Bacterial leaf spot, a new disease of lettuce in Quebec caused by Xanthomonas campestris pv. vitians

Toussaint, Vicky

doi:10.7202/706187ar

Cited by 26 publications

(17 citation statements)

References 10 publications

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“…Bacterial leaf spot of lettuce (Lactuca sativa L.), caused by Xanthomonas campestris pv. vitians, is an economically important disease of lettuce in the world (Barak et al, 2001;Patterson et al, 1986;Pennisi and Pane, 1990;Sahin, 2000;Sahin and Miller, 1997;Toussaint, 1999). A widespread and damaging outbreak of BLS in lettuce was first observed in Florida in the winter of 1992-93 (Pernezny et al,1995).…”

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confidence: 99%

“…Therefore, use of host-plant resistance is the most efficient and desirable method to manage BLS in lettuce. Different types of lettuce have been found to vary in response to BLS with romaine and butterhead being highly susceptible (Carisse et al, 2000;Pernezny et al, 1995;Toussaint, 1999). Among crisphead, green, and red leaf lettuce, relatively resistant cultivars were identified in field (Carisse et al, 2000) and greenhouse experiments (Sahin and Miller, 1997).…”

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A Novel Screening Method for Evaluation of Lettuce Germplasm for Bacterial Leaf Spot Resistance

Lu¹,

Raid²

2013

horts

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Bacterial leaf spot of lettuce, caused by Xanthomonas campestris pv. vitians, is a devastating disease of lettuce worldwide. Because there are no chemicals available for effective control of the disease, host-plant resistance is highly desirable to protect lettuce production. A new method for fast screening and accurate identification of bacterial leaf spot (BLS)-resistant lettuce has been developed in our laboratory. A total of 79 lettuce genotypes (69 germplasm lines and 10 adapted cultivars) were evaluated with this technique for response to X. c. vitians. Disease incidences ranged from 92% to 100% and disease severities were between 1.6 and 3.6 on the 0 to 4 scale. No highly resistant genotypes were identified. However, 12 genotypes did not significantly differ for disease severities from the moderately resistant ‘Little Gem’ lettuce that was used as a resistant control. Comparison of disease severities of 10 commercial cultivars and three moderately resistant germplasm lines tested at the seedling stage and adult stage showed a high positive correlation (r = 0.87, P < 0.0001) between tests. The new screening method should be useful in breeding programs, in which great numbers of plants need to be tested during germplasm evaluation, and for single plant selection as well as other studies. The identification of new sources of moderate resistance in this study could facilitate development of cultivars with a higher level of resistance through the gene pyramiding approach.

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A Novel Screening Method for Evaluation of Lettuce Germplasm for Bacterial Leaf Spot Resistance

Lu¹,

Raid²

2013

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“…One of them causes watersoaked, brown lesions that later turn black, and they are about 1 to 2 mm in diameter. These lesions have V-shape, are translucent and they collapse (Toussaint, 1999;Sahin and Miller, 1998). Lesions may expand along the veins of the plant (Sahin and Miller, 1997;Toussaint 1999;Wallis and Joubert, 1972).…”

Section: Introductionmentioning

confidence: 99%

“…These lesions have V-shape, are translucent and they collapse (Toussaint, 1999;Sahin and Miller, 1998). Lesions may expand along the veins of the plant (Sahin and Miller, 1997;Toussaint 1999;Wallis and Joubert, 1972). Another type of symptom consists of small black spots scattered along the leaf surface (Sahin and Miller, 1997).…”

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Acibenzolar-S-methyl induces lettuce resistance against Xanthomonas campestris pv. vitians

Fahri¹

2011

Afr. J. Biotechnol.

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Acibenzolar-S-methyl (Benzo [1,2,3] thiadiazole-7-carbothioic acidS methyl ester, ASM; Bion 50 WG) was found to be more protective for lettuce against bacterial speck disease caused by Xanthomonas campestris pv. vitians. The experiments were conducted under controlled climatic conditions in the greenhouse, and induction of defense mechanism using ASM treatment against challenged inoculation with X. campestris pv. vitians was studied. It was effective in reducing the severity of disease and bacterial growth when compared with control and copper hydroxide. Pathogen growth was also followed with specific PCR before the typical symptom development on leaf tissues. Equal plant tissues collected from infected pnjm, lants were used in order to compare different treatments and pathogen invasion. The induction interval (48) before inoculation period was convenient for the control of pathogen by ASM treatment. The findings show that ASM treatment in inoculated plants has long lasting effect to induce defense-related enzymes, contributing to the enhancement of plant resistance. The effect was comparable with copper treatment. As a marker of resistance, PR protein activity chitinase showed remarkable increase, depending on decreasing bacterial growth in planta.

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“…Xcv can be transmitted by lettuce plant debris in soil or leaves of symptomless weed species after the summer and winter fallow periods in California (Barak et al, 2001). Xcv has also been demonstrated to be spread rapidly by overhead irrigation in greenhouse from only a few infected plants (Toussaint, 1999). A broad list of potential host plant species has been provided after inoculation of these plants with Xcv (Tsuchiya et al, 1981).…”

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Diverse Responses of Lettuce Cultivars and Germplasm Lines to Infections of Three Isolates of Xanthomonas campestris pv. vitians

Wang

Raid

et al. 2015

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Bacterial leaf spot (BLS) disease, caused by Xanthomonas campestris pv. vitians (Xcv) has become an increasingly damaging disease in the lettuce production areas of the United States. To understand the nature of the outbreaks of this disease, the pathogenic variations for causing disease were evaluated on 29 lettuce cultivars and germplasm lines using three Xcv isolates recovered in different years from the Everglades Agriculture Area (EAA) of Florida. Significant differences were shown in both the BLS incidences and disease severities among the three Xcv isolates, and the rank from high virulence to less severity was L7 > JF196 > NF1. Our results suggest that the pathogenic variations of the isolates may have been associated with the epidemic outbreaks of BLS in EAA. Among the 29 lettuce genotypes, the host plant resistance was characterized by specific host genotype and Xcv isolate interactions. The leaf lettuce PI358001-1 was consistently in the high resistant category to all three Xcv isolates, and is a promising resistant source for development of resistant cultivars.

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Bacterial leaf spot, a new disease of lettuce in Quebec caused by Xanthomonas campestris pv. vitians

Cited by 26 publications

References 10 publications

A Novel Screening Method for Evaluation of Lettuce Germplasm for Bacterial Leaf Spot Resistance

A Novel Screening Method for Evaluation of Lettuce Germplasm for Bacterial Leaf Spot Resistance

Acibenzolar-S-methyl induces lettuce resistance against Xanthomonas campestris pv. vitians

Diverse Responses of Lettuce Cultivars and Germplasm Lines to Infections of Three Isolates of Xanthomonas campestris pv. vitians

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