scholarly journals Interactions in the Brassica napus ‐ Pyrenopeziza brassicae pathosystem and sources of resistance to P . brassicae (light leaf spot)

2021 ◽  
Author(s):  
C. S. Karandeni Dewage ◽  
A. Qi ◽  
H. U. Stotz ◽  
Y. J. Huang ◽  
B. D. L. Fitt
Keyword(s):  
Brassica Napus ◽  
Leaf Spot ◽  
Sources Of Resistance

scholarly journals Identification and characterization of maize lines resistant to leaf diseases

2019 ◽  
Vol 40 (2) ◽  
pp. 517
Author(s):  
Kaian Albino Corazza Kaefer ◽  
Adilson Ricken Schuelter ◽  
Ivan Schuster ◽  
Jonatas Marcolin ◽  
Eliane Cristina Gruszka Vendruscolo
Keyword(s):  
Genetic Diversity ◽  
Leaf Spot ◽  
Block Design ◽  
Snp Markers ◽  
Gray Leaf Spot ◽  
Leaf Blight ◽  
Yield Reduction ◽  
Northern Leaf Blight ◽  
Sources Of Resistance ◽  
White Leaf

Among the maize leaf diseases, white leaf spot, northern leaf blight, gray leaf spot, and southern rust are recognized not only by the potential for grain yield reduction but also by the widespread occurrence in the producing regions of Brazil and the world. The aim of this study was to characterize common maize lines for resistance to white leaf spot, northern leaf blight, gray leaf spot, and southern rust and suggest crosses based on the genetic diversity detected in SNP markers. The experiment was conducted in a randomized block design with three replications in order to characterize 72 maize lines. Genotypic values were predicted using the REML/BLUP procedure. These 72 lines were genotyped with SNP markers using the 650K platform (Affymetrix®) for the assessment of the genetic diversity. Genetic diversity was quantified using the Tocher and UPGMA methods. The existence of genetic variability for disease resistance was detected among maize lines, which made possible to classify them into three large groups (I, II, and III). The maize lines CD 49 and CD50 showed a good performance and can be considered sources of resistance to diseases. Therefore, their use as gene donors in maize breeding programs is recommended. Considering the information of genetic distance together with high heritability for leaf diseases, backcrossing of parent genotypes with different resistance levels, such as those of the lines CD49 x CD69 and CD50 x CD16, may result in new gene combinations, as they are divergent and meet good performances.

New sources of resistance to anthracnose and angular leaf spot of beans (Phaseolus vulgaris L.)

Euphytica ◽  
1982 ◽  
Vol 31 (3) ◽  
pp. 741-754 ◽  
Author(s):  
H. F. Schwartz ◽  
M. A. Pastor Corrales ◽  
S. P. Singh
Keyword(s):  
Phaseolus Vulgaris ◽  
Leaf Spot ◽  
Angular Leaf Spot ◽  
Phaseolus Vulgaris L ◽  
Sources Of Resistance

scholarly journals Identification of Sources of Resistance to Gray leaf spot in Stenotaphrum germplasm

Crop Science ◽  
2020 ◽  
Author(s):  
Esdras M. Carbajal ◽  
Bangya Ma ◽  
M. Carolina Zuleta ◽  
W. Casey Reynolds ◽  
Consuelo Arellano ◽  
...  
Keyword(s):  
Leaf Spot ◽  
Gray Leaf Spot ◽  
Sources Of Resistance

Sources of Resistance to Gray Leaf Spot of Corn

Plant Disease ◽  
1994 ◽  
Vol 78 (12) ◽  
pp. 1153 ◽  
Author(s):  
S. T. COATES
Keyword(s):  
Leaf Spot ◽  
Gray Leaf Spot ◽  
Sources Of Resistance

scholarly journals Predicting light leaf spot (Pyrenopeziza brassicae) risk on winter oilseed rape (Brassica napus) in England and Wales, using survey, weather and crop information

2004 ◽  
Vol 53 (6) ◽  
pp. 713-724 ◽  
Author(s):  
S. J. Welham ◽  
J. A. Turner ◽  
P. Gladders ◽  
B. D. L. Fitt ◽  
N. Evans ◽  
...  
Keyword(s):  
Brassica Napus ◽  
Oilseed Rape ◽  
Leaf Spot ◽  
Winter Oilseed Rape ◽  
England And Wales

scholarly journals Host–pathogen interactions in relation to management of light leaf spot disease (caused by Pyrenopeziza brassicae) on Brassica species

