Xanthomonas hortorum pv. carotae (bacterial blight of carrot)

Osdaghi, Ebrahim

doi:10.1079/cabicompendium.56926

Cited by 1 publication

(2 citation statements)

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“…Although yield losses may occur in carrot fields with high incidences of bacterial blight, the economic impact of the disease is considered to be minimal in general. However, the highest seriousness of this pathogen is presented in regard to the seed quality [ 9 ]. Regarding the host resistance, a germplasm screening of carrot species indicated that four PI lines and two of the wild relatives are highly resistant against Xhc [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

“…In the case of Xhc, the International Seed Testing Association (ISTA) recommends a seed wash dilution-plating assay including washing seeds in buffer and plating serial dilutions of the extract on a semi-selective medium. Either a pathogenicity test or a polymerase chain reaction (PCR) is used to confirm suspect isolates [ 9 , 11 ]. In 2019, the gel-based PCR assay [ 12 ] was replaced by a TaqMan assay consisting of two pairs of Xhc specific primers and probes targeting specific markers Xhc3S and Xhc02 [ 13 , 14 ] and one set of universal primers and probe detecting a part of the 16S rRNA gene [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

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Management of bacterial blight of carrots by phenolic compounds treatment

Hakalová,

Tekielska,

Wohlmuth

et al. 2024

PLoS ONE

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Bacterial blight is a serious disease of carrot production worldwide. Under favorable conditions, the causal organism Xanthomonas hortorum pv. carotae causes serious loss especially in seed production because of its seed-borne character. Unlike fungal diseases, the treatment of bacterial diseases is limited and methods such as hot water or sodium hypochlorite (bleach) treatment are mainly used by seed companies. Here, we compared the efficacy of hot water treatment, sodium hypochlorite treatment and treatment with three phenolic compounds–carvacrol, thymol and eugenol, to eliminate Xanthomonas growth in vitro and subsequently in vivo on seeds of Xhc low, medium and highly infested carrot seed lots. The complete elimination of Xhc from germinated plants was obtained only for Xhc low infested seed lot with 1% sodium hypochlorite and carvacrol solutions in concentrations of 0.0196%– 0.313%. The significant reduction of Xhc presence in germinated plants of Xhc medium infested seed lot was achieved with 1% sodium hypochlorite treatment and hot water treatment. However, hot water treatment resulted in a significant reduction of seed germination percentage as well. Considering the elimination of Xhc infection from germinated plants and the effect on seed germination and plant vigor, 0.0196% carvacrol solution was suggested as an alternative to 1% sodium hypochlorite treatment regarding additional costs related to the liquidation of used treated water and to hot water treatment that has been proved to be insufficient to obtain disease-free plants.

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Section: Introductionmentioning

confidence: 99%