Agressividade de linhagens de Xanthomonas axonopodis pv. aurantifolii Tipo C em lima ácida 'Galego'

Nociti, Letícia Ane Sizuki; Camargo, Margarete; Neto, J. Rodrigues; Francischini, Fabrício J. B.; Belasque, José

doi:10.1590/s0100-41582006000200003

Cited by 6 publications

(4 citation statements)

References 9 publications

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“…citri under field conditions; they reported differences among genotypes. Nociti et al [21] also used AUDPC to assess the aggressiveness of strains of X. axonopodis pv. aurantifolii towards 'Mexican' lime; they found two groups in terms of relative aggressiveness.…”

Section: Discussionmentioning

confidence: 99%

Temporal Analysis of Bacterial Leaf Blight in Clonal Eucalyptus Plantations in Brazil

Oliveira

Fernandes

Junior

et al. 2019

Forests

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Bacterial leaf blight is an important disease in Eucalyptus spp. plantations since it can cause defoliation, affecting plant development. A better understanding of the disease epidemiology is important for its control. Thus, the aim of this study was to analyze bacterial leaf blight temporal progress in the initial establishment in the field of different eucalyptus clones. It also targeted to correlate the incidence and area under the disease-progress curve (AUDPC), with variables related to growth and meteorological data. Bacterial leaf blight progress curves were analyzed based on incidence and carried out AUDPC calculation. Pearson’s coefficient was used to verify the correlations between bacterial leaf blight incidence and AUDPC with clone initial growth and meteorological factors. Gompertz or Logistic models were the best adjustment to data, according to the assessed clones. A difference in AUDPC was observed between clones regarding bacterial leaf blight incidence during the assessment period. Clones were divided into three groups with different tolerance levels. A negative correlation was observed between bacterial leaf blight incidence, AUDPC, and growth variables of clones. During the assessment period, average air temperature, rainfall, and air relative humidity favored disease incidence. The clones A469, VM01, and 373 were the most tolerant to the disease.

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Section: Discussionmentioning

confidence: 99%

Temporal Analysis of Bacterial Leaf Blight in Clonal Eucalyptus Plantations in Brazil

Oliveira

Fernandes

Junior

et al. 2019

Forests

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“…According to Nociti et al . (), the brown‐pigmented Xfa‐C isolates are more aggressive on Key lime than Xfa‐C isolates that do not produce the brown pigment.…”

Section: Introductionmentioning

confidence: 90%

“…In 1999 a variant of Xfa-C that produces a brown pigment in solid media was isolated in Sao Paulo. According to Nociti et al (2006), the brown-pigmented Xfa-C isolates are more aggressive on Key lime than Xfa-C isolates that do not produce the brown pigment.…”

Section: Introductionmentioning

confidence: 99%

A functional XopAG homologue in Xanthomonas fuscans pv. aurantifolii strain C limits host range

et al. 2015

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Citrus canker is caused by two Xanthomonas species, Xanthomonas citri, which has become the primary pathogen where citrus canker occurs (type A citrus canker, Xc‐A), and X. fuscans pv. aurantifolii (Xfa), which consists of strains B and C. The B strain is less pathogenic than the A strain, but produces symptoms in all citrus species. The C‐type cankers only infect Key lime (Citrus aurantifolia) and produce a hypersensitive reaction (HR) in grapefruit (Citrus paradisi) leaves. An avirulence gene, avrGf2, was identified in a C strain that was responsible for the HR in grapefruit. AvrGf2 is a member of XopAG effector family and shares 45% identity at amino acid level with another member of the same family, AvrGf1 from strain Xc‐Aw, which was previously shown to elicit an HR in grapefruit. AvrGf2 shares sequence identity with other XopAG effectors present in Xanthomonas vasculorum, Xanthomonas campestris pv. musacearum and Pseudomonas syringae pv. tomato. Mutagenesis of avrGf2 in C strain resulted in a compatible reaction in grapefruit. There was no observable effect on virulence when Xc‐A transconjugants containing either avirulence gene were inoculated on Key lime. Expression of avrGf1 or avrGf2 in Xc‐A resulted in a similar phenotype following infiltration into grapefruit leaves, although the avrGf2 transconjugant elicited a faster HR and lower populations than the transconjugant containing avrGf1. Also, it was shown that all Xfa‐B strains tested contain a transposon in avrGf2 that helps to explain the differences in host range between B and C strains.

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“…The C strain was never found in Argentina or anywhere else. Interestingly, some type C strains are able to produce a dark pigment when grown in culture medium (Nociti et al 2006). Very few other species of Xanthomonas present this characteristic (Schaad et al 2005).…”

Section: Xanthomonas Citri Pv Aurantifolii (Types B and C)mentioning

confidence: 99%

Diversity and copper resistance of Xanthomonas affecting citrus

Behlau

Gochez

Jones

2020

Trop. plant pathol.

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Since citrus canker was first described in the early 1900's, four major types and three species of pathogenic xanthomonads associated to citrus were identified based on the characteristic symptoms and host range. Type A, caused by X. citri subsp. citri, develops typical raised cankered lesions and is pathogenic on most commercial citrus species and cultivars. Types B and C are caused by X. citri pv. aurantifolii which elicits canker lesions. Besides the typical type A, the more aggressive and most widely spread type, other subtypes have been described, such as type A*, type A w , type A-Manatee, type A-Miami, type A-minus pthA, and type-A etrog. The type B strains are found only in Argentina and are more pathogenic on lemon and less aggressive on sweet orange, tangerines and grapefruit. The type C strains are found only in Brazil and are pathogenic only on Key lime. X. alfalfae subsp. citrumelonis, formerly known as type E, causes citrus bacterial spot and is more aggressive on trifoliate citrus and its hybrids. Lesions caused by citrus bacterial spot are flat or sunken and not raised. Several subtypes of X. citri subsp. citri have also been identified. Besides the differences in pathogenicity, xanthomonads may also vary in their sensitivity to copper. Copper resistance has been reported for strains of X. citri subsp. citri and X. alfalfae subsp. citrumelonis and is conferred by the gene clusters copLAB or copABCD. Resistance to copper has serious implications for the use of copper-based bactericides, which are the most important chemicals for the control of diseases caused by Xanthomonas on citrus. Keywords Citrus bacterial spot. Citrus canker. Xanthomonas alfalfae subsp. citrumelonis. X. citri pv. aurantifolii. X. citri subsp. citri. copABCD. copLAB

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Agressividade de linhagens de Xanthomonas axonopodis pv. aurantifolii Tipo C em lima ácida 'Galego'

Cited by 6 publications

References 9 publications

Temporal Analysis of Bacterial Leaf Blight in Clonal Eucalyptus Plantations in Brazil

Temporal Analysis of Bacterial Leaf Blight in Clonal Eucalyptus Plantations in Brazil

A functional XopAG homologue in Xanthomonas fuscans pv. aurantifolii strain C limits host range

Diversity and copper resistance of Xanthomonas affecting citrus

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