Sugarcane white leaf (SGWL) disease is associated with phytoplasmas and transmitted by the leafhopper Matsumuratettix hiroglyphicus
(Matsumura). The objective of this study was to identify bacteria symbiont in this leafhopper to use for future research
of symbiotic control development. The leafhoppers were collected from six different sugarcane fields in Thailand. Bacteria were
identified by using PCR with a universal primer pair on 16S rRNA gene, cloning, sequencing and blast searches. Two main types
of bacteria were found, the first group show 94-98% homology with the primary endosymbiont ‘Candidatus Sulcia muelleri’
(phylum Bacteroidetes-class Flavobacteria), which has been reported in the suborder Auchenorrhyncha. The second group was
not closely matched with any sequences in the database. This group was predominant in the leafhopper and found in all specimens
examined, so it was the selected bacteria. This bacterial symbiont was tested for location in the leafhopper body by specific PCR
and it was prevalent in the same organs with SCWL phytoplasma, but not in salivary gland. Furthermore, this bacterial symbiont
was found in all developmental stages of the insect vector including eggs, nymphs and adults of M. hiroglyphicus. We speculate
that this bacterial symbiont might have a mutualistic relation with insect host. These results are the first report of bacterial symbionts
in the leafhopper vector of SCWL disease and it is useful information for future research of symbiotic control development or
for examining relationship between bacterial symbionts and leafhopper host.
Sugarcane white leaf (SGWL) disease is associated with phytoplasmas and transmitted by the leafhopper Matsumuratettix hiroglyphicus(Matsumura). The objective of this study was to identify bacteria symbiont in this leafhopper to use for future researchof symbiotic control development. The leafhoppers were collected from six different sugarcane fields in Thailand. Bacteria wereidentified by using PCR with a universal primer pair on 16S rRNA gene, cloning, sequencing and blast searches. Two main typesof bacteria were found, the first group show 94-98% homology with the primary endosymbiont ‘Candidatus Sulcia muelleri’(phylum Bacteroidetes-class Flavobacteria), which has been reported in the suborder Auchenorrhyncha. The second group wasnot closely matched with any sequences in the database. This group was predominant in the leafhopper and found in all specimensexamined, so it was the selected bacteria. This bacterial symbiont was tested for location in the leafhopper body by specific PCRand it was prevalent in the same organs with SCWL phytoplasma, but not in salivary gland. Furthermore, this bacterial symbiontwas found in all developmental stages of the insect vector including eggs, nymphs and adults of M. hiroglyphicus. We speculatethat this bacterial symbiont might have a mutualistic relation with insect host. These results are the first report of bacterial symbiontsin the leafhopper vector of SCWL disease and it is useful information for future research of symbiotic control development orfor examining relationship between bacterial symbionts and leafhopper host.
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