2018 ◽  
Vol 69 (1) ◽  
pp. 9 ◽  
Author(s):  
Chinthani S. Karandeni Dewage ◽  
Coretta A. Klöppel ◽  
Henrik U. Stotz ◽  
Bruce D. L. Fitt
Keyword(s):  
Leaf Spot ◽  
Fungal Pathogens ◽  
Molecular Mechanisms ◽  
Brassica Species ◽  
Leaf Spot Disease ◽  
Yield Losses ◽  
Sources Of Resistance ◽  
Management Tools ◽  
Brussels Sprouts ◽  
Main Component

Light leaf spot, caused by Pyrenopeziza brassicae, is the most damaging disease problem in oilseed rape (Brassica napus) in the United Kingdom. According to recent survey data, the severity of epidemics has increased progressively across the UK, with yield losses of up to £160M per annum in England and more severe epidemics in Scotland. Light leaf spot is a polycyclic disease, with primary inoculum consisting of airborne ascospores produced on diseased debris from the previous cropping season. Splash-dispersed conidia produced on diseased leaves are the main component of the secondary inoculum. Pyrenopeziza brassicae is also able to infect and cause considerable yield losses on vegetable brassicas, especially Brussels sprouts. There may be spread of light leaf spot among different Brassica species. Since they have a wide host range and frequent occurrence of sexual reproduction, P. brassicae populations are likely to have considerable genetic diversity, and evidence suggests population variations between different geographic regions, which need further study. Available disease-management tools are not sufficient to provide adequate control of the disease. There is a need to identify new sources of resistance, which can be integrated with fungicide applications to achieve sustainable management of light leaf spot. Several major resistance genes and quantitative trait loci have been identified in previous studies, but rapid improvements in the understanding of molecular mechanisms underpinning B. napus–P. brassicae interactions can be expected through exploitation of novel genetic and genomic information for brassicas and extracellular fungal pathogens.

scholarly journals Evaluation of Sclerotinia Stem Rot Resistance in Oilseed Brassica napus Using a Petiole Inoculation Technique Under Greenhouse Conditions

Plant Disease ◽  
2004 ◽  
Vol 88 (9) ◽  
pp. 1033-1039 ◽  
Author(s):  
J. Zhao ◽  
A. J. Peltier ◽  
J. Meng ◽  
T. C. Osborn ◽  
C. R. Grau
Keyword(s):  
Brassica Napus ◽  
Germ Plasm ◽  
Evaluation Criteria ◽  
Lesion Length ◽  
Sclerotinia Stem Rot ◽  
Flowering Stage ◽  
Sources Of Resistance ◽  
Inoculation Technique ◽  
Spring Type ◽  
Canola Quality

A petiole inoculation technique was adapted for evaluating resistance of oilseed Brassica napus seedlings to Sclerotinia sclerotiorum. In the first of four experiments, four isolates of S. sclerotiorum were tested, two originating from soybean and two from B. napus. In all, 10 to 47 B. napus accessions were inoculated in the seedling stage and responses to isolates were evaluated using days to wilt (DW) and a lesion phenotype index (LP). There were no significant differences in virulence among the four isolates for DW and only slight differences for LP. However, significant differences (P < 0.0001) were observed among the B. napus accessions for DW and LP in this experiment and in subsequent experiments using one isolate. The responses of accessions were consistent among experiments and among evaluation criteria. Higher levels of resistance were found among winter-type than spring-type accessions, and among rapeseed-quality compared with canola-quality accessions. The most resistant accessions identified also were the most resistant when inoculated at the flowering stage. Terminal stems were inoculated immediately below the lowest flower and stem lesion length (SLL) was used to characterize the interaction phenotype of each accession. The petiole inoculation technique can be used successfully to differentiate oilseed B. napus germ plasm for response to S. sclerotiorum. This inoculation technique and the sources of resistance identified in this study may be used to determine inheritance resistance to S. sclerotiorum and for improving oilseed B. napus cultivars for resistance to this important pathogen.

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