Abstract
Genetic characterization of anthracnose resistance in tomato ( Lycopersicon esculentum Mill.) caused by Colletotrichum coccodes (Wallr.) Hughes was accomplished using populations developed from crosses between the anthracnose susceptible cultivar US28 and three resistant breeding lines (115-4, 625-3, and 88B147) that varied in their degree of anthracnose resistance and relative stage of adaptation for commercial use. These lines were of common parental lineage with resistance derived from the small-fruited L. esculentum USDA PI 272636. Anthracnose lesion diameters and fruit weight were measured in puncture inoculated fruit of parental, F 1 , F 2 , and backcross generations within each cross. Correlation coefficients between fruit size and lesion diameter were low and generally nonsignificant. Estimates of broad and narrow sense heritabilities for resistance were moderate and declined as relative anthracnose susceptibility of the resistant parent increased coincident with increasing horticultural adaptation. A simple additive dominance model, m[d][h], was adequate to explain the genetic variance for anthracnose resistance in all crosses. Genetic variance for anthracnose resistance was primarily additive. The minimum number of effective factors or loci conditioning anthracnose resistance declined during attempts to transfer high levels of resistance from PI 272636 into adapted breeding lines.
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Claims 5
Claim · model-written summary
Fruit size and lesion diameter had low, generally nonsignificant correlations.
- Taxon
- tomato
Solanum lycopersicumt0 - Organ / stage
- fruite0
- Outcome
- lesion diametere0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Correlation coefficients between fruit size and lesion diameter were low and generally nonsignificant.”
t0“Tomato”
Claim · model-written summary
Broad and narrow sense heritabilities for resistance were moderate and declined with greater resistant-parent susceptibility and adaptation.
- Taxon
- tomatoSolanum lycopersicumt0
- Material
- resistant parente0
- Outcome
- broad and narrow sense heritabilities for resistancee0
- Direction
- declinede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Estimates of broad and narrow sense heritabilities for resistance were moderate and declined as relative anthracnose susceptibility of the resistant parent increased coincident with increasing horticultural adaptation.”
t0“Tomato”
Claim · model-written summary
An additive-dominance model explained resistance genetic variance in all crosses.
- Taxon
- tomatoSolanum lycopersicumt0
- Outcome
- genetic variance for anthracnose resistancee0
- Comparator
- all crossese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A simple additive dominance model, m[d][h], was adequate to explain the genetic variance for anthracnose resistance in all crosses.”
t0“Tomato”
Claim · model-written summary
Genetic variance for anthracnose resistance was primarily additive.
- Taxon
- tomatoSolanum lycopersicumt0
- Outcome
- Genetic variance for anthracnose resistance was primarily additivee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Genetic variance for anthracnose resistance was primarily additive.”
t0“Tomato”
Claim · model-written summary
The minimum number of effective resistance factors or loci declined during transfer into adapted lines.
- Taxon
- tomatoSolanum lycopersicumt0
- Material
- PI 272636e0
- Outcome
- minimum number of effective factors or loci conditioning anthracnose resistancee0
- Direction
- declinede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The minimum number of effective factors or loci conditioning anthracnose resistance declined during attempts to transfer high levels of resistance from PI 272636 into adapted breeding lines.”
t0“Tomato”