Abstract
BACKGROUND: Phytoplasma, the causative agent of Bois Noir disease of grapevines, are vectored by the planthopper Hyalesthes obsoletus (Hemiptera: Cixiidae). A Dyella-like bacterium (DLB) isolated from H. obsoletus inhibits the growth of Spiroplasma melliferum, a cultivable relative of phytoplasma. Additional evidence suggests that DLB can reduce the symptoms of yellows disease in grapevine plantlets. The aim of this study was to test whether DLB could colonize a range of phytoplasma- and liberibacter-sensitive crop plants, and thus assess its potential agricultural use. RESULTS: Vitex agnus-castus, the preferred host plant of H. obsoletus was found to be a natural host of DLB, which was successfully introduced into a range of crop plants belonging to seven families. The most effective DLB application method was foliar spraying. Microscopy observation revealed that DLB aggregated on the leaf surface and around the stomata, suggesting that this is its route of entry. DLB was also present in the vascular tissues of plants, indicating that it moved systemically through the plant. CONCLUSIONS: DLB is a potential biocontrol agent and its broad spectrum of host plants indicates the possibility of its future use against a range of diseases caused by phloem-limited bacteria. © 2017 Society of Chemical Industry.
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Claims 7
Claim · model-written summary
Vitex agnus-castus was a natural host of DLB.
- Taxon
- Vitex agnus-castus
.jpg?width=60)
Vitex agnus-castuse0 - Interactor
- DLBe0biocontrol_agent
- Outcome
- natural host of DLBe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Vitex agnus-castus, the preferred host plant of H. obsoletus was found to be a natural host of DLB”
Claim · model-written summary
DLB was introduced into crop plants from seven families.
Verbatim
e0“DLB, which was successfully introduced into a range of crop plants belonging to seven families”
Claim · model-written summary
Foliar spraying was the most effective DLB application method.
Verbatim
e0“The most effective DLB application method was foliar spraying”
t0“crop plants”
Claim · model-written summary
DLB aggregated on leaf surfaces and around stomata.
Verbatim
e0“DLB aggregated on the leaf surface and around the stomata”
t0“crop plants”
Claim · model-written summary
DLB was present in plant vascular tissues.
- Taxon
- plantsViridiplantaee0
- Interactor
- DLBe0biocontrol_agent
- Outcome
- DLB was also present in the vascular tissuese0
Verbatim
e0“DLB was also present in the vascular tissues of plants”
Claim · model-written summary
DLB presence in vascular tissues indicated systemic movement through the plant.
- Taxon
- plantsViridiplantaee0
- Interactor
- DLBe0biocontrol_agent
- Outcome
- moved systemically through the plante0
Verbatim
e0“DLB was also present in the vascular tissues of plants, indicating that it moved systemically through the plant”
Claim · model-written summary
The broad host range indicates possible future use of DLB against phloem-limited bacterial diseases.
Verbatim
e0“DLB is a potential biocontrol agent and its broad spectrum of host plants indicates the possibility of its future use against a range of diseases caused by phloem-limited bacteria”
t0“crop plants”