Development of molecular markers linked to the Leptosphaeria maculans resistance gene Rlm6 and inheritance of SCAR and CAPS markers in Brassica napus  × Brassica juncea interspecific hybrids

2018 ◽  
Vol 137 (3) ◽  
pp. 402-411 ◽  
Author(s):  
M. Harunur Rashid ◽  
Zhongwei Zou ◽  
W. G. Dilantha Fernando
Keyword(s):  
Molecular Markers ◽  
Brassica Napus ◽  
Resistance Gene ◽  
Brassica Juncea ◽  
Interspecific Hybrids ◽  
Leptosphaeria Maculans ◽  
Caps Markers

scholarly journals Fine mapping of Brassica napus blackleg resistance gene Rlm1 through bulked segregant RNA sequencing

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Fuyou Fu ◽  
Xunjia Liu ◽  
Rui Wang ◽  
Chun Zhai ◽  
Gary Peng ◽  
...  
Keyword(s):  
Brassica Napus ◽  
Resistance Gene ◽  
Rna Sequencing ◽  
Catalytic Domain ◽  
Leptosphaeria Maculans ◽  
Snp Markers ◽  
Specific Pcr ◽  
Dual Specificity ◽  
Kinase Catalytic Domain ◽  
Allele Specific

Abstract The fungal pathogen Leptosphaeria maculans causes blackleg disease on canola and rapeseed (Brassica napus) in many parts of the world. A B. napus cultivar, ‘Quinta’, has been widely used for the classification of L. maculans into pathogenicity groups. In this study, we confirmed the presence of Rlm1 in a DH line (DH24288) derived from B. napus cultivar ‘Quinta’. Rlm1 was located on chromosome A07, between 13.07 to 22.11 Mb, using a BC1 population made from crosses of F1 plants of DH16516 (a susceptible line) x DH24288 with bulked segregant RNA Sequencing (BSR-Seq). Rlm1 was further fine mapped in a 100 kb region from 19.92 to 20.03 Mb in the BC1 population consisting of 1247 plants and a F2 population consisting of 3000 plants using SNP markers identified from BSR-Seq through Kompetitive Allele-Specific PCR (KASP). A potential resistance gene, BnA07G27460D, was identified in this Rlm1 region. BnA07G27460D encodes a serine/threonine dual specificity protein kinase, catalytic domain and is homologous to STN7 in predicted genes of B. rapa and B. oleracea, and A. thaliana. Robust SNP markers associated with Rlm1 were developed, which can assist in introgression of Rlm1 and confirm the presence of Rlm1 gene in canola breeding programs.

Identification and mapping of a third blackleg resistance locus in Brassica napus derived from B. rapa subsp. sylvestris

Genome ◽  
2008 ◽  
Vol 51 (1) ◽  
pp. 64-72 ◽  
Author(s):  
Fengqun Yu ◽  
Derek J. Lydiate ◽  
S. Roger Rimmer
Keyword(s):  
Brassica Napus ◽  
Linkage Group ◽  
Resistance Gene ◽  
Leptosphaeria Maculans ◽  
Resistance Locus ◽  
Dominant Allele ◽  
Breeding Lines ◽  
Disease Reaction ◽  
Blackleg Resistance ◽  
Map Location

The spectrum of resistance to isolates of Leptosphaeria maculans and the map location of a new blackleg resistance gene found in the canola cultivar Brassica napus ‘Surpass 400’ are described. Two blackleg resistance genes, LepR1 and LepR2, from B. rapa subsp. sylvestris and introgressed in B. napus were identified previously. ‘Surpass 400’ also has blackleg resistance introgressed from B. rapa subsp. sylvestris. Using 31 diverse isolates of L. maculans, the disease reaction of ‘Surpass 400’ was compared with those of the resistant breeding lines AD9 (which contains LepR1), AD49 (which contains LepR2), and MC1-8 (which contains both LepR1 and LepR2). The disease reaction on ‘Surpass 400’ was different from those observed on AD9 and MC1-8, indicating that ‘Surpass 400’ carries neither LepR1 nor both LepR1 and LepR2 in combination. Disease reactions of ‘Surpass 400’ to most of the isolates tested were indistinguishable from those of AD49, which suggested ‘Surpass 400’ might contain LepR2 or a similar resistance gene. Classical genetic analysis of F1 and BC1 plants showed that a dominant allele conferred resistance to isolates of L. maculans in ‘Surpass 400’. The resistance gene, which mapped to B. napus linkage group N10 in an interval of 2.9 cM flanked by microsatellite markers sR12281a and sN2428Rb and 11.7 cM below LepR2, was designated LepR3. A 9 cM region of the B. napus genome containing LepR3 was found to be syntenic with a segment of Arabidopsis chromosome 5.

scholarly journals Breakdown of a Brassica rapa subsp. sylvestris Single Dominant Blackleg Resistance Gene in B. napus Rapeseed by Leptosphaeria maculans Field Isolates in Australia

Plant Disease ◽  
2003 ◽  
Vol 87 (6) ◽  
pp. 752-752 ◽  
Author(s):  
H. Li ◽  
K. Sivasithamparam ◽  
M. J. Barbetti
Keyword(s):  
Brassica Napus ◽  
Resistance Gene ◽  
Disease Severity ◽  
Brassica Rapa ◽  
Oilseed Rape ◽  
Leptosphaeria Maculans ◽  
Blackleg Disease ◽  
Field Isolates ◽  
Western Australian ◽  
Lower Stem

