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Phytoplasmas and Hemiptera pathogens
Research Guide
What is Phytoplasmas and Hemiptera pathogens?
Phytoplasmas are wall-less, phloem-limited bacterial plant pathogens transmitted by Hemiptera insect vectors such as leafhoppers, planthoppers, and psyllids, which facilitate their spread and impact on host plants including citrus.
Research on phytoplasmas and Hemiptera pathogens encompasses 65,761 works focused on pathogen transmission, genome sequencing, and disease control in plants like citrus. Insect vectors, primarily leafhoppers, planthoppers, and psyllids, transmit phytoplasmas causing damage in hundreds of commercial and native plants. Key studies classify phytoplasmas into 16Sr groups using RFLP analyses of 16S rRNA and ribosomal protein genes.
Topic Hierarchy
Research Sub-Topics
Phytoplasma Genome Sequencing
Researchers sequence and annotate phytoplasma genomes to identify virulence factors and evolutionary adaptations. Comparative genomics reveals ribosomal protein gene markers for classification.
Huanglongbing Pathogen Biology
This sub-topic studies Candidatus Liberibacter asiaticus in citrus, focusing on host-pathogen interactions and systemic infection. Research covers phloem colonization and symptom development.
Psyllid Vector Transmission Phytoplasmas
Studies elucidate acquisition, latency, and inoculation dynamics of phytoplasmas by psyllid vectors. Researchers investigate salivary gland barriers and pathogen-vector molecular interactions.
Phytoplasma-Plant Host Interactions
This area examines phytoplasma effects on plant physiology, including witches' broom and phyllody symptoms via effector proteins. Transcriptomics reveals host defense suppression.
Integrated Control of Phytoplasma Diseases
Research develops vector management, rogueing, and antibiotic alternatives for phytoplasma control. Field trials assess IPM efficacy across crops like grapevine and coconut.
Why It Matters
Phytoplasmas transmitted by Hemiptera vectors cause significant crop losses, as seen in Huanglongbing, a century-old disease devastating citrus orchards worldwide, detailed in "Huanglongbing : a destructive, newly-emerging, century-old disease of citrus" (Bové, 2006) with 2048 citations. "INSECT VECTORS OF PHYTOPLASMAS" (Weintraub and Beanland, 2005) identifies leafhoppers, planthoppers, and psyllids as primary vectors for diseases affecting hundreds of plants, limiting control efforts due to few identified vectors. Classification in "Revised Classification Scheme of Phytoplasmas based on RFLP Analyses of 16S rRNA and Ribosomal Protein Gene Sequences" (Lee et al., 1998) into 14 major 16Sr groups from 34 strains supports targeted diagnostics and management in agriculture.
Reading Guide
Where to Start
"INSECT VECTORS OF PHYTOPLASMAS" by Weintraub and Beanland (2005) provides an accessible entry point, reviewing transmission by leafhoppers, planthoppers, and psyllids across hundreds of plants.
Key Papers Explained
"Revised Classification Scheme of Phytoplasmas based on RFLP Analyses of 16S rRNA and Ribosomal Protein Gene Sequences" by Lee et al. (1998) establishes 14 16Sr groups from 34 strains using RFLP, foundational for taxonomy. "INSECT VECTORS OF PHYTOPLASMAS" by Weintraub and Beanland (2005) builds on this by detailing Hemiptera transmission mechanisms. "Huanglongbing : a destructive, newly-emerging, century-old disease of citrus" by Bové (2006) applies these concepts to psyllid-vectored Liberibacter in citrus.
Paper Timeline
Most-cited paper highlighted in red. Papers ordered chronologically.
Advanced Directions
Genome annotation advances with BRAKER2 by Brůna et al. (2021) enable sequencing of phytoplasma and vector symbiont genomes, as in Buchnera sp. studies. Focus remains on unvectorized diseases and RFLP refinements for emerging strains.
