Monitoring virulence and sexual compatibility in Brazilian Bremia lactucae populations

2021 ◽  
Author(s):  
Larissa N. Souza ◽  
Marcus V. Marin ◽  
Carolina A. Franco ◽  
Edgard H. C. Silva ◽  
Carlos H. Caprio ◽  
...  
Keyword(s):  
Bremia Lactucae ◽  
Sexual Compatibility

Sexual compatibility types of Bremia lactucae isolates originating from Lactuca serriola

1990 ◽  
Vol 96 (1) ◽  
pp. 51-54 ◽  
Author(s):  
Aleš Lebeda ◽  
Ida Blok
Keyword(s):  
Bremia Lactucae ◽  
Lactuca Serriola ◽  
Sexual Compatibility

scholarly journals Mutants of downy mildew resistance in Lactuca sativa (lettuce).

Genetics ◽  
1994 ◽  
Vol 137 (3) ◽  
pp. 867-874
Author(s):  
P A Okubara ◽  
P A Anderson ◽  
O E Ochoa ◽  
R W Michelmore
Keyword(s):  
Molecular Marker ◽  
Downy Mildew ◽  
Genomic Dna ◽  
Spontaneous Mutation ◽  
Multigene Families ◽  
Downy Mildew Resistance ◽  
Bremia Lactucae ◽  
Wild Type ◽  
Mildew Resistance ◽  
Recessive Mutations

Abstract As part of our investigation of disease resistance in lettuce, we generated mutants that have lost resistance to Bremia lactucae, the casual fungus of downy mildew. Using a rapid and reliable screen, we identified 16 distinct mutants of Latuca sativa that have lost activity of one of four different downy mildew resistance genes (Dm). In all mutants, only a single Dm specificity was affected. Genetic analysis indicated that the lesions segregated as single, recessive mutations at the Dm loci. Dm3 was inactivated in nine of the mutants. One of five Dm 1 mutants was selected from a population of untreated seeds and therefore carried a spontaneous mutation. All other Dm1, Dm3, Dm5/8 and Dm7 mutants were derived from gamma- or fast neutron-irradiated seed. In two separate Dm 1 mutants and in each of the eight Dm3 mutants analyzed, at least one closely linked molecular marker was absent. Also, high molecular weight genomic DNA fragments that hybridized to a tightly linked molecular marker in wild type were either missing entirely or were truncated in two of the Dm3 mutants, providing additional evidence that deletions had occurred in these mutants. Absence of mutations at loci epistatic to the Dm genes suggested that such loci were either members of multigene families, were critical for plant survival, or encoded components of duplicated pathways for resistance; alternatively, the genes determining downy mildew resistance might be limited to the Dm loci.

Sexual compatibility in giant kelp gametophytes: inter-cultivar hybridization is average between parents but excels under harsher conditions

2021 ◽  
Author(s):  
Pedro Murúa ◽  
David J. Patiño ◽  
Dieter G. Müller ◽  
Renato Westermeier
Keyword(s):  
Giant Kelp ◽  
Sexual Compatibility

Genetic analysis of factors for resistance to downy mildew (Bremia lactucae) in species of lettuce (Lactuca sativa and L. serriola)

1987 ◽  
Vol 36 (4) ◽  
pp. 499-514 ◽  
Author(s):  
B. F. FARRARA ◽  
T. W. ILOTT ◽  
R. W. MICHELMORE
Keyword(s):  
Genetic Analysis ◽  
Downy Mildew ◽  
Lactuca Sativa ◽  
Bremia Lactucae

Virulence characteristics of Bremia lactucae populations in Norway

2014 ◽  
Vol 139 (4) ◽  
pp. 679-686 ◽  
Author(s):  
Berit Nordskog ◽  
Abdelhameed Elameen ◽  
David M. Gadoury ◽  
Arne Hermansen
Keyword(s):  
Bremia Lactucae

Oospores of Bremia lactucae

1974 ◽  
Vol 62 (1) ◽  
pp. 145-IN6 ◽  
Author(s):  
I.C. Tommerup ◽  
D.S. Ingram ◽  
J.A. Sargent
Keyword(s):  
Bremia Lactucae

Sexual compatibility and its associated factors among heterosexual couples: a systemic review

2021 ◽  
pp. 1-18
Author(s):  
Elahe Ahmadnia ◽  
Tayebe Ziaei ◽  
Masud Yunesian ◽  
Arezoo Haseli ◽  
Ali Mohammad Nazari ◽  
...  
Keyword(s):  
Associated Factors ◽  
Systemic Review ◽  
Heterosexual Couples ◽  
Sexual Compatibility

Infection of lettuce by oospores of Bremia lactucae

1983 ◽  
Vol 81 (1) ◽  
pp. 144-147 ◽  
Author(s):  
Judith M. Norwood ◽  
I.R. Crute
Keyword(s):  
Bremia Lactucae

scholarly journals Identification of new Bremia lactucae races in lettuce in São Paulo state

2012 ◽  
Vol 30 (2) ◽  
pp. 209-213 ◽  
Author(s):  
Renata Castoldi ◽  
Hamilton César de O Charlo ◽  
Tagli Dalpian ◽  
Danilo M Melo ◽  
Adelita P Botelho ◽  
...  
Keyword(s):  
Downy Mildew ◽  
Sao Paulo ◽  
Leafy Vegetable ◽  
Susceptible Cultivar ◽  
São Paulo ◽  
Bremia Lactucae ◽  
Paulo State ◽  
São Paulo State

Lettuce is the most consumed leafy vegetable in Brazil. However, its production has faced increasing difficulties mainly due to the infestation of producing areas with Bremia lactucae, the causing agent of downy mildew, the worst disease in lettuce. The aim of this study was to identify B. lactucae races occurring in lettuce producing areas of São Paulo state, during 2008 and 2009. Lettuce leaf samples containing B. lactucae sporangia were collected in the major lettuce producing areas of São Paulo. Each sample was considered an isolate. After the multiplication of sporangia in the susceptible cultivar Solaris, with subsequent inoculation in the differentiating cultivars, the evaluations were performed on the same day of the first sporulation in the susceptible cultivar 'Cobham Green (DM 0)'. In 2008 one new B. lactucae code was identified. SPBl:05 was the denomination proposed to it. In 2009 one another B. lactucae code was identified, that is, 63/63/02/00, whose denomination was proposed to be SPBl:06.

scholarly journals Effector-mediated discovery of a novel resistance gene against Bremia lactucae in a nonhost lettuce species

2017 ◽  
Vol 216 (3) ◽  
pp. 915-926 ◽  
Author(s):  
Anne K. J. Giesbers ◽  
Alexandra J. E. Pelgrom ◽  
Richard G. F. Visser ◽  
Rients E. Niks ◽  
Guido Van den Ackerveken ◽  
...  
Keyword(s):  
Resistance Gene ◽  
Bremia Lactucae
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