scholarly journals Quantitative Trait Loci Mapping Of Philippine Downy Mildew Resistance Gene In Maize (Zea Mays L.)

Zuriat ◽  
2015 ◽  
Vol 13 (1) ◽  
Author(s):  
D. Ruswandi ◽  
D. M. Hautea ◽  
A. L. Carpena ◽  
R. M. Lantican ◽  
A. M. Salazar ◽  
...  
Keyword(s):  
Downy Mildew ◽  
Inbred Line ◽  
Zea Mays L ◽  
Disease Incidence ◽  
Downy Mildew Resistance ◽  
Generation Mean Analysis ◽  
Cross Combination ◽  
Phenotypic Data ◽  
First Time ◽  
Line P

An experiment to locate QTL conferring resistance against Peronosclerospora philippinensis causing Philippine downy mildew was observed in a BC1F2 population developed from a cross between the susceptible inbred line Pi 23 and the resistant inbred line P 345. Phenotypic data were collected in Los Baños, UPLB for disease incidence. A total of four regions were associated with disease incidence. Some of QTL associated with disease incidence have been reported previously, and the remaining QTL are described here for the first time. The results on QTL analysis using molecular markers also agree with the previous study using classical generation mean analysis of the cross combination Pi 23 x P 345.

scholarly journals Components of Quantitative Resistance to Philippine Downy Mildew In Maize

Zuriat ◽  
2015 ◽  
Vol 13 (1) ◽  
Author(s):  
D. Ruswandi ◽  
A. D. Raymundo ◽  
R. M. Lantican ◽  
D. M. Hautea ◽  
A. M. Salazar ◽  
...  
Keyword(s):  
Downy Mildew ◽  
Inbred Line ◽  
Host Resistance ◽  
Quantitative Resistance ◽  
Disease Incidence ◽  
Transgressive Segregation ◽  
Adult Plant ◽  
Progress Curve ◽  
Systemic Symptoms ◽  
Line P

Resistance to Philippine downy mildew (Peronosclerospora philippinensis) was observed in a BC1F2 population developed from a cross between the susceptible inbred line Pi 23 and the resistant inbred line P 345. Five components of resistance namely, disease incidence, disease severity, onset of systemic symptoms, the-area- underdisease-progress- curve (AUDPC), and rate of downy mildew development affected host resistance reactions. All components were significantly correlated. The adult plant resistant reaction was evident in resistant progenies showing prolonged onset of systemic symptoms. Transgressive segregation that exceeded the high and low parent values was also observed for all components of quantitative resistance to Philippine downy mildew.

QTL mapping for downy mildew resistance in cucumber inbred line WI7120 (PI 330628)

2016 ◽  
Vol 129 (8) ◽  
pp. 1493-1505 ◽  
Author(s):  
Yuhui Wang ◽  
Kyle VandenLangenberg ◽  
Todd C. Wehner ◽  
Peter A. G. Kraan ◽  
Jos Suelmann ◽  
...  
Keyword(s):  
Qtl Mapping ◽  
Downy Mildew ◽  
Inbred Line ◽  
Downy Mildew Resistance ◽  
Mildew Resistance

scholarly journals Identification of Novel Loci and Candidate Genes for Cucumber Downy Mildew Resistance Using GWAS

Plants ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 1659
Author(s):  
Xiaoping Liu ◽  
Hongwei Lu ◽  
Panna Liu ◽  
Han Miao ◽  
Yuling Bai ◽  
...  
Keyword(s):  
Candidate Genes ◽  
Downy Mildew ◽  
Field Trials ◽  
Downy Mildew Resistance ◽  
Allele Mining ◽  
Phenotypic Data ◽  
Homologous Genes ◽  
Genome Wide ◽  
Causal Genes ◽  
Cucumber Downy Mildew

Downy mildew (DM) is one of the most serious diseases in cucumber. Multiple quantitative trait loci (QTLs) for DM resistance have been detected in a limited number of cucumber accessions. In this study we applied genome-wide association analysis (GWAS) to detected genetic loci for DM resistance in a core germplasm (CG) of cucumber lines that represent diverse origins and ecotypes. Phenotypic data on responses to DM infection were collected in four field trials across three years, 2014, 2015, and 2016. With the resequencing data of these CG lines, GWAS for DM resistance was performed and detected 18 loci that were distributed on all the seven cucumber chromosomes. Of these 18 loci, only six (dmG1.4, dmG4.1, dmG4.3, dmG5.2, dmG7.1, and dmG7.2) were detected in two experiments, and were considered as loci with a stable effect on DM resistance. Further, 16 out of the 18 loci colocalized with the QTLs that were reported in previous studies and two loci, dmG2.1 and dmG7.1, were novel ones identified only in this study. Based on the annotation of homologous genes in Arabidopsis and pairwise LD correlation analysis, several candidate genes were identified as potential causal genes underlying the stable and novel loci, including Csa1G575030 for dmG1.4, Csa2G060360 for dmG2.1, Csa4G064680 for dmG4.1, Csa5G606470 for dmG5.2, and Csa7G004020 for dmG7.1. This study shows that the CG germplasm is a very valuable resource carrying known and novel QTLs for DM resistance. The potential of using these CG lines for future allele-mining of candidate genes was discussed in the context of breeding cucumber with resistance to DM.

