Vegetative Compatibility and Pathogenicity of <i>Verticillium dahliae</i> Kleb. Isolates from Olive in Israel

Tsror, Leah; Levin, A. G.

doi:10.1046/j.1439-0434.2003.00749.x

Cited by 20 publications

(8 citation statements)

References 25 publications

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“…Currently, breeding programmes rely on natural infection of clones in trials to obtain information on disease susceptibility of future planting material. It has been shown that different VCGs can differ in their pathogenicity to hosts (Van Heerden and Wingfield 2001;Tsror Lahkim and Levin 2003;Elmer et al 1999). Although pathogenicity has not been linked to VCG types in this study, our results showed that a high diversity of VCGs exists outside South Africa.…”

Section: Discussioncontrasting

confidence: 50%

“…The high diversity observed in Mozambican and Namibian populations suggests that the centre of diversity of Chr. It has been shown that different VCGs can differ in their pathogenicity to hosts (Van Heerden and Wingfield 2001;Tsror Lahkim and Levin 2003;Elmer et al 1999). This is further supported by the high diversity for the Mozambique population from both native S. cordatum and non-native Eucalyptus species.…”

Section: Discussionmentioning

confidence: 78%

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Population structure of Chrysoporthe austroafricana in southern Africa determined using Vegetative Compatibility Groups (VCGs)

et al. 2012

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Chrysoporthe austroafricana is one of the most damaging pathogens of Eucalyptus trees in southern Africa. It also occurs on non-native Tibouchina granulosa trees and native Syzygium species. Additional isolates of the pathogen from previously unstudied countries in the region have become available from survey studies. The aim of this study was to use VCGs to consider the diversity in populations of isolates collected in various countries in southern Africa (Malawi, Mozambique, Namibia, South Africa and Zambia) and from different hosts. We also wanted to determine whether there are shared VCGs among these countries and hosts in southern Africa and establish a VCG tester strain database. Results showed a high diversity amongst isolates from different countries and hosts, but suggested little movement of VCGs among countries or hosts based on the available isolates. A total of 108 VCG tester strains were identified for southern Africa.

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Section: Discussioncontrasting

confidence: 50%

Section: Discussionmentioning

confidence: 78%

Population structure of Chrysoporthe austroafricana in southern Africa determined using Vegetative Compatibility Groups (VCGs)

et al. 2012

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“…However, there is no evidence regarding the number of mutated loci that govern both phenotypes in C. coffeicola. Therefore, we followed the terminology proposed by Correll et al (9), and widely accepted in the research with nit mutants (6,19,33). Considering the types of mutants identified, the greatest success in complementation tests is in pairings between nit1 or nit3 with NitM mutants (6,9,33,34), so we searched for these mutants.…”

Section: Discussionmentioning

confidence: 99%

Genetic Variability of Cercospora coffeicola from Organic and Conventional Coffee Plantings, Characterized by Vegetative Compatibility

Martins¹,

Maffia²,

Mizubuti³

2008

Phytopathology®

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Cercospora leaf spot is a destructive fungal disease that has become a threat to the coffee industry in Brazil. Nevertheless, little is known about populations of its causal agent, Cercospora coffeicola. We evaluated the potential of using nitrogen-nonutilizing (nit) mutants and vegetative compatibility groups (VCGs) to characterize the genetic variability of the C. coffeicola population associated with coffee plantings in Minas Gerais state (MG), Brazil. A total of 90 monosporic isolates were obtained from samples collected according to a hierarchical sampling scheme: (i) state geographical regions (Sul, Mata, and Triângulo), and (ii) production systems (conventional and organic). Nit mutants were obtained and 28 VCGs were identified. The 10 largest VCGs included 72.31% of all isolates, whereas each of the remaining 18 VCGs included 1.54% of the isolates. Isolates of the largest VCGs were found in the three regions sampled. Based on the frequencies of VCGs at each sampled level, we estimated the Shannon diversity index, as well as its richness and evenness components. Genetic variability was high at all hierarchical levels, and a high number of VCGs was found in populations of C. coffeicola associated with both conventional and organic coffee plantings.

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“…Verticillium dahliae isolate (no. 27, which was originally isolated from an infected olive tree, and assigned as VCG 2A) (Tsror (Lahkim) and Levin, 2003) was chosen due to its apparent aggressiveness in the field. It was cultured on potato dextrose agar (PDA) petri dishes for 4 days at 27°C.…”

Section: Methodsmentioning

confidence: 99%

“…The susceptibility of five olive cultivars (Barnea, Frantoio, Picual, Arbequina, and Manzanillo) to V. dahliae was tested under in vitro conditions, using stem cuttings. Senescence symptoms that are correlated to those obtained on trees in the orchard (Tsror (Lahkim) and Levin, 2003), were evaluated once a week on a scale of 0 to 4, where 0 = no symptoms, 1 = up 50% of the leaves roll in, 2 = more than 50% of the leaves roll in and some are desiccated, 3 = up 95% of the leaves desiccated, and 4 = completely dry leaves or defoliation. The data used for the statistical analysis, were recorded 3 weeks after the beginning of the experiment.…”

Section: Methodsmentioning

confidence: 99%

The Influence Of Salinity On Verticillium dahliae In Stem Cuttings Of Five Olive Cultivars

Levin¹,

Lavee²,

Tsror³

2007

Journal of Phytopathology

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Verticillium dahliae represents one of the main limiting factors in olive production in the Mediterranean countries. Increasing shortage of fresh water and land, increase the pressure on using alternative sources of marginal or saline water, and land previously cropped with V. dahliae host plants. The objective of the present study was to evaluate the influence of salinity on V. dahliae expression in olive stem cuttings. V. dahliae-inoculated cuttings of cvs. Picual, Frantoio, Mansanillo and Barnea, showed higher senescence symptoms than their non-inoculated controls. Colonization levels obtained in cv. Picual were significantly higher than in cv. Frantoio. Manzanillo was the most sensitive cultivar to salinity alone, with significant senescence symptoms in 4 and 6 dS/m NaCl treatments. When cv. Manzanillo was exposed to both salinity and V. dahliae, significantly higher senescence symptoms were obtained as compared with each of them separately. Senescence symptoms of cv. Picual exposed to V. dahliae, whether or not in combination with saline solutions, were significantly higher than those when cuttings were exposed to a saline solution alone. In cv. Frantoio, which is more resistant to salinity than the other cultivars, significantly high senescence symptoms were observed only in combination of V. dahliae and high saline concentration (8 dS/m). The fungal colonization index in cv. Manzanillo in high salinity (8 dS/m) was significantly higher than in the treatment without salt. In cv. Barnea, colonization index in 8 dS/m salinity was significantly higher than in the 4 dS/m concentration or control (fresh water). In conclusion, our findings demonstrate the interaction between V. dahliae and saline irrigation in various cultivars. Thus, stem cuttings could serve as an effective screening method in breeding olive clones for V. dahliae resistance, salt tolerance and their interaction.

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Vegetative Compatibility and Pathogenicity of Verticillium dahliae Kleb. Isolates from Olive in Israel

Cited by 20 publications

References 25 publications

Population structure of Chrysoporthe austroafricana in southern Africa determined using Vegetative Compatibility Groups (VCGs)

Population structure of Chrysoporthe austroafricana in southern Africa determined using Vegetative Compatibility Groups (VCGs)

Genetic Variability of Cercospora coffeicola from Organic and Conventional Coffee Plantings, Characterized by Vegetative Compatibility

The Influence Of Salinity On Verticillium dahliae In Stem Cuttings Of Five Olive Cultivars

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