Plant bacteriology is the study of bacteria that affect plants, including their taxonomy, ecology, pathogenesis, and management. Bacteria can cause diseases in plants, such as bacterial blight, canker, wilt, and rot, which can have a significant impact on agricultural productivity. Plant bacteriologists study the biology of plant-associated bacteria, including their life cycles, genetic diversity, and adaptation to different environments Bacteria are classified based on several characteristics such as their shape, structure, biochemical properties, and genetic makeup. The classification system for bacteria is constantly evolving and changing as new discoveries are made. Here is a brief overview of the bacterial classification system: 1. Domain: Bacteria belong to the domain Bacteria, which is one of the three domains of life, along with Archaea and Eukarya. 2. Phylum: Bacteria are further classified into different phyla based on their genetic makeup and cellular structure. Some common phyla include Proteobacteria, Firmicutes, Actinobacteria, and Bacteroidetes. 3. Class: Each phylum is further divided into different classes based on specific characteristics. For example, the Proteobacteria phylum is divided into Alpha, Beta, Gamma, Delta, and Epsilon classes. 4. Order: Each class is further divided into orders based on specific characteristics. For example, the Order Enterobacteriales is a group of Gram-negative bacteria that includes common pathogens like Escherichia coli and Salmonella. 5. Family: Each order is further divided into families based on similarities in genetic and biochemical properties. For example, Enterobacteriaceae is a family of Gram-negative bacteria that includes many human pathogens. 6. Genus: Each family is further divided into genera, which are groups of bacteria that share common characteristics. For example, the genus Escherichia includes several species of Gram-negative bacteria, including the well-known pathogen Escherichia coli. 7. Species: Each genus is further divided into species, which are groups of bacteria that share many similarities and can interbreed. For example, Escherichia coli is a species of bacteria that is commonly found in the human gut and can cause illness when it contaminates food or water. It's worth noting that some bacteria are difficult to classify because they have unique characteristics or do not fit neatly into the existing classification system. Additionally, the advent of genetic sequencing has led to the discovery of many new bacterial species, which has expanded our understanding of the diversity of life on Earth.

1. Classification of the domain
bacteria
Domain
Phylum
Bacteria
Firmicutes Proteobacteria
Actinobacteria
+Gram positive - Gram Negative

2. Bacilli
Class Clostridia Mollicutes
order Bacillales Clostridiales
Family Bacillaceae Clostridiaceae
Firmicutes
Phylum

3. order
Mollicutes
Entoplasmatales Acholeplasmatales
Family Spiroplasmataceae Acholeplasmataceae
Spiroplasma Candidatus Phytoplasma

4. Phylum Actinobacteria
Class
order
Family
Actinomycetales
Actinobacteria
Microbacteriaceae Nocardiaceae Streptomycetaceae
Clavibacter,
Curtobacterium,
Rathayibacter, Lefsonia
Rhodococcus Streptomyces

5. Proteobacteria
Phylum
Class
Alphaproteobacteria
Betaproteobacteria
Gammaproteobacteria

6. Class Alphaproteobacteria
order Rhizobiales Rickettsiales
Family Rhizobiaceae Rickettsiaceae
Rhizobium Rickettsia

7. Class Betaproteobacteria
order Burkholderiales
Family
Comamonadaceae
Oxabacteriaceae
Burkholderiaceae
Ralstoniaceae
Acidovorax
Burkholderia
Ralstonia
Herbaspirillum
Janthinobacterium

8. Class
Gammaproteobacteria
order Enterobacteriales
Pseudomonadales
Family
Enterobacteriaceae
pseudomonadaceae
Xanthomonadales
Xanthomonadaceae
Dickeya, Erwinia, Pantoea,
Pectobacterium Pseudomonas Xanthomonas

9. By
AjayDesouza V
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V.AjayDesouza
M.Sc.(Agri) Plant Pathology
Annamalai university
ajaydesouza0003@gmail.com