Blackleg, caused by Leptosphaeria maculans, is a major disease of oilseed rape (Brassica napus) grown in Canada, Europe, and Australia. Cv. Surpass 400 was released in Australia in 2000 as the most resistant cultivar to L. maculans. It carries a single dominant resistance gene from B. rapa subsp. sylvestris. This cultivar usually shows a hypersensitive response to L. maculans characterized by small, dark brown lesions that are necrotic, localized, and without pycnidia on cotyledons, leaves, and stems. However, in 2001 on a Western Australian experimental farm, a small proportion of the lesions on the lower stem and crown region of cv. Surpass 400 were typical of those observed in susceptible cultivars, which were brown, necrotic lesions with a darker margin, but they contained fewer pycnidia. Forty seedlings of cv. Surpass 400 and susceptible cv. Westar were inoculated with pycnidiospore suspensions (106/ml) of each of 18 isolates taken from lesions on cv. Surpass 400. All 18 isolates caused collapse of cotyledons of susceptible cv. Westar. Four of these isolates caused large cotyledon lesions with some pycnidia on cv. Surpass 400. Three of these four isolates were subsequently inoculated onto 60 seedlings per isolate, at each of the four cotyledon lobes of each seedling of the two cultivars. Inoculated plants were assessed for disease severity on cotyledons and transplanted to the field 14 days after inoculation. The cotyledons of inoculated cv. Surpass 400 showed characteristic large, necrotic lesions with pycnidia, while the cotyledons of cv. Westar had collapsed and contained a mass of pycnidia. Blackleg disease severity in the crown region of the stem was assessed at 2 weeks before harvest. Fifty-four percent of the cv. Surpass 400 transplanted inoculated plants subsequently developed susceptible symptoms of crown cankers on stems. These symptoms were deep, girdling, brown lesions on the plant crowns with some pycnidia. One hundred percent of cv. Westar plants were infected and dead at this stage. This confirmed the ability of these field isolates to overcome the single dominant resistance gene present in cv. Surpass 400. To our knowledge, this is the first report of breakdown of a single dominant B. rapa subsp. sylvestris gene based resistance to blackleg in oilseed rape in the field.

Production of rapeseed ( Brassica napus ) interspecific hybrids with rape ( Brassica campestris ) and mustard ( Brassica juncea )

2017 ◽  
Vol 256 ◽  
pp. S99
Author(s):  
Ainash Daurova ◽  
Dias Daurov ◽  
Dmitriy Volkov ◽  
Makpal Bakbergenova ◽  
Kabyl Zhambakin ◽  
...  
Keyword(s):  
Brassica Napus ◽  
Brassica Juncea ◽  
Interspecific Hybrids ◽  
Brassica Campestris

Genetic mapping of the Leptosphaeria maculans avirulence gene corresponding to the LepR1 resistance gene of Brassica napus

2011 ◽  
Vol 124 (3) ◽  
pp. 505-513 ◽  
Author(s):  
Kaveh Ghanbarnia ◽  
Derek J. Lydiate ◽  
S. Roger Rimmer ◽  
Genyi Li ◽  
H. Randy Kutcher ◽  
...  
Keyword(s):  
Brassica Napus ◽  
Genetic Mapping ◽  
Resistance Gene ◽  
Leptosphaeria Maculans ◽  
Avirulence Gene

scholarly journals Genetic Control and Host Range of Avirulence Toward Brassica napus Cultivars Quinta and Jet Neuf in Leptosphaeria maculans

2001 ◽  
Vol 91 (1) ◽  
pp. 70-76 ◽  
Author(s):  
M. H. Balesdent ◽  
A. Attard ◽  
D. Ansan-Melayah ◽  
R. Delourme ◽  
M. Renard ◽  
...  
Keyword(s):  
Brassica Napus ◽  
Resistance Gene ◽  
Single Gene ◽  
Leptosphaeria Maculans ◽  
Avirulence Gene ◽  
Gene Interactions ◽  
Deleterious Gene ◽  
Or Genes ◽  
Avr Gene ◽  
Avr Genes

Leptosphaeria maculans causes blackleg of oilseed rape. Gene-for-gene interactions between race PG3 and Brassica napus cv. Quinta were related to interaction between the fungal avirulence (Avr) gene AvrLm1 and the corresponding resistance gene Rlm1. AvrLm1 isolates were aviru-lent on cvs. Doublol, Vivol, Columbus, and Capitol, and no recombinant phenotypes were observed in the progeny of two AvrLm1 × avrLm1 crosses, suggesting that all of these cultivars may possess Rlm1 or genes displaying the same recognition spectrum, or that a cluster of Avr genes is present at the Avrlm1 locus. In one cross, segregation distortion was observed at the AvrLm1 locus that could be explained by interaction between AvrLm1 and one unlinked deleterious gene, termed Del1. Incompatibility toward cvs. Jet Neuf and Darmor.bzh was governed by a single gene, unlinked to AvrLm1 or Del1. This avirulence gene was termed AvrLm4. Preliminary plant genetic analysis suggested the occurrence of a corresponding dominant resistance gene, termed Rlm4, present in the Quinta line analyzed and linked to Rlm1.

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