Periwinkle leaf spots and stem lesions caused by Xanthomonas campestris

Basavand, Esmaeil; Firouzianbandpey, Saman; Rahimian, Heshmatollah

doi:10.1007/s10658-022-02534-6

Cited by 2 publications

(2 citation statements)

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“…Angular leaf spot has been observed throughout the three northern provinces in recent years, although its incidence has been far less and limited mainly to Mazandaran in the early years of its identification (Rahimian, 1989).…”

Section: Discussionmentioning

confidence: 99%

“…In a concurrent report, an angular leaf spot disease of Caucasian alder (A. subcordata) trees caused by Xanthomonas sp. was observed in several locations in Mazandaran province (Rahimian, 1989). The disease is characterized by the appearance of brown to black angular necrotic leaf spots each surrounded by a yellow halo measuring 1-3 mm in diameter which could lead to defoliation and reduced photosynthetic potential (Figure 1).…”

Section: Introductionmentioning

confidence: 99%

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Angular leaf spot of Caucasian alder incited by a pathovar of Xanthomonas arboricola

Abbasi,

Rahimian,

Tajick‐Ghanbari

et al. 2024

Forest Pathology

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Caucasian alder (Alnus subcordata) is among the major constituents of the Hyrcanian forests extending all along the southern coast of the Caspian Sea in northern Iran. An angular leaf spot with a yellowish chlorotic halo has attained a widespread occurrence throughout the forest and suburban areas of the northern provinces including Guilan, Mazandaran and Golestan. Strains of a Xanthomonas sp. were consistently isolated from the symptomatic leaves of A. subcordata. Colonies of the isolates were yellow circular, convex and mucoid on nutrient agar containing glucose or sucrose. In multilocus sequence analysis using the genes gyrB, rpoD, dnaK, gltA, fyuA and gapA, the representative isolates occupied a clade shared by the known pathovars of Xanthomonas arboricola. The isolates were relatively heterogeneous phenotypically, but more so in their rep‐PCR fingerprints. Pathogenicity of several isolates was confirmed on seedlings of A. subcordata and Alnus rhombifolia, whereas Alnus cordata, Alnus glutinosa and Alnus crispa appeared not to be susceptible. Based on these characteristics, the isolates causing angular leaf spots of Caucasian alder appear to represent a novel pathovar of X. arboricola.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%