Diversity in symbiotic specificity of cowpea rhizobia indigenous to Zimbabwean soils

1996 ◽  
Vol 186 (1) ◽  
pp. 167-171 ◽  
Author(s):  
S. Mpepereki ◽  
A. G. Wollum ◽  
F. Makonese
Keyword(s):  
Symbiotic Specificity ◽  
Cowpea Rhizobia

Symbiotic performance of native cowpea rhizobia of Ethiopia under greenhouse conditions

Green Farming ◽  
2020 ◽  
Vol 11 (2-3) ◽  
pp. 145
Author(s):  
GIRMAYE KENASA ◽  
FASSIL ASSEFA ◽  
B.C. NANDESHWAR
Keyword(s):  
Cowpea Rhizobia

scholarly journals Symbiotic specificity of tropical tree rhizobia for host legumes

2001 ◽  
Vol 149 (3) ◽  
pp. 495-507 ◽  
Author(s):  
Abdullahi Bala ◽  
Ken E. Giller
Keyword(s):  
Tropical Tree ◽  
Symbiotic Specificity

scholarly journals Host-dependent Expression of Uptake Hydrogenase in Cowpea Rhizobia

Microbiology ◽  
1985 ◽  
Vol 131 (1) ◽  
pp. 93-96 ◽  
Author(s):  
F. C. GARG ◽  
R. P. GARG ◽  
K. KUKREJA ◽  
S. S. SINDHU ◽  
P. TAURO
Keyword(s):  
Uptake Hydrogenase ◽  
Cowpea Rhizobia

The transport and metabolism of glucose in cowpea rhizobia

1983 ◽  
Vol 29 (4) ◽  
pp. 398-406 ◽  
Author(s):  
Mark D. Stowers ◽  
Gerald H. Elkan
Keyword(s):  
Potassium Cyanide ◽  
Tca Cycle ◽  
Pentose Phosphate ◽  
Free Living ◽  
Phosphogluconate Dehydrogenase ◽  
Metabolism Enzymes ◽  
Carbonyl Cyanide ◽  
Cowpea Rhizobia ◽  
Enzymes Of Carbohydrate Metabolism ◽  
Free Living Conditions

Cell-free extracts of several strains of cowpea rhizobia grown under free-living conditions were surveyed for key enzymes of carbohydrate metabolism. Enzymes of the Entner–Doudoroff (ED) and Embden–Meyerhof–Parnas (EMP) pathways were detected while 6-phosphogluconate dehydrogenase was not detected, indicating the apparent absence of the pentose phosphate (PP) pathway. Transketolase and transaldolase reactions were present, indicating a pathway for the synthesis of pyrimidines and purines from fructose-6-phosphate and glyceraldehyde-3-phosphate. Radiorespirometric analysis with specifically labelled glucose indicated that the ED pathway with the hexose cycle was the primary pathway of glucose dissimilation. The presence of isocitrate and malate dehydrogenases and results of radiorespirometric analysis with pyruvate and succinate demonstrates an operational tricarboxylic acid (TCA) cycle in glucose-grown cowpea rhizobia. The transport of glucose was inhibited by carbonyl cyanide m-chlorphenylhydrazone (CCCP), dinitrophenol, and potassium cyanide indicating that the process was active, probably using an energized membrane state. The transport of glucose was glucose specific. A lower rate of glucose uptake was seen when cells were cultured on hexoses other than glucose.

scholarly journals Differential Effects of Rare Specific Flavonoids on Compatible and Incompatible Strains in the Myrica gale-Frankia Actinorhizal Symbiosis

2010 ◽  
Vol 76 (8) ◽  
pp. 2451-2460 ◽  
Author(s):  
Jean Popovici ◽  
Gilles Comte ◽  
�milie Bagnarol ◽  
Nicole Alloisio ◽  
Pascale Fournier ◽  
...  
Keyword(s):  
Secondary Metabolites ◽  
Plant Secondary Metabolites ◽  
Biotic Interactions ◽  
Spectroscopic Techniques ◽  
Plant Phenolics ◽  
Actinorhizal Symbiosis ◽  
Myrica Gale ◽  
Legume Symbiosis ◽  
Symbiotic Specificity

ABSTRACT Plant secondary metabolites, and specifically phenolics, play important roles when plants interact with their environment and can act as weapons or positive signals during biotic interactions. One such interaction, the establishment of mutualistic nitrogen-fixing symbioses, typically involves phenolic-based recognition mechanisms between host plants and bacterial symbionts during the early stages of interaction. While these mechanisms are well studied in the rhizobia-legume symbiosis, little is known about the role of plant phenolics in the symbiosis between actinorhizal plants and Frankia genus strains. In this study, the responsiveness of Frankia strains to plant phenolics was correlated with their symbiotic compatibility. We used Myrica gale, a host species with narrow symbiont specificity, and a set of compatible and noncompatible Frankia strains. M. gale fruit exudate phenolics were extracted, and 8 dominant molecules were purified and identified as flavonoids by high-resolution spectroscopic techniques. Total fruit exudates, along with two purified dihydrochalcone molecules, induced modifications of bacterial growth and nitrogen fixation according to the symbiotic specificity of strains, enhancing compatible strains and inhibiting incompatible ones. Candidate genes involved in these effects were identified by a global transcriptomic approach using ACN14a strain whole-genome microarrays. Fruit exudates induced differential expression of 22 genes involved mostly in oxidative stress response and drug resistance, along with the overexpression of a whiB transcriptional regulator. This work provides evidence for the involvement of plant secondary metabolites in determining symbiotic specificity and expands our understanding of the mechanisms, leading to the establishment of actinorhizal symbioses.

Regional collapse of symbiotic specificity between lucanid beetles and canestriniid mites

2012 ◽  
Vol 99 (11) ◽  
pp. 959-965 ◽  
Author(s):  
Kimiko Okabe ◽  
Hayato Masuya ◽  
Natusmi Kanzaki ◽  
Hisatomo Taki
Keyword(s):  
Symbiotic Specificity
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