Papers at a Glance
| # | Paper | Year | Venue | Citations | Open Access |
|---|---|---|---|---|---|
| 1 | Regeneration and molecular characterization of intergeneric so... | 2002 | Plant Cell Reports | 2.2K | ✕ |
| 2 | Huanglongbing : a destructive, newly-emerging, century-old dis... | 2006 | HAL (Le Centre pour la... | 2.0K | ✕ |
| 3 | BRAKER2: automatic eukaryotic genome annotation with GeneMark-... | 2021 | NAR Genomics and Bioin... | 1.7K | ✓ |
| 4 | IMMUNOLOGICAL FUNCTION OF THE THYMUS | 1961 | The Lancet | 1.4K | ✕ |
| 5 | Genome sequence of the endocellular bacterial symbiont of aphi... | 2000 | Nature | 1.3K | ✓ |
| 6 | Lectins as Plant Defense Proteins | 1995 | PLANT PHYSIOLOGY | 1.2K | ✓ |
| 7 | 16S rRNA phylogenetic analysis of the bacterial endosymbionts ... | 1992 | Proceedings of the Nat... | 1.1K | ✓ |
| 8 | Selection on Codon Bias | 2008 | Annual Review of Genetics | 1.1K | ✕ |
| 9 | INSECT VECTORS OF PHYTOPLASMAS | 2005 | Annual Review of Entom... | 1.0K | ✕ |
| 10 | Revised Classification Scheme of Phytoplasmas based on RFLP An... | 1998 | International Journal ... | 1.0K | ✕ |
Frequently Asked Questions
What are the main insect vectors of phytoplasmas?
Leafhoppers, planthoppers, and psyllids serve as the primary insect vectors of phytoplasmas. These Hemiptera insects transmit pathogens causing diseases in hundreds of commercial and native plants. Identification of vectors remains limited for many phytoplasma diseases.
How are phytoplasmas classified?
Phytoplasmas are classified into 14 major 16Sr groups based on RFLP analyses of 16S rRNA and ribosomal protein gene sequences from 34 strains. This scheme uses nested PCR products digested with 17 restriction enzymes to delineate pattern types. Similarity coefficients from these analyses differentiate the groups.
What is Huanglongbing in relation to phytoplasmas and Hemiptera?
Huanglongbing is a destructive citrus disease associated with Candidatus Liberibacter species vectored by psyllids. It has emerged as a major threat to citrus production. The disease's impact is documented in over 2000 citations on its pathology.
Why is vector identification important for phytoplasma diseases?
Insect vectors like leafhoppers and psyllids are identified for only a few phytoplasma diseases, restricting control strategies. Understanding transmission by these Hemiptera limits disease management in affected plants. Research emphasizes ecological and molecular interactions for better interventions.
What methods are used to study phytoplasma genomes?
Genome sequencing targets phytoplasmas and their insect symbionts, including endocellular bacteria in vectors. Tools like BRAKER2 annotate eukaryotic and bacterial genomes using GeneMark-EP+ and AUGUSTUS. These approaches support molecular characterization of pathogen-vector interactions.
What plants are affected by phytoplasmas?
Phytoplasmas affect hundreds of commercial and native plants, with citrus prominently impacted by Huanglongbing. Vectors transmit pathogens through phloem, causing extensive damage. Studies focus on crops like citrus and interactions with Hemiptera vectors.
Open Research Questions
- ? How can transmission efficiency of phytoplasmas by specific Hemiptera vectors be quantitatively modeled?
- ? What molecular mechanisms enable phytoplasmas to persist in diverse Hemiptera insect vectors?
- ? Which unclassified phytoplasma strains from new host plants fit into existing 16Sr groups?
- ? How do endosymbionts in Hemiptera vectors influence phytoplasma acquisition and inoculation?
- ? What are the latent periods and host preferences for leafhoppers, planthoppers, and psyllids transmitting phytoplasmas?
Recent Trends
The field maintains 65,761 works with steady output in plant-pathogen-insect interactions, emphasizing genome sequencing and vector studies.
High-citation papers like "INSECT VECTORS OF PHYTOPLASMAS" (Weintraub and Beanland, 2005, 1039 citations) and "Revised Classification Scheme of Phytoplasmas" (Lee et al., 1998, 1037 citations) anchor ongoing classification and transmission research.
No recent preprints or news reported in the last 12 months.
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