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Horizontal transfer of potential mobile units in phytoplasmas
Chuan Ku1, Wen-Sui Lo, Chih-Horng Kuo
1Institute of Plant and Microbial Biology; Academia Sinica; Taipei, Taiwan.
Mobile Genetic Elements
|November 20, 2013
Summary
Potential Mobile Units (PMUs) in phytoplasmas can move between different bacterial groups, facilitating horizontal gene transfer. This mobility, especially with effector genes, impacts phytoplasma evolution and plant disease ecology.
Area of Science:
- Plant Pathology
- Microbial Genetics
- Bacterial Evolution
Background:
- Phytoplasmas are uncultivated bacteria causing significant plant diseases.
- They manipulate host plants via effector proteins for multiplication and vector dispersal.
- Potential Mobile Units (PMUs) are composite transposons found in reduced phytoplasma genomes.
Purpose of the Study:
- To investigate the mobility and evolutionary significance of Potential Mobile Units (PMUs) in phytoplasmas.
- To analyze the genome of a peanut witches' broom (PnWB) phytoplasma (16SrII group).
Main Methods:
- Genome sequencing and comparative analysis of the PnWB phytoplasma.
- Phylogenetic analysis of species and PMU genes.
Main Results:
- The PnWB PMU likely originated from the 16SrI phytoplasma group, indicating horizontal transfer.
- PMUs facilitate not only transposition within a genome but also horizontal transfer between divergent phytoplasma lineages.
- PMUs are associated with effector genes, suggesting a role in phytoplasma adaptation.
Conclusions:
- Potential Mobile Units (PMUs) are mobile genetic elements capable of horizontal transfer across phytoplasma lineages.
- The mobility of PMUs, particularly those carrying effector genes, has profound implications for phytoplasma evolution and plant disease dynamics.
- Understanding PMU mobility is crucial for managing phytoplasma-induced plant diseases.
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