scholarly journals Polygenic Resistance of Pepper to Potyviruses Consists of a Combination of Isolate-Specific and Broad-Spectrum Quantitative Trait Loci

1997 ◽  
Vol 10 (7) ◽  
pp. 872-878 ◽  
Author(s):  
Carole Caranta ◽  
Véronique Lefebvre ◽  
Alain Palloix
Keyword(s):  
Quantitative Trait Loci ◽  
Broad Spectrum ◽  
Quantitative Trait ◽  
Quantitative Resistance ◽  
Specific Effect ◽  
Major Effect ◽  
Minor Effect ◽  
Resistance Factors ◽  
Specific Effects ◽  
Trait Loci

At least six potyviruses infect pepper crops around the world. Only monogenic resistance with isolate-specific effects or broad-spectrum effects against potyviruses has been identified. Quantitative trait loci (QTLs) for resistance to two potato virus Y (PVY) isolates and to potyvirus E have been mapped in a doubled-haploid progeny from the hybrid between the line Perennial with resistance factors against several potyviruses and the line Yolo Wonder, with 172 DNA markers. Eleven chromosomal regions were found to be associated with quantitative resistance to PVY and potyvirus E by both analysis of variance and non-parametric tests. This resistance results from the association of a major-effect QTL and several minor-effect QTLs. Two minor-effect QTLs originated from the susceptible parent. In addition to additive-effect QTLs, interactions between QTLs were also identified. Based on their spectrum of action, we discriminated QTLs with PVY isolate-or potyvirus-specific effect and loci involved in the resistance to several distinct potyviruses. The locations of QTLs were compared with loci having known qualitative effects against potyviruses; QTLs for PVY and potyvirus E resistance were detected in the vicinity of the pvr2 and pvr6 loci. The origin of the broad-spectrum resistance against potyviruses and the relationships between major genes and QTLs are discussed.

scholarly journals Quantitative Trait Loci ControllingPhytophthora cactorumResistance in the Cultivated Octoploid Strawberry (Fragariaxananassa)

2018 ◽  
Author(s):  
Charlotte F. Nellist ◽  
Robert J. Vickerstaff ◽  
Maria K. Sobczyk ◽  
César Marina-Montes ◽  
Philip Brain ◽  
...  
Keyword(s):  
Quantitative Trait Loci ◽  
Quantitative Trait ◽  
Genome Wide Association Study ◽  
Quantitative Resistance ◽  
Major Effect ◽  
Crown Rot ◽  
Economic Losses ◽  
Trait Loci ◽  
Soft Fruit ◽  
Rot Disease

ABSTRACTThe cultivated strawberry,Fragaria x ananassa(Fragariaspp.) is the most economically important global soft fruit.Phytophthora cactorum, a water-borne oomycete causes economic losses in strawberry production globally. A bi-parental cross of octoploid cultivated strawberry segregating for resistance toP. cactorum, the causative agent of crown rot disease, was screened using artificial inoculation. Multiple resistance quantitative trait loci (QTL) were identified and mapped. Three major effect QTL (FaRPc6C,FaRPc6DandFaRPc7D) explained 36% of the variation observed and in total, the detected QTL explained 86% of the variation observed. There were no epistatic interactions detected between the three major QTLs. Testing a subset of the mapping population progeny against a range ofP. cactorumisolates revealed no major differences in host response, however, some lines showed higher susceptibility than predicted, indicating that additional undetected factors may affect the expression of some quantitative resistance loci. Using historic crown rot disease score data from strawberry accessions, a preliminary genome-wide association study of 114 individuals revealed additional loci associated with resistance toP. cactorum. Mining ofFragaria vescaHawaii 4 v1.1 genome revealed candidate resistance genes in the QTL regions.

scholarly journals Quantitative trait loci for lifespan of mated Drosophila melanogaster affect both sexes

2002 ◽  
Vol 80 (3) ◽  
pp. 225-230 ◽  
Author(s):  
SARAH G. REIWITCH ◽  
SERGEY V. NUZHDIN
Keyword(s):  
Quantitative Trait Loci ◽  
Quantitative Trait ◽  
Recombinant Inbred Lines ◽  
Inbred Lines ◽  
Specific Effects ◽  
Genome Wide ◽  
Evolution Of Life ◽  
Trait Loci ◽  
Males And Females ◽  
Qtls Mapping

