Ecology and Evolution of Rhizobia: Principles and Applications - Tapa blanda

Sinopsis

Preface

Wen Xin Chen

Unit 1. General description of rhizobia

En Tao Wang

Chapter 1. Symbiosis between rhizobia and legumes

Section 1. Symbiosis of rhizobia and legumes

Rhizobia

Rhizobia-legume symbiosis

Section 2. Importance of rhizobia and rhizobial research

History of rhizobial studies

Ecological and economic importance of rhizobia

Model of microbe-plant interaction

Concluding remarks and perspectives

References

Unit 2. Diversity and evolution of rhizobia

En Tao Wang, Chang Fu Tian, and J. Peter W. Young

Chapter 2. History of rhizobial taxonomy

Section 1. Bacterial diversity and taxonomy

Classification, identification and nomenclature.

Section 2. History of studies on rhizobial diversity and taxonomy

Cross-nodulation groups

Numerical taxonomy

DNA/DNA hybridization

Polyphasic taxonomy

Chapter 3. Current Systematics of rhizobia

Section 1. Current methodology for studying diversity and taxonomy

Sampling strategies: how many strains to sample

Recommended genes for studying phylogeny and genomic diversity

Current criteria for identification and description of novel species

Section 2. Phylogeny and systematics of rhizobia.

Section 3. Alpha-rhizobia.

Section 4. Beta-rhizobia.

Chapter 4. Genomics and evolution of rhizobia

Section 1. The general organization of rhizobial genomes.

Replicons: chromosome, chromid, and plasmid.

Symbiosis plasmid and symbiosis island.

Section 2. Evolution of core and accessory genes.

Characteristics of core and accessory genes.

Main evolutionary forces shaping the diversity of core and accessory genes.

Concluding remarks and perspectives

References

Unit 3. Diversity and evolution of rhizobial symbiosis genes

Chang Fu Tian, Wen Feng Chen, and J. Peter W. Young

Chapter 5. Symbiosis genes: diversity and organization

Section 1. Pathways of diverse functions involved in symbiosis.

Key symbiosis genes: nodulation and nitrogen fixation genes, nod-independent rhizobia.

Symbiosis related functions: exopolysaccharides, secretion systems, and others.

Section 2. The organization of symbiosis related genes.

The distribution of symbiosis related genes in rhizobial genomes.

Chapter 6. Evolution of symbiosis genes: Vertical and horizontal gene transfer

Section 1. Interaction between the symbiosis genes and the core genome

Section 2. Horizontal transfer of symbiosis genes and their integration into the core genome

Chapter 7. Diversity of interactions between rhizobia and legumes

Section 1. Rhizobia with wide host ranges.

NGR 234, etc.

Section 2. Rhizobia associated with symbiotically specific plants.

Alfalfa, chickpea, Amorpha, etc.

Section 3. Rhizobia associated with promiscuous plants.

Soybean, Sophora, common bean, peanut.

Section 4. Rhizobial infection through root hair or crack.

Section 5. Determinate or indeterminate root nodules.

Section 6. Swollen or non-swollen bacteroids.

Concluding remarks and perspectives

References

Unit 4. Interaction of rhizobia, environments and legumes

Wen Feng Chen, and Chang Fu Tian

Chapter 8. Geographical distribution of rhizobia

Section 1. Biogeography of rhizobial species.

Specific focus on soybean, Caragana, Astragalus, broad bean, peanut, Sophora, Phaseolus vulgaris.

Section 2. Biogeography of rhizobial populations

Alfalfa rhizobia, soybean rhizobia

Chapter 9. Environmental determinants of biogeography

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