scholarly journals Genome Sequence Resource of ‘Candidatus Liberibacter asiaticus’ from Diaphorina citri Kuwayama (Hemiptera: Liviidae) from La Réunion

Plant Disease ◽  
2020 ◽  
Author(s):  
Jinming Lu ◽  
Hélène Delatte ◽  
Bernard Reynaud ◽  
George Andrew Charles Beattie ◽  
Paul Holford ◽  
...  
Keyword(s):  
Genome Sequence ◽  
Whole Genome Sequence ◽  
Insect Vector ◽  
Whole Genome ◽  
Diaphorina Citri ◽  
La Réunion ◽  
Candidatus Liberibacter Asiaticus ◽  
Introduction Pathway ◽  
Candidatus Liberibacter ◽  
Liberibacter Asiaticus

‘Candidatus Liberibacter asiaticus’ (CLas) is an insect-transmitted, phloem-restricted α-proteobacterium associated with huanglongbing (HLB). Here, we provide the whole genome sequence of CLas strain, ReuSP1, from its insect vector Diaphorina citri (Hemiptera: Liviidae) collected in La Réunion. The genome is composed of 1,230,064 bp and has a 36.5% G+C content. This study reports the first CLas genome sequence from La Réunion, which will add to CLas genome resources and help elucidate our understanding of the introduction pathway into La Réunion.

scholarly journals Genome Sequence Resource of ‘Candidatus Liberibacter asiaticus’ from Diaphorina citri Kuwayama (Hemiptera: Liviidae) in Colombia

Plant Disease ◽  
2021 ◽  
Vol 105 (1) ◽  
pp. 193-195
Author(s):  
Yanjing Wang ◽  
Takumasa Kondo ◽  
Yurong He ◽  
Zhuohuai Zhou ◽  
Jinming Lu
Keyword(s):  
South America ◽  
Genome Sequence ◽  
Insect Vector ◽  
Diaphorina Citri ◽  
Candidatus Liberibacter Asiaticus ◽  
Introduction Pathway ◽  
Candidatus Liberibacter ◽  
Liberibacter Asiaticus

‘Candidatus Liberibacter asiaticus’ (CLas) is an unculturable phloem-restricted α-proteobacterium associated with huanglongbing (HLB). Here, we provide the genome sequence of CLas strain CoFLP1 from its insect vector Diaphorina citri (Hemiptera: Liviidae) collected in the department of La Guajira, Colombia. The CoFLP1 strain is composed of 1,231,639 bp with G+C 36.5% content. This study reports the first CLas genome sequence from Colombia, which will add to CLas genome resources and help to elucidate our understanding of the introduction pathway of HLB in South America.

scholarly journals Genome Sequence Resource of ‘Candidatus Liberibacter asiaticus’ strain 9PA From Brazil

Plant Disease ◽  
2021 ◽  
Vol 105 (1) ◽  
pp. 199-201
Author(s):  
P. A. Silva ◽  
J. Huang ◽  
N. A. Wulff ◽  
Z. Zheng ◽  
R. Krugner ◽  
...  
Keyword(s):  
Genome Sequence ◽  
Sweet Orange ◽  
Whole Genome Sequence ◽  
Whole Genome ◽  
Candidatus Liberibacter Asiaticus ◽  
Citrus Production ◽  
Candidatus Liberibacter ◽  
Citrus Huanglongbing ◽  
Liberibacter Asiaticus ◽  
And Control

‘Candidatus Liberibacter asiaticus’, an unculturable α-proteobacterium, is associated with citrus huanglongbing (HLB), a devastating disease threatening citrus production in Brazil and worldwide. In this study, a draft whole-genome sequence of ‘Ca. L. asiaticus’ strain 9PA from a sweet orange (cultivar Pera) tree collected in São Paulo State, Brazil, is reported. The 9PA genome is 1,231,881 bp, including two prophages, with G+C content of 36.7%. This is the first report of a whole-genome sequence of ‘Ca. L. asiaticus’ from Brazil or South America. The 9PA genome sequence will enrich ‘Ca. L. asiaticus’ genome resources and facilitate HLB research and control in Brazil and the world.