The properties of alleles at quantitative trait loci (QTLs) contributing to variation in lifespan should be described to determine the mechanisms of evolution of life length and to predict its future changes. Previously, we and others conducted genome-wide screens for QTLs that segregate among one panel of recombinant inbred lines (RILs) using a dense molecular marker map. In non-stressful conditions, QTLs effecting the lifespans of virgin females and males were frequently sex specific. In an unrelated panel of RILs, the effects of QTLs in flies maintained in cages with mixed sexes were similar in both sexes. Here, we re-measured the lifespans of the former panel of RILs in cages with mixed sex cohorts. Lifespan declined owing to mating. The amount of decline correlated between sexes within lines. QTLs mapping to the intervals 15A–19C, 50B–57C, 63A–65A, and 96F–99B had similar effects on the lifespans of both males and females. These QTLs have previously been detected in virgin flies surveys and had sex- and/or environment-specific effects.

scholarly journals Quantitative Trait Loci With Age-Specific Effects on Fecundity inDrosophila melanogaster

Genetics ◽  
2005 ◽  
Vol 172 (3) ◽  
pp. 1595-1605 ◽  
Author(s):  
Jeff Leips ◽  
Paul Gilligan ◽  
Trudy F. C. Mackay
Keyword(s):  
Quantitative Trait Loci ◽  
Quantitative Trait ◽  
Specific Effects ◽  
Trait Loci

scholarly journals Joint analysis of quantitative trait loci and major-effect causative mutations affecting meat quality and carcass composition traits in pigs

BMC Genetics ◽  
2011 ◽  
Vol 12 (1) ◽  
pp. 76 ◽  
Author(s):  
Pierre Cherel ◽  
José Pires ◽  
Jérôme Glénisson ◽  
Denis Milan ◽  
Nathalie Iannuccelli ◽  
...  
Keyword(s):  
Quantitative Trait Loci ◽  
Meat Quality ◽  
Quantitative Trait ◽  
Major Effect ◽  
Carcass Composition ◽  
Joint Analysis ◽  
Trait Loci

scholarly journals Quantitative trait loci with sex-specific effects for internal organs weights and hematocrit value in a broiler-layer cross

2015 ◽  
Vol 57 (2) ◽  
pp. 215-224 ◽  
Author(s):  
A. S. A. M. T. Moura ◽  
M. C. Ledur ◽  
C. Boschiero ◽  
K. Nones ◽  
L. F. B. Pinto ◽  
...  
Keyword(s):  
Quantitative Trait Loci ◽  
Quantitative Trait ◽  
Internal Organs ◽  
Specific Effects ◽  
Trait Loci

scholarly journals Two Independent Quantitative Trait Loci Are Responsible for Novel Resistance to Beet curly top virus in Common Bean Landrace G122

2010 ◽  
Vol 100 (10) ◽  
pp. 972-978 ◽  
Author(s):  
Richard C. Larsen ◽  
Chester J. Kurowski ◽  
Phillip N. Miklas
Keyword(s):  
Quantitative Trait Loci ◽  
Linkage Group ◽  
Common Bean ◽  
Quantitative Trait ◽  
Rapd Marker ◽  
The United States ◽  
Effective Control ◽  
Minor Effect ◽  
Beet Curly Top Virus ◽  
Trait Loci

Beet curly top virus, often referred to as Curly top virus (CTV), is an important virus disease of common bean in the semiarid regions of the United States, Canada, and Mexico and the only effective control is genetic resistance. Our objective was to determine if dry bean landrace G122, which lacks the Bct gene for resistance to CTV, contains novel resistance to the virus. Two populations, GT-A and GT-B, consisting of 98 F5:7 recombinant inbred lines (RILs) in total were derived from a cross between G122 and the susceptible variety Taylor Horticultural and evaluated for phenotypic response to natural CTV field infection. Genetic analyses revealed random amplified polymorphism DNA (RAPD) markers associated with a major-effect quantitative trait loci (QTL) from G122 which exhibited stable expression across 3 years in both populations. Phenotypic variation explained by the QTL in GT-A (37.6%) was greater than in GT-B (20.4%). RAPD marker Q14.973 was converted to a sequence-characterized amplified region (SCAR) and designated SQ14.973. The SCAR was used to locate the QTL on linkage group 6 of the Phaseolus core map. A survey of 74 common bean cultivars and breeding lines revealed SQ14.973 would be widely useful for marker-assisted selection of the QTL. An additional minor-effect QTL from G122 was detected on linkage group 7. G122 was determined to possess novel resistance to CTV conditioned by at least two genes, one with major the other minor effect.

