Abstract
Abstract Key message A large effect and environmentally stable QTL was identified on LG2 that confers high levels of INSV resistance in lettuce cultivar Eruption. Abstract Impatiens necrotic spot virus (INSV) has recently emerged as a major threat to lettuce production in the Salinas Valley of California, the region which contributes over 60% of the US national supply. This thrips-transmitted virus can infect lettuce plants at any growth stage, causing premature death or a total loss of marketability. Both INSV and its thrips vector have broad host ranges, which complicate disease management. Utilizing genetic resistance is the most sustainable approach; however, complete immunity has not been identified and the genetic basis of resistance to INSV in lettuce remains poorly understood. This study aimed to identify quantitative trait loci (QTL) and elucidate the underlying mechanism of INSV resistance in ‘Eruption,’ a lettuce cultivar exhibiting highly stable partial resistance across environments. Using 162 F 6:8 recombinant inbred lines (RILs) developed from a cross between moderately susceptible ‘Reine des Glaces’ and ‘Eruption,’ and a genetic linkage map comprising 1598 single nucleotide polymorphism (SNP) markers, phenotypic data collected from field and greenhouse experiments consistently revealed a highly significant, major QTL on linkage group 2. This QTL exhibited partial dominance with additive effects, explaining up to 61% of the total phenotypic variation for INSV disease severity. Furthermore, INSV resistance was found to be highly heritable, with heritability estimates of up to 0.89, indicating strong genetic control. Results of this study are crucial for fine mapping and the development of marker-assisted selection assays to accelerate the breeding of more advanced INSV-resistant lettuce cultivars.
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Claims 6
Claim · model-written summary
A large-effect, environmentally stable QTL on LG2 confers high levels of INSV resistance in lettuce cultivar Eruption.
- Taxon
- lettuce
Lactuca sativae1 - Material
- Eruptione1
- Interactor
- INSV
Impatiens necrotic spot viruse1pathogen - Gene
- QTLe1
- Outcome
- INSV resistancee1
- Qualifier
- environmentally stablee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“A large effect and environmentally stable QTL was identified on LG2 that confers high levels of INSV resistance in lettuce cultivar Eruption”
Claim · model-written summary
The QTL explains up to 61% of the total phenotypic variation for INSV disease severity.
- Taxon
- lettuceLactuca sativae1
- Interactor
- INSVImpatiens necrotic spot viruse3pathogen
- Gene
- QTLe3
- Outcome
- total phenotypic variation for INSV disease severitye3
- Value
- up to 61%e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“A large effect and environmentally stable QTL was identified on LG2 that confers high levels of INSV resistance in lettuce cultivar Eruption”
e3“This QTL exhibited partial dominance with additive effects, explaining up to 61% of the total phenotypic variation for INSV disease severity”
Claim · model-written summary
The QTL shows partial dominance with additive effects.
- Taxon
- lettuceLactuca sativae1
- Gene
- QTLe3
- Outcome
- partial dominance with additive effectse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“A large effect and environmentally stable QTL was identified on LG2 that confers high levels of INSV resistance in lettuce cultivar Eruption”
e3“This QTL exhibited partial dominance with additive effects, explaining up to 61% of the total phenotypic variation for INSV disease severity”
Claim · model-written summary
INSV resistance is highly heritable, with heritability estimates of up to 0.89.
- Taxon
- lettuceLactuca sativae1
- Interactor
- INSVImpatiens necrotic spot viruse4pathogen
- Outcome
- heritability estimatese4
- Value
- up to 0.89e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“A large effect and environmentally stable QTL was identified on LG2 that confers high levels of INSV resistance in lettuce cultivar Eruption”
e4“INSV resistance was found to be highly heritable, with heritability estimates of up to 0.89, indicating strong genetic control”
Claim · model-written summary
Eruption shows highly stable partial resistance to INSV across environments.
- Taxon
- lettuceLactuca sativae5
- Material
- Eruptione5
- Outcome
- partial resistancee5
- Qualifier
- highly stablee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“‘Eruption,’ a lettuce cultivar exhibiting highly stable partial resistance across environments”
Claim · model-written summary
A major QTL on linkage group 2 was consistently significant for INSV disease severity in field and greenhouse experiments.
- Taxon
- lettuceLactuca sativae1
- Gene
- major QTL on linkage group 2e2
- Outcome
- INSV disease severitye3
- Setting
- field and greenhouse experimentse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“A large effect and environmentally stable QTL was identified on LG2 that confers high levels of INSV resistance in lettuce cultivar Eruption”
e2“phenotypic data collected from field and greenhouse experiments consistently revealed a highly significant, major QTL on linkage group 2”
e3“This QTL exhibited partial dominance with additive effects, explaining up to 61% of the total phenotypic variation for INSV disease severity”