scholarly journals Enhancing PCR Capacity To Detect ‘Candidatus Liberibacter asiaticus’ Utilizing Whole Genome Sequence Information

Plant Disease ◽  
2020 ◽  
Vol 104 (2) ◽  
pp. 527-532 ◽  
Author(s):  
Minli Bao ◽  
Zheng Zheng ◽  
Xiaoan Sun ◽  
Jianchi Chen ◽  
Xiaoling Deng
Keyword(s):  
Genome Sequence ◽  
Biological Information ◽  
Whole Genome Sequence ◽  
Rrna Gene ◽  
Sequence Information ◽  
Whole Genome ◽  
Candidatus Liberibacter Asiaticus ◽  
Genomic Locus ◽  
Candidatus Liberibacter ◽  
Liberibacter Asiaticus

‘Candidatus Liberibacter asiaticus’ (CLas) is an unculturable α-proteobacterium associated with citrus Huanglongbing (HLB; yellow shoot disease). PCR procedures that accurately confirm or exclude CLas infection in citrus tissue/Asian citrus psyllid (ACP) samples are critical for HLB management. When CLas was described in 1994, a 23-bp signature oligonucleotide sequence (OI1) in the 16S rRNA gene (rrs, three genomic copies) was identified based on Sanger sequencing. OI1 contains single nucleotide polymorphisms (SNPs) distinguishing CLas from non-CLas species. The SNPs were used to design the primer HLBas, a key primer for a commonly used TaqMan PCR system (HLBas-PCR) for CLas detection. Recent developments in next-generation sequencing technology have led to the identification of 15 CLas whole genome sequence strains (WGSs). Analyses of CLas WGSs have generated a significant amount of biological information that could help to improve CLas detection. Utilizing the WGS information, this study re-evaluated the sequence integrity of OI1/HLBas and identified and/or confirmed a missing nucleotide G in the two primers. Replacement primers for OI1 and HLBas are proposed. At low cycle threshold (Ct) values (e.g., <30), HLBas-PCR remained reliable in CLas determination. At high Ct values (e.g., >30), HLBas-PCR alone was unreliable in differentiating whether samples contain low CLas titers or whether CLas is not present. The availability of ribonucleotide reductase (RNR)-PCR derived from the five-copy nrdB gene helped to resolve this problem. To further enhance low CLas titer detection, a 4CP-PCR system, based on a four-copy genomic locus, was developed. Evaluation of 107 HLB samples (94 citrus and 13 ACP) showed that 4CP-PCR was more sensitive than HLBas-PCR and shared similar sensitivity with RNR-PCR.

Probing the application of OmpA-derived peptides to disrupt the acquisition of ‘Candidatus Liberibacter asiaticus’ by Diaphorina citri

2021 ◽  
Author(s):  
Marcus Vinicius Merfa e Silva ◽  
Eduarda Regina Fischer ◽  
Mariana de Souza e Silva ◽  
Carolina Sardinha Francisco ◽  
Helvécio Coletta-Filho ◽  
...  
Keyword(s):  
Control Strategies ◽  
Insect Vector ◽  
Diaphorina Citri ◽  
Candidatus Liberibacter Asiaticus ◽  
In Planta ◽  
Host Interaction ◽  
Vector Population ◽  
Candidatus Liberibacter ◽  
Liberibacter Asiaticus ◽  
Bacterial Outer Membrane

Huanglongbing (HLB) is currently the most devastating disease of citrus worldwide. Both bacteria ‘Candidatus Liberibacter asiaticus’ (CLas) and ‘Ca. Liberibacter americanus’ (CLam) are associated with HLB in Brazil, but with a strong prevalence of CLas over CLam. Conventionally, HLB management focuses on controlling the insect vector population (Diaphorina citri; also known as Asian citrus psyllid – ACP) by spraying insecticides, an approach demonstrated to be mostly ineffective. Thus, development of novel more efficient HLB control strategies is required. The multifunctional bacterial outer membrane protein OmpA is involved in several molecular processes between bacteria and their hosts and has been suggested as a target for bacterial control. Curiously, OmpA is absent in CLam in comparison to CLas, suggesting a possible role on host-interaction. Therefore, in the current study, we have treated ACPs with different OmpA-derived peptides aiming to evaluate the acquisition of CLas by the insect vector. Treatment of psyllids with 5 µM of Pep1, Pep3, Pep5 and Pep6 in artificial diet significantly reduced the acquisition of CLas, while increasing the concentration of Pep5 and Pep6 to 50 µM abolished this process. In addition, in planta treatment with 50 µM of Pep6 also significantly decreased the acquisition of CLas and sweet orange plants stably absorbed and maintained this peptide for as long as three months post the final application. Together, our results demonstrate the promising use of OmpA-derived peptides as a novel biotechnological tool to control CLas.

