Plants of the family Leguminosa are able to associate to bacterium(rizóbio) and funges micorrízicos, became resistant to ambiental stress. Since they are resistant species, made pure plantations during the years as follows: leucena (Leucaena spp.) and sabiá (Mimos
Publicado em: 2003
-
14. Competition Among Rhizobium spp. for Nodulation of Leucaena leucocephala in Two Tropical Soils †
The successful nodulation of legumes by a Rhizobium strain is determined by the competitive ability of that strain against the mixture of other native and inoculant rhizobia. Competition among six Leucaena rhizobial strains in single and multistrain inoculants were studied. Field inoculation trials were conducted in an oxisol and a mollisol soil, both of whi
-
15. Mimosine, a Toxin Present in Leguminous Trees (Leucaena spp.), Induces a Mimosine-Degrading Enzyme Activity in Some Rhizobium Strains
Thirty-seven Rhizobium isolates obtained from the nodules of leguminous trees (Leucaena spp.) were selected on the basis of their ability to catabolize mimosine, a toxin found in large quantities in the seeds, foliage, and roots of plants of the genera Leucaena and Mimosa. A new medium containing mimosine as the sole source of carbon and nitrogen was used fo
-
16. Isolation of Insertion Sequence ISRLdTAL1145-1 from a Rhizobium sp. (Leucaena diversifolia) and Distribution of Homologous Sequences Identifying Cross-Inoculation Group Relationships †
Insertion sequence (IS) element ISRLdTAL1145-1 from Rhizobium sp. (Leucaena diversifolia) strain TAL 1145 was entrapped in the sacB gene of the positive selection vector pUCD800 by insertional inactivation. A hybridization probe prepared from the whole 2.5-kb element was used to determine the distribution of homologous sequences in a diverse collection of 13
-
17. Nitrogen-Fixing Nodules with Ensifer adhaerens Harboring Rhizobium tropici Symbiotic Plasmids
Ensifer adhaerens is a soil bacterium that attaches to other bacteria and may cause lysis of these other bacteria. Based on the sequence of its small-subunit rRNA gene, E. adhaerens is related to Sinorhizobium spp. E. adhaerens ATCC 33499 did not nodulate Phaseolus vulgaris (bean) or Leucaena leucocephala, but with symbiotic plasmids from Rhizobium tropici C
American Society for Microbiology.
-
18. Multiple copies of nodD in Rhizobium tropici CIAT899 and BR816.
Rhizobium tropici strains are able to nodulate a wide range of host plants: Phaseolus vulgaris, Leucaena spp., and Macroptilium atropurpureum. We studied the nodD regulatory gene for nodulation of two R. tropici strains: CIAT899, the reference R. tropici type IIb strain, and BR816, a heat-tolerant strain isolated from Leucaena leucocephala. A survey revealed
-
19. Phylogenetic relationships and host range of Rhizobium spp. that nodulate Phaseolus vulgaris L.
We determined the nucleotide sequences of 16S rRNA gene segments from five Rhizobium strains that have been isolated from tropical legume species. All share the capacity to nodulate Phaseolus vulgaris L., the common bean. Phylogenetic analysis confirmed that these strains are of two different chromosomal lineages. We defined the host ranges of two strains of
-
20. Serological Relatedness of Rhizobium fredii to Other Rhizobia and to the Bradyrhizobia
Several isolates of Rhizobium fredii were examined for their serological relatedness to each other, to Bradyrhizobium japonicum, and to other fast- and slow-growing rhizobia. Immunofluorescence, agglutination, and immunodiffusion analyses indicated that R. fredii contains at least three separate somatic serogroups, USDA 192, USDA 194, and USDA 205. There was
-
21. Ecological Indicators of Native Rhizobia in Tropical Soils †
The relationship between environment and abundance of rhizobia was described by determining the populations of root nodule bacteria at 14 diverse sites on the island of Maui. Mean annual rainfall at the sites ranged from 320 to 1,875 mm, elevation from 37 to 1,650 m, and soil pH from 4.6 to 7.9. Four different soil orders were represented in this study: ince
-
22. The NodD proteins of Rhizobium sp. strain BR816 differ in their interactions with coinducers and in their activities for nodulation of different host plants.
The early steps of symbiotic nodule formation by Rhizobium spp. on plants require coordinate expression of several nod gene operons, which is accomplished by the activating protein NodD. Rhizobium sp. strain BR816, isolated from Leucaena leucocephala, contains four nodD genes which differ in their interaction with flavonoids. Two of the four NodD proteins, n