Abstract
Field studies were conducted in 1986 and 1987 to evaluate the potential of using canopy temperature measurements to evaluate the relative drought tolerance of potato genotypes. In both years, 14 potato genotypes representing a relatively wide range of Solarium tuberosum L. germplasm were grown under well-watered [irrigation ≈100% potential evapotranspiration (ET) and stressed (irrigation ≈40% to 50% potential ET) coditions. Irrigation differences were imposed with a line source irrigation system. Canopy temperatures of the 14 genotypes were measured between 0900 and 1430 hr on 7 clear days during tuber bulking. A general linear relationship between canopy minus air temperature (ΔT) and air vapor pressure deficit (VPD) was determined for each year by regressing all ΔT data onto corresponding VPD values. The relative sensitivity of each genotype to changes in VPD was determined by regressing observed ΔT values onto the estimated ΔT from the general equation for that year. Genotypes with higher than average temperatures under well-watered conditions were generally less sensitive to changes in VPD than those with lower than average temperatures. Warmer genotypes under well-watered conditions were also generally less susceptible to drought than cooler genotypes. Thus, ΔT measurements from well-watered plots can be effectively used to assess the relative drought tolerance of potato genotypes.
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Claims 4
Claim · model-written summary
Canopy-air temperature had a general linear relationship with vapor pressure deficit in each year.
- Taxon
- Potato
Solanum tuberosumt0 - Outcome
- general linear relationshipe0
- Setting
- each yeare0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A general linear relationship between canopy minus air temperature (ΔT) and air vapor pressure deficit (VPD) was determined for each year”
t0“Potato”
Claim · model-written summary
Warm genotypes under good watering were less sensitive to changes in vapor pressure deficit.
- Taxon
- PotatoSolanum tuberosumt0
- Material
- Genotypes with higher than average temperaturese0
- Outcome
- sensitive to changes in VPDe0
- Direction
- lesse0
- Comparator
- those with lower than average temperaturese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Genotypes with higher than average temperatures under well-watered conditions were generally less sensitive to changes in VPD than those with lower than average temperatures.”
t0“Potato”
Claim · model-written summary
Warm genotypes under good watering were less susceptible to drought.
- Taxon
- PotatoSolanum tuberosumt0
- Material
- Warmer genotypese0
- Outcome
- susceptible to droughte0
- Direction
- lesse0
- Comparator
- cooler genotypese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Warmer genotypes under well-watered conditions were also generally less susceptible to drought than cooler genotypes.”
t0“Potato”
Claim · model-written summary
Canopy-air temperature in well-watered plots effectively assessed relative potato drought tolerance.
- Taxon
- potatoSolanum tuberosume0
- Outcome
- effectively used to assess the relative drought tolerancee0
- Comparator
- well-watered plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Thus, ΔT measurements from well-watered plots can be effectively used to assess the relative drought tolerance of potato genotypes.”