Abstract
Screening a diverse set of cotton genotypes for heat tolerance may enable identification of superior germplasm for inclusion in future breeding programs. This study used a multilevel approach to assess whether cultivar differences in biochemistry reflected physiology or yield performance under high temperature environments for high yielding genotypes. Membrane integrity and enzyme viability were determined for genotypes Sicot 53, Sicala 45, Sicala V‐2, and CSX 99209‐376 subjected to high water bath temperatures. The temperature for 50% membrane integrity was lowest for Sicala 45 (temperature [°C] at which 50% relative electrical conductivity occurred [T 50 ] = 39.3°C) and enzyme viability was highest for Sicot 53 (spectrophotometric absorbance at 530 nm at a specific water bath temperature [Abs t ] = 1.1) compared with the other genotypes (T 50 = 43.7–44.7°C and Abs t = 0.6–0.7), indicating relative heat tolerance was higher for Sicot 53 and lower for Sicala 45. To validate this approach in the field, Sicot 53 and Sicala 45 were evaluated for yield, gas exchange, and fluorescence under high temperature tents. Sicot 53 outperformed Sicala 45 under tents. Yield and fruit retention decreased to a greater extent, photosynthesis and electron transport rate (ETR) were lower and stomatal conductance and transpiration were higher for Sicala 45 compared with Sicot 53 under tents. Electron transport rate, membrane integrity, and enzyme viability were the most rapid and reliable screens for heat tolerance, and the utility of these screens were enhanced by incorporation into a multilevel plant screening model encompassing both laboratory and field based components.
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Claims 7
Claim · model-written summary
Sicala 45 had the lowest temperature for 50% membrane integrity under high water bath temperatures, indicating lower heat tolerance than the other genotypes.
- Taxon
- cotton
Gossypium hirsutume0 - Material
- Sicala 45e2
- Treatment
- high water bath temperaturese1
- Outcome
- temperature for 50% membrane integritye2
- Direction
- loweste2
- Value
- 39.3°Ce2
- Comparator
- other genotypese3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Screening a diverse set of cotton genotypes for heat tolerance”
e1“subjected to high water bath temperatures”
e2“The temperature for 50% membrane integrity was lowest for Sicala 45 (temperature [°C] at which 50% relative electrical conductivity occurred [T 50 ] = 39.3°C)”
e3“compared with the other genotypes (T 50 = 43.7–44.7°C and Abs t = 0.6–0.7)”
Claim · model-written summary
Sicot 53 had the highest enzyme viability under high water bath temperatures, indicating higher heat tolerance than the other genotypes.
- Taxon
- cottonGossypium hirsutume0
- Material
- Sicot 53e4
- Treatment
- high water bath temperaturese1
- Outcome
- enzyme viabilitye4
- Direction
- higheste4
- Value
- 1.1e4
- Comparator
- other genotypese3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Screening a diverse set of cotton genotypes for heat tolerance”
e1“subjected to high water bath temperatures”
e3“compared with the other genotypes (T 50 = 43.7–44.7°C and Abs t = 0.6–0.7)”
e4“enzyme viability was highest for Sicot 53 (spectrophotometric absorbance at 530 nm at a specific water bath temperature [Abs t ] = 1.1)”
Claim · model-written summary
Yield and fruit retention decreased to a greater extent in Sicala 45 than in Sicot 53 under high temperature tents in the field.
- Taxon
- cottonGossypium hirsutume0
- Material
- Sicala 45e5
- Treatment
- high temperature tentse7
- Outcome
- Yield and fruit retentione6
- Direction
- decreased to a greater extente6
- Comparator
- Sicot 53e5
- Setting
- fielde7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Screening a diverse set of cotton genotypes for heat tolerance”
e5“Sicot 53 outperformed Sicala 45 under tents”
e6“Yield and fruit retention decreased to a greater extent”
e7“To validate this approach in the field, Sicot 53 and Sicala 45 were evaluated for yield, gas exchange, and fluorescence under high temperature tents”
Claim · model-written summary
Sicot 53 outperformed Sicala 45 under high temperature tents.
- Taxon
- cottonGossypium hirsutume0
- Material
- Sicot 53e5
- Treatment
- high temperature tentse7
- Outcome
- outperformede5
- Direction
- outperformede5
- Comparator
- Sicala 45e5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Screening a diverse set of cotton genotypes for heat tolerance”
e5“Sicot 53 outperformed Sicala 45 under tents”
e7“To validate this approach in the field, Sicot 53 and Sicala 45 were evaluated for yield, gas exchange, and fluorescence under high temperature tents”
Claim · model-written summary
Photosynthesis and electron transport rate were lower in Sicala 45 than in Sicot 53 under high temperature tents.
- Taxon
- cottonGossypium hirsutume0
- Material
- Sicala 45e5
- Treatment
- high temperature tentse3
- Outcome
- photosynthesis and electron transport rate (ETR)e7
- Direction
- lowere7
- Comparator
- Sicot 53e5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Screening a diverse set of cotton genotypes for heat tolerance”
e5“Sicot 53 outperformed Sicala 45 under tents”
e7“photosynthesis and electron transport rate (ETR) were lower”
e3“To validate this approach in the field, Sicot 53 and Sicala 45 were evaluated for yield, gas exchange, and fluorescence under high temperature tents”
Claim · model-written summary
Stomatal conductance and transpiration were higher in Sicala 45 than in Sicot 53 under high temperature tents.
- Taxon
- cottonGossypium hirsutume0
- Material
- Sicala 45e2
- Treatment
- high temperature tentse3
- Outcome
- stomatal conductance and transpiratione2
- Direction
- highere2
- Comparator
- Sicot 53e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Screