scholarly journals Resistance Quantitative Trait Loci Originating from Solanum sparsipilum Act Independently on the Sex Ratio of Globodera pallida and Together for Developing a Necrotic Reaction

2005 ◽  
Vol 18 (11) ◽  
pp. 1186-1194 ◽  
Author(s):  
Bernard Caromel ◽  
Didier Mugniéry ◽  
Marie-Claire Kerlan ◽  
Sandra Andrzejewski ◽  
Alain Palloix ◽  
...  
Keyword(s):  
Quantitative Trait Loci ◽  
Quantitative Trait ◽  
Major Effect ◽  
Cyst Nematode ◽  
Globodera Pallida ◽  
Coefficient Of Determination ◽  
Trait Loci ◽  
Lower Effect ◽  
Solanum Sparsipilum ◽  
Nematode Development

Plant resistance to nematodes is related to the ability of the host to reduce the development of nematode juveniles into females. Resistance to the potato cyst nematode (PCN) Globodera pallida, originating from the wild species Solanum sparsipilum, was dissected by a quantitative trait loci (QTL) approach. Two QTL explained 89% of the phenotypic variation. The QTL GpaVsspl on chromosome V displayedthe major effect on the cyst number (coefficient of determination [R2] = 76.6%). It restricted G. pallida development to 16.2% of juveniles, 81.5% of males, and 2.3% of females. The QTL GpaXIsspl chromosome XI displayed a lower effect on the cyst number (R2 = 12.7%). It restricted G. pallida development to 13.8% of juveniles, 35.4% of males, and 50.8% of females. Clones carrying both QTL restricted the nematode development to 58.1% juveniles, 41.1% of males, and 0.8% of females. We demonstrated that potato clones carrying both QTL showed a strong necrotic reaction in roots infected by nematodes, while no such reaction was observed in clones carrying a single QTL. This result underlines the importance to introgress together GpaVsspl and GpaXIsspl into potato cultivars, in order to reduce the density of this quarantine pest in soil and to decrease the risk of selecting overcoming G. pallida subpopulations.

Quantitative Trait Loci underlying Resistance to Three Soybean Cyst Nematode Populations in Soybean PI 404198A

Crop Science ◽  
2006 ◽  
Vol 46 (1) ◽  
pp. 224-233 ◽  
Author(s):  
B. Guo ◽  
D. A. Sleper ◽  
H. T. Nguyen ◽  
P. R. Arelli ◽  
J. G. Shannon
Keyword(s):  
Quantitative Trait Loci ◽  
Quantitative Trait ◽  
Soybean Cyst Nematode ◽  
Cyst Nematode ◽  
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 Resistance Quantitative Trait Loci qMi-C11 and qMi-C14 in Cotton Have Different Effects on the Development of Meloidogyne incognita, the Southern Root-Knot Nematode

Plant Disease ◽  
2019 ◽  
Vol 103 (5) ◽  
pp. 853-858 ◽  
Author(s):  
Mychele B. Da Silva ◽  
Richard F. Davis ◽  
Pawan Kumar ◽  
Robert L. Nichols ◽  
Peng W. Chee
Keyword(s):  
Quantitative Trait Loci ◽  
Meloidogyne Incognita ◽  
Quantitative Trait ◽  
Developmental Stages ◽  
Root Knot Nematode ◽  
Second Stage ◽  
Modes Of Action ◽  
Trait Loci ◽  
Stage Juvenile ◽  
Nematode Development

Quantitative trait loci (QTLs) qMi-C11 and qMi-C14 impart a high level of resistance to Meloidogyne incognita in cotton. Breeders had previously backcrossed both QTLs into the susceptible Coker 201 to create the highly resistant M-120 RNR, and we crossed Coker 201 and M-120 RNR to create near-isogenic lines with either qMi-C11 or qMi-C14. Previous work suggests different modes of action for qMi-C11 and qMi-C14. To document individual and combined effects of the QTLs on nematode development and reproduction, Coker 201 (neither QTL), M-120 RNR (both QTLs), CH11 near isoline (qMi-C11), and CH14 near isoline (qMi-C14) were inoculated with M. incognita. At 4, 8, 12, 16, 20, 25, and 30 days after inoculation (DAI), roots were stained to observe nematode developmental stages (second-stage juvenile [J2], swollen second-stage juvenile [SJ2], third-stage juvenile [J3], fourth-stage juvenile [J4], and female), and the number of galls was counted. At 20, 25, 30, and 40 DAI, M. incognita eggs were harvested and counted. At 30 DAI, 80% of the nematodes on Coker 201 were female compared with 50, 40, and 33% females on CH14, CH11, and M-120 RNR, respectively, and greater proportions of nematodes remained in J2 in M-120 RNR (41%), CH11 (58%), and CH14 (27%) than in Coker 201 (9%). More nematodes progressed to J3 or J4 on Coker 201 and CH14 than on CH11 or M-120 RNR. Coker 201 and CH14 had more galls than M-120 RNR. Coker 201 had more eggs than the other genotypes at 30 DAI. Nematode development beyond J2 or SJ2 was significantly reduced by qMi-C11, and development beyond J3 or J4 was significantly reduced by qMi-C14. This study confirms that qMi-C11 and qMi-C14 act at different times and have different effects on the development of M. incognita, and therefore, they have different modes of action.

Quantitative trait loci with additive and epistatic effects underlying resistance to two HG types of soybean cyst nematode

2017 ◽  
Vol 136 (5) ◽  
pp. 720-727 ◽  
Author(s):  
Yingpeng Han ◽  
Yunfu Tan ◽  
Haibo Hu ◽  
Wei Chang ◽  
Limin Dong ◽  
...  
Keyword(s):  
Quantitative Trait Loci ◽  
Quantitative Trait ◽  
Soybean Cyst Nematode ◽  
Cyst Nematode ◽  
Epistatic Effects ◽  
Trait Loci

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.

Genetic Mapping of Major-Effect Seed Dormancy Quantitative Trait Loci on Chromosome 2B using Recombinant Substitution Lines in Tetraploid Wheat

Crop Science ◽  
2016 ◽  
Vol 56 (1) ◽  
pp. 59-72 ◽  
Author(s):  
Shiaoman Chao ◽  
Elias Elias ◽  
David Benscher ◽  
Goro Ishikawa ◽  
Yung-Fen Huang ◽  
...  
Keyword(s):  
Quantitative Trait Loci ◽  
Genetic Mapping ◽  
Seed Dormancy ◽  
Quantitative Trait ◽  
Tetraploid Wheat ◽  
Major Effect ◽  
Substitution Lines ◽  
Trait Loci
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