Seed Exudates
Mostrando 1-12 de 21 artigos, teses e dissertações.
-
1. First record of the association of the weevil Loncophorus longinasus with the fruit of munguba, Pseudobombax munguba in Central Amazonia, Brazil
RESUMO Este é o primeiro registro de ocorrência de Loncophorus longinasus em frutos da árvore munguba, Pseudobombax munguba, no Estado do Amazonas, Brasil. Alguns aspectos morfológicos e biológicos de L. longinasus são apresentados. Adultos foram obtidos quando emergiam naturalmente durante a abertura do fruto da munguba para a dispersão das sementes.
Acta Amaz.. Publicado em: 25/11/2019
-
2. Seed exudates of Sesbania virgata (Cav.) Pers. stimulate the asymbiotic phase of the arbuscular mycorrhizal fungus Gigaspora albida Becker & Hall
RESUMO Sesbania virgata é uma leguminosa utilizada na restauração de áreas degradadas e que forma simbiose com fungos micorrízicos arbusculares (AMF). Suas sementes exudam metabólitos secundários que podem influenciar a colonização pelos AMF. Neste trabalho, estudamos os efeitos de exsudatos de sementes (SE) e radiculares (RE) de S. virgata na fase
Hoehnea. Publicado em: 04/04/2019
-
3. Phytotoxic and antifungal compunds from legume seeds that accumulate glactomannan and xyloglucan as cell wall storage polysacharides / Substancias fitotoxicas e antifungicas em sementes de leguminosas que acumulam gelactomanano e xiloglucano como carboidratos de reservas de parede celular
Sesbania virgata (Cav.) Pers. and Hymenaea courbaril L. var. stilbocarpa (Fabaceae) are two tropical legume species with seeds that contain galactomannan and xyloglucan, respectively, as seed storage polysaccharides, which are broken down after germination, generating large amounts of monosaccharides and oligosaccharides. Part of these sugars is released to
Publicado em: 2008
-
4. Chemotaxis of Bradyrhizobium japonicum to soybean exudates.
The chemotactic response of Bradyrhizobium japonicum toward soybean seed and root exudates was examined. Assays using various isoflavones and fractionated exudate indicated that isoflavones are not the principal attractants in exudates. Likewise, induction of nod genes with isoflavones or seed exudate before assay did not enhance chemotaxis. Screening of num
-
5. Differential Inactivation of Seed Exudate Stimulation of Pythium ultimum Sporangium Germination by Enterobacter cloacae Influences Biological Control Efficacy on Different Plant Species
This study was initiated to understand whether differential biological control efficacy of Enterobacter cloacae on various plant species is due to differences in the ability of E. cloacae to inactivate the stimulatory activity of seed exudates to Pythium ultimum sporangium germination. In biological control assays, E. cloacae was effective in controlling Pyt
American Society for Microbiology.
-
6. Effect of lectin on nodulation by wild-type Bradyrhizobium japonicum and a nodulation-defective mutant.
The nodulation characteristics of wild-type Bradyrhizobium japonicum USDA 110 and mutant strain HS111 were examined. Mutant strain HS111 exhibits a delayed-nodulation phenotype, a result of its inability to initiate successful nodulation promptly following inoculation of the soybean root. Previously, we showed that the defect in initiation of infection leadi
-
7. Expression of a Pseudomonas putida Aminotransferase Involved in Lysine Catabolism Is Induced in the Rhizosphere
Using a transposon carrying a promoterless lux operon to generate transcriptional fusions by insertional mutagenesis, we have identified a Pseudomonas putida gene with increased expression in the presence of corn root exudates. Expression of the transcriptional fusion, induced by the amino acid lysine, was detected in P. putida in the rhizosphere of plants a
American Society for Microbiology.
-
8. Cell Density-Dependent Gene Contributes to Efficient Seed Colonization by Pseudomonas putida KT2440
We have characterized the expression pattern of a gene, ddcA, involved in initial colonization of corn seeds by Pseudomonas putida KT2440. The ddcA gene codes for a putative membrane polypeptide belonging to a family of conserved proteins of unknown function. Members of this family are widespread among prokaryotes and include the products of a Salmonella ent
American Society for Microbiology.
-
9. Role of pfkA and General Carbohydrate Catabolism in Seed Colonization by Enterobacter cloacae
Enterobacter cloacae A-11 is a transposon mutant of strain 501R3 that was deficient in cucumber spermosphere colonization and in the utilization of certain carbohydrates (D. P. Roberts, C. J. Sheets, and J. S. Hartung, Can. J. Microbiol. 38:1128–1134, 1992). In vitro growth of strain A-11 was reduced or deficient on most carbohydrates that supported growth
American Society for Microbiology.
-
10. Zoospore Homing and Infection Events: Effects of the Biocontrol Bacterium Burkholderia cepacia AMMDR1 on Two Oomycete Pathogens of Pea (Pisum sativum L.)
Burkholderia cepacia AMMDR1 is a biocontrol agent that protects pea and sweet corn seeds from Pythium damping-off in field experiments. The goal of this work was to understand the effect of B. cepacia AMMDR1 on Pythium aphanidermatum and Aphanomyces euteiches zoospore homing events and on infection of pea seeds or roots. In vitro, B. cepacia AMMDR1 caused zo
American Society for Microbiology.
-
11. Evidence Suggesting Protozoan Predation on Rhizobium Associated with Germinating Seeds and in the Rhizosphere of Beans (Phaseolus vulgaris L.)
Changes in populations of microorganisms around germinating bean (Phaseolus vulgaris L.) seeds, in the rhizosphere of bean, and in a model rhizosphere were studied. Strains of Rhizobium phaseoli that were resistant to streptomycin and thiram were used, and as few as 300 R. phaseoli cells per g of soil could be enumerated with a selective medium that was devi
-
12. Analysis of Expression of a Phenazine Biosynthesis Locus of Pseudomonas aureofaciens PGS12 on Seeds with a Mutant Carrying a Phenazine Biosynthesis Locus-Ice Nucleation Reporter Gene Fusion
A derivative of Pseudomonas aureofaciens PGS12 expressing a promoterless ice nucleation gene under the control of a phenazine biosynthesis locus was used to study the expression of a phenazine antibiotic locus (Phz) during bacterial seed colonization. Seeds of various plants were inoculated with wild-type PGS12 and a PGS12 ice nucleation-active phz:inaZ mark