scholarly journals Genetic Analysis of Components of Resistance to Philippine Downy Mildew In Maize

Zuriat ◽  
2015 ◽  
Vol 13 (2) ◽  
Author(s):  
D. Ruswandi ◽  
A. L. Carpena ◽  
R. M. Lantican ◽  
A. M. Salazar ◽  
D. M. Hautea ◽  
...  
Keyword(s):  
Zea Mays ◽  
Downy Mildew ◽  
Zea Mays L ◽  
Disease Incidence ◽  
Systemic Symptom ◽  
Genetics Of Resistance ◽  
Components Of Resistance ◽  
Generation Means ◽  
Progress Curve ◽  
Development Analysis

The genetics of resistance to Philippine downy mildew in maize (Zea mays L.) caused by Peronosclerospora philippinensis was studied in progeny derived from crosses between the resistant inbred P 345 and susceptible inbred Pi 17 and Pi 23. Plant generations used in this study were the PS (susceptible lines Pi 17 and Pi 23); PR (P 345); extensively F1, F2; F3; BS and BR. Plants at three leaf stages were artificially inoculated and evaluated for components of resistance, namely: disease incidence, disease severity, onset of systemic symptom, area under disease progress curve, and rate of downy mildew development. Analysis of generation means indicate that additive- dominance with epistasis gene effect play important role in all components of resistance to Philippines downy mildew.

scholarly journals Identification of Downy Mildew Resistance Loci in Sunflower Germplasm

2017 ◽  
Vol 9 (4) ◽  
pp. 515-519 ◽  
Author(s):  
Maryam MIRZAHOSEIN-TABRIZI
Keyword(s):  
Helianthus Annuus ◽  
Downy Mildew ◽  
Genetic Map ◽  
Inbred Line ◽  
Resistance Genes ◽  
Positive Control ◽  
Inbred Lines ◽  
Downy Mildew Resistance ◽  
Mildew Resistance ◽  
Selection Of

Downy mildew caused by Plasmopara halstedii is one of the most economically important fungal diseases on sunflower (Helianthus annuus). To date, several downy mildew resistance genes called Pl genes have been reported on sunflower genetic map. Previous findings have confirmed that Iranian sunflower germplasms are harbouring Pl resistance genes that may be used to control downy mildew. In the current study, there were investigated the Pl5 and Pl16 downy mildew resistance genes in 51 inbred lines of Iranian sunflower, using PCR-based method. Fifteen differential lines carrying Pl5 and Pl16 downy mildew resistance genes were used as positive control. DNAs from 51 sunflower inbred lines were used in PCR reactions using primer pair RS1008 and Hap3 previously reported to serve as tightly linked to Pl16 and P5 loci, respectively. The PCR results confirmed the presence of two Pl16 and Pl5 bands with the size of about 280 and 1,580 bp, respectively, in differential lines. The results indicated that 1 inbred line out of 51 was found to carry Pl5 gene and 10 lines were found to carry Pl16 gene across the studied Iranian sunflower genotypes. These findings may be used to assist breeders for conservation and selection of downy mildew resistant sunflower genotypes.

Downy mildew resistance in maize (Zea mays L.) across Peronosclerospora species in lowland tropical Asia

2013 ◽  
Vol 43 ◽  
pp. 183-191 ◽  
Author(s):  
Zerka Rashid ◽  
P.H. Zaidi ◽  
M.T. Vinayan ◽  
S.S. Sharma ◽  
T.A. Srirama Setty
Keyword(s):  
Zea Mays ◽  
Downy Mildew ◽  
Zea Mays L ◽  
Downy Mildew Resistance ◽  
Mildew Resistance ◽  
Tropical Asia

Peronosporales of Skadovsky Zvenigorod Biological Station (Moscow Region)

2018 ◽  
Vol 52 (1) ◽  
pp. 91-100
Author(s):  
E. Yu. Blagoveshchenskaya
Keyword(s):  
Downy Mildew ◽  
European Part ◽  
Moscow Region ◽  
State University ◽  
Biological Station ◽  
Annotated List ◽  
European Part Of Russia ◽  
First Time ◽  
Moscow State University

The paper provides the results of seven-year study of downy mildew on Skadovsky Zvenigorod Biological Station of Moscow State University (ZBS MSU, Moscow Region). A total of 29 species of Peronosporales (Oomycota) were revealed during the study. An annotated list of species is presented, among them Peronospora anemones is recorded for the first time for Russia, P. chelidonii and P. stachydis are new for the European part of Russia, 8 species are new for the Moscow Region.

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