scholarly journals Draft Whole-Genome Sequence of “Candidatus Liberibacter asiaticus” Strain TX2351 Isolated from Asian Citrus Psyllids in Texas, USA

2017 ◽  
Vol 5 (15) ◽  
Author(s):  
Madhurababu Kunta ◽  
Zheng Zheng ◽  
Fengnian Wu ◽  
John V. da Graca ◽  
Jong-Won Park ◽  
...  
Keyword(s):  
Genome Sequence ◽  
Draft Genome ◽  
South Texas ◽  
Open Reading Frames ◽  
Whole Genome Sequence ◽  
Candidatus Liberibacter Asiaticus ◽  
Candidatus Liberibacter ◽  
Liberibacter Asiaticus ◽  
Rna Genes ◽  
Reading Frames

ABSTRACT We report here the draft genome sequence of “Candidatus Liberibacter asiaticus” strain TX2351, collected from Asian citrus psyllids in south Texas, USA. The TX2351 genome has a size of 1,252,043 bp, a G+C content of 36.5%, 1,184 predicted open reading frames, and 52 RNA genes.

Prevalent transmission of 'Candidatus Liberibacter asiaticus’ over ‘Ca. Liberibacter americanus’ in a long-term controlled environment

2021 ◽  
Author(s):  
Maria Cândida de Godoy Gasparoto ◽  
Isabela Vescove Primiano ◽  
Renato Bassanezi ◽  
Silvia Afonseca Lourenço ◽  
Luiz Montesino ◽  
...  
Keyword(s):  
Sweet Orange ◽  
Insect Vector ◽  
Diaphorina Citri ◽  
Candidatus Liberibacter Asiaticus ◽  
Candidatus Liberibacter ◽  
Citrus Huanglongbing ◽  
Liberibacter Asiaticus ◽  
Citrus Orchards ◽  
Test Plants

In Brazil, citrus huanglongbing (HLB) is associated with ‘Candidatus Liberibacter americanus’ (CLam) and ‘Ca. Liberibacter asiaticus’ (CLas). However, there are few studies about HLB epidemiology when both Liberibacter spp. and its insect vector, the Asian citrus psyllid (ACP, Diaphorina citri), are present. The objective of this work was to compare the transmission of HLB by ACP when both CLam and CLas are present as primary inoculum. Two experiments were performed under screenhouse conditions from April 2008 to January 2012 (experiment 1) and from February 2011 to December 2015 (experiment 2). The experiments were carried out with sweet orange plants infected with CLam or CLas as inoculum source surrounded by sweet orange healthy plants. One hundred Liberibacter-free adult psyllids were monthly confined to the source of inoculum plants for 7 days with subsequent free movement inside the screenhouse. Fortnightly, nymphs and adults of psyllids were monitored. Psyllid and leaf samples were collected periodically for Liberibacter detection by PCR or qPCR. CLas was detected more frequently than CLam in both psyllid and leaf samples. No mixed infections were detected in the psyllids. A clear prevalence of CLas over CLam was observed in both experiments. The final HLB incidences were 16.7 and 14.5% of Liberibacter-positive test plants, and CLas was detected in 92.3 and 93.1% of these infected plants. Mixed infection was observed only in 3.8% of infected test plants in experiment 1. These results endorse the shift in the prevalence of CLam to CLas observed in citrus orchards of São Paulo, Brazil.

Sign in / Sign up

Export Citation Format

Share Document