scholarly journals Eggplant Resistance to the Ralstonia solanacearum Species Complex Involves Both Broad-Spectrum and Strain-Specific Quantitative Trait Loci

2017 ◽  
Vol 8 ◽  
Author(s):  
Sylvia Salgon ◽  
Cyril Jourda ◽  
Christopher Sauvage ◽  
Marie-Christine Daunay ◽  
Bernard Reynaud ◽  
...  
Keyword(s):  
Quantitative Trait Loci ◽  
Broad Spectrum ◽  
Ralstonia Solanacearum ◽  
Quantitative Trait ◽  
Species Complex ◽  
Trait Loci

scholarly journals Quantitative trait loci on chromosome 5 for susceptibility to frequency-specific effects on hearing in DBA/2J mice

2015 ◽  
Vol 64 (3) ◽  
pp. 241-251 ◽  
Author(s):  
Sari SUZUKI ◽  
Masashi ISHIKAWA ◽  
Takuya UEDA ◽  
Yasuhiro OHSHIBA ◽  
Yuki MIYASAKA ◽  
...  
Keyword(s):  
Quantitative Trait Loci ◽  
Quantitative Trait ◽  
Chromosome 5 ◽  
Specific Effects ◽  
Trait Loci

scholarly journals Quantitative Trait Loci Mapping of Multiple Independent Loci for Resistance to Fusarium oxysporum f. sp. vasinfectum Races 1 and 4 in an Interspecific Cotton Population

2018 ◽  
Vol 108 (6) ◽  
pp. 759-767 ◽  
Author(s):  
Congli Wang ◽  
Mauricio Ulloa ◽  
Tra Duong ◽  
Philip A. Roberts
Keyword(s):  
Quantitative Trait Loci ◽  
Fusarium Oxysporum ◽  
Quantitative Trait ◽  
Recombinant Inbred Lines ◽  
Interspecific Cross ◽  
Minor Effect ◽  
Root Knot Nematode ◽  
Major Qtls ◽  
Trait Loci ◽  
Plant Injury

Fusarium wilt, caused by the soilborne fungal pathogen Fusarium oxysporum f. sp. vasinfectum, is a vascular disease of cotton (Gossypium spp.). F. oxysporum f. sp. vasinfectum race 1 (FOV1) causes major plant injury and yield loss in G. hirsutum cultivars with coinfection with root-knot nematode (Meloidogyne incognita), while F. oxysporum f. sp. vasinfectum race 4 (FOV4) causes plant damage without nematode coinfection in G. hirsutum and in G. barbadense cultivars. Quantitative trait loci (QTL) analysis of the interspecific cross G. barbadense Pima S-7 × G. hirsutum Acala NemX revealed separate multiple loci determining resistance to FOV1 and FOV4, confirming that race specificity occurs in F. oxysporum f. sp. vasinfectum. Based on the area under the disease progress stairs, six major QTLs on chromosomes (Chrs) 1, 2, 12, 15 (2), and 21 contributing 7 to 15% to FOV1 resistance and two major QTLs on Chrs 14 and 17 contributing 12 to 33% to FOV4 resistance were identified. Minor-effect QTLs contributing to resistance to both FOV1 and FOV4 were also identified. These results define and establish a pathosystem of race-specific resistance under polygenic control. This research also validates the importance of previously reported markers and chromosome regions and adds new information for the location of F. oxysporum f. sp. vasinfectum resistance genes. Some F8 recombinant inbred lines have resistance to both FOV1 and FOV4 and also to root-knot nematode, providing multiple resistance sources for breeding.

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