molecular variation among isolates of verticillium dahliae and polymerase chain reaction-based differentiation of races.verticillium dahliae is a soilborne fungal pathogen that causes vascular wilt in a variety of economically important crops worldwide. there are two races of v. dahliae that infect tomato and lettuce. although race-1-specific resistance has been identified in both tomato and lettuce, no resistant sources are available for race 2. molecular analyses were employed to characterize the genetic variability and race structure of 101 isolates of v. dahliae from a variety of hosts, mainly from central an ...201020698756
population analyses of the vascular plant pathogen verticillium dahliae detect recombination and transcontinental gene flow.the fungal pathogen verticillium dahliae has resulted in significant losses in numerous crops in coastal california, but lettuce remained unaffected until the mid-1990s. since then outbreaks have decimated entire fields, but the causes of this sudden susceptibility of lettuce remain elusive. the population structure of v. dahliae isolated from coastal california (n=123) was investigated with 22 microsatellite markers, and compared with strains from tomato in central california (n=60), spinach se ...201020149887
verticillium dahliae race 2-specific pcr reveals a high frequency of race 2 strains in commercial spinach seed lots and delineates race structure.two pathogenic races of verticillium dahliae have been described on lettuce and tomato. host resistance to race 1 is governed by plant immune receptors that recognize the race 1-specific fungal effector ave1. only partial resistance to race 2 exists in lettuce. although polymerase chain reaction (pcr) assays are available to identify race 1, no complementary test exists to positively identify race 2, except for lengthy pathogenicity assays on host differentials. using the genome sequences of two ...201424502204
a review of control options and externalities for verticillium wilts.plant pathogens migrate to new regions through human activities such as trade, where they may establish themselves and cause disease on agriculturally important crops. verticillium wilt of lettuce, caused by verticillium dahliae, is a soilborne fungus that was introduced to coastal california via infested spinach seeds. it has caused significant losses for lettuce growers. once introduced, verticillium wilt could be managed by fumigating with methyl bromide and chloropicrin, but this option is n ...201728703041
sources of verticillium dahliae affecting lettuce.abstract since 1995, lettuce in coastal california, where more than half of the crop in north america is grown, has consistently suffered from severe outbreaks of verticillium wilt. the disease is confined to this region, although the pathogen (verticillium dahliae) and the host are present in other crop production regions in california. migration of the pathogen with infested spinach seed was previously documented, but the geographic sources of the pathogen, as well as the impact of lettuce see ...201222857515
Population biology of fungal plant pathogens.Studies of the population genetics of fungal and oomycetous phytopathogens are essential to clarifying the disease epidemiology and devising management strategies. Factors commonly associated with higher organisms such as migration, natural selection, or recombination, are critical for the building of a clearer picture of the pathogen in the landscape. In this chapter, we focus on a limited number of experimental and analytical methods that are commonly applied in population genetics. At first, ...201222183663
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