Molecular characterization of ‘Candidatus Liberibacter' species/strains causing huanglongbing disease of citrus in Kenya

Magomere, Titus; Obukosia, Silas D.; Mutitu, Eunice; Ngichabe, Christopher; Olubayo, Florence; Shibairo, Solomon I.

doi:10.2225/vol12-issue2-fulltext-2

Cited by 17 publications

(8 citation statements)

References 31 publications

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“…Although in this case, the number of fruits·m -2 remained very similar between the trees that were asymptomatic and those with 10 to 50 % of the canopy affected by HLB, a strong yield reduction was observed in trees with symptoms in more than 50 % of their canopy (Figure 2b). Magomere et al (2009) reported that it is difficult to obtain an accurate assessment of yield losses caused by HLB disease, but infected branches produce little or no commercial fruits. In this study the whole trees were sampled, whether their branches were affected by the disease or not.…”

Section: Yield In Outdoor Treesmentioning

confidence: 99%

“…Magomere et al (2009) señalan que en los cítricos de Kenya, las ramas infectadas produjeron poco o nada de fruta comercial y que además se registraron pérdidas en rendimiento del 100 %.…”

Section: Introductionunclassified

“…Magomere et al (2009) reported that in Kenya, the infected branches of citrus trees produced little or no commercial fruit and 100 % yield losses were recorded.…”

Section: Introductionmentioning

confidence: 99%

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Huanglongbing (HLB) DISEASE IN mexican lime TREES [Citrus aurantifolia (Christm) Swingle] and its dispersion in Colima state , MEXICO

Robles-González

Velázquez-Monreal

Manzanilla-Ramírez

et al. 2013

rchsh

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Section: Yield In Outdoor Treesmentioning

confidence: 99%

Section: Introductionunclassified

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Huanglongbing (HLB) DISEASE IN mexican lime TREES [Citrus aurantifolia (Christm) Swingle] and its dispersion in Colima state , MEXICO

Robles-González

Velázquez-Monreal

Manzanilla-Ramírez

et al. 2013

rchsh

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“…In "Candidatus Liberibacter africanus" (Laf), somewhat greater differences suggested a subspecies with host plant separation (Garnier et al 2000). SNP differences were used to indicate variation in samples of Laf from Kenya and South Africa (Magomere et al 2009). Analysis of genetic variability in various accessions of "Candidatus Liberibacter asiaticus" (Las) indicated a geographically-based range of variants, although no differences in phenotype were noted (Adkar-Purushothama et al 2009;Bastianel et al 2005;Ding et al 2009;Furuya et al 2010), however some degree of plant host specificity is suggested (Khairulmazmi et al 2009).…”

mentioning

confidence: 99%

Haplotypes of “Candidatus Liberibacter solanacearum” suggest long-standing separation

Nelson

Fisher²,

Munyaneza³

2011

Eur J Plant Pathol

124

119

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Three haplotypes of the recently discovered bacterium species "Candidatus Liberibacter solanacearum" are described and related to geographic ranges. The first two are associated with Zebra Chip/Psyllid Yellows of potatoes and other solanaceous plants, vectored by the tomato/potato psyllid Bactericera cockerelli in North and Central America and New Zealand. The third is associated with diseased carrots in Finland and vectored by the carrot psyllid Trioza apicalis. The haplotypes are described by SNPs on the 16s rRNA, 16s/23s ISR and 50s rplJ and rplL ribosomal protein genes. These SNPs are inherited as a package across the three genes. Haplotype "a" has been found primarily from Honduras and Guatemala through western Mexico to Arizona and California, and in New Zealand. Haplotype "b" is currently known from eastern Mexico and northwards through Texas to south central Washington. These haplotypes show some range overlap in Texas, Kansas and Nebraska. The haplotypes are not yet known to elicit biological differences in the plant or insect hosts. These apparently stable haplotypes suggest separate bacterial populations of long standing.

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“…Liberibacter africanus in Southern Africa and some East African countries, and Ca. Liberibacter americanus in Brazil (Bové 2006;Gottwald et al 2007;Mangomere et al 2009;Teixeira et al 2008). In the USA, the only species that has been found so far is Ca.…”

Section: Introductionmentioning

confidence: 99%

Relation between plant nutrition, hormones, insecticide applications, bacterial endophytes, and Candidatus Liberibacter Ct values in citrus trees infected with Huanglongbing

et al. 2013

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Intensive insecticide and nutrient management have been attempted worldwide to reduce citrus huanglongbing (HLB) symptom development and yield loss. However, effects of insecticide and nutrient applications on HLB have been poorly understood. Leaf nutrients, jasmonic and salicylic acid contents, cycle threshold (Ct) values of Ca. Liberibacter asiaticus (Las), and community structure of endophytic α-proteobacteria were evaluated after insecticide treatment, 'nutrition' treatment (including systemic resistance inducing agents), or both in comparison with a control in a two-factor field experiment in 2008-2012. Leaf N, Mn, Zn and B significantly increased whilst Cu decreased after nutrient applications. Salicylic acid significantly increased in old leaves treated with insecticides, nutrients or both, and in young leaves treated with nutrients only. The jasmonic acid concentration was highest after the nutrition treatment in both old and young leaves. Ct values of Las and leaf area and weight significantly increased after long-term nutrient applications in 2011 and/or 2012. Redundancy analysis of the endophytic α-proteobacteria community structure indicated that the communities were mainly separated according to nutrient applications, which were positively associated with Ct values of Las and Ca, Mn, Zn, B, Mg, and Fe contents in leaf samples collected in 2012. Thus, effects of insecticides on HLB were significant in the early 2-year period whilst nutrients had significant effects on Las content and leaf size and weight after at least 3 years of application.

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Molecular characterization of ‘Candidatus Liberibacter' species/strains causing huanglongbing disease of citrus in Kenya

Cited by 17 publications

References 31 publications

Huanglongbing (HLB) DISEASE IN mexican lime TREES [Citrus aurantifolia (Christm) Swingle] and its dispersion in Colima state , MEXICO

Huanglongbing (HLB) DISEASE IN mexican lime TREES [Citrus aurantifolia (Christm) Swingle] and its dispersion in Colima state , MEXICO

Haplotypes of “Candidatus Liberibacter solanacearum” suggest long-standing separation

Relation between plant nutrition, hormones, insecticide applications, bacterial endophytes, and Candidatus Liberibacter Ct values in citrus trees infected with Huanglongbing

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