Abstract
As climate changes, maintenance of yield stability requires efficient selection for drought tolerance. Drought-tolerant cultivars have been successfully but slowly bred by yield-based selection in arid environments. Marker-assisted selection accelerates breeding but is less effective for polygenic traits. Therefore, we investigated a selection based on phenotypic markers derived from automatic phenotyping systems. Our trial comprised 64 potato genotypes previously characterised for drought tolerance in ten trials representing Central European drought stress scenarios. In two trials, an automobile LIDAR system continuously monitored shoot development under optimal (C) and reduced (S) water supply. Six 3D images per day provided time courses of plant height (PH), leaf area (A3D), projected leaf area (A2D) and leaf angle (LA). The evaluation workflow employed logistic regression to estimate initial slope (k), inflection point (Tm) and maximum (Mx) for the growth curves of PH and A2D. Genotype × environment interaction affected all parameters significantly. Tm(A2D)s and Mx(A2D)s correlated significantly positive with drought tolerance, and Mx(PH)s correlated negatively. Drought tolerance was not associated with LAc, but correlated significantly with the LAs during late night and at dawn. Drought-tolerant genotypes had a lower LAs than drought-sensitive genotypes, thus resembling unstressed plants. The decision tree model selected Tm(A2D)s and Mx(PH)c as the most important parameters for tolerance class prediction. The model predicted sensitive genotypes more reliably than tolerant genotype and may thus complement the previously published model based on leaf metabolites/transcripts.
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Claims 8
Claim · model-written summary
Genotype by environment interaction significantly affected all parameters.
- Taxon
- potato
Solanum tuberosumt0 - Material
- Genotypee0
- Outcome
- all parameterse0
- Setting
- environmente0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Genotype × environment interaction affected all parameters significantly”
t0“in potato”
Claim · model-written summary
Tm(A2D)s correlated positively with drought tolerance.
- Taxon
- potatoSolanum tuberosumt0
- Material
- Tm(A2D)se0
- Outcome
- drought tolerancee0
- Direction
- positivee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tm(A2D)s and Mx(A2D)s correlated significantly positive with drought tolerance”
t0“in potato”
Claim · model-written summary
Mx(A2D)s correlated positively with drought tolerance.
- Taxon
- potatoSolanum tuberosumt0
- Material
- Mx(A2D)se0
- Outcome
- drought tolerancee0
- Direction
- positivee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tm(A2D)s and Mx(A2D)s correlated significantly positive with drought tolerance”
t0“in potato”
Claim · model-written summary
Mx(PH)s correlated negatively with drought tolerance.
- Taxon
- potatoSolanum tuberosumt0
- Material
- Mx(PH)se0
- Outcome
- drought tolerancee0
- Direction
- negativelye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tm(A2D)s and Mx(A2D)s correlated significantly positive with drought tolerance, and Mx(PH)s correlated negatively”
t0“in potato”
Claim · model-written summary
Drought tolerance was not associated with LAc.
- Taxon
- potatoSolanum tuberosumt0
- Material
- LAce0
- Outcome
- Drought tolerancee0
- Direction
- not associatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought tolerance was not associated with LAc”
t0“in potato”
Claim · model-written summary
Drought-tolerant genotypes had lower LAs than drought-sensitive genotypes.
- Taxon
- potatoSolanum tuberosumt0
- Material
- Drought-tolerant genotypese0
- Outcome
- LAse0
- Direction
- lowere0
- Comparator
- drought-sensitive genotypese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought-tolerant genotypes had a lower LAs than drought-sensitive genotypes, thus resembling unstressed plants”
t0“in potato”
Claim · model-written summary
A decision tree selected Tm(A2D)s and Mx(PH)c as the most important predictors.
- Taxon
- potatoSolanum tuberosumt0
- Outcome
- tolerance class predictione0
- Comparator
- Tm(A2D)s and Mx(PH)ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The decision tree model selected Tm(A2D)s and Mx(PH)c as the most important parameters for tolerance class prediction”
t0“in potato”
Claim · model-written summary
The model predicted sensitive genotypes more reliably than tolerant genotype.
- Taxon
- potatoSolanum tuberosumt0
- Outcome
- predicted sensitive genotypese0
- Direction
- more reliablye0
- Comparator
- tolerant genotypee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The model predicted sensitive genotypes more reliably than tolerant genotype”
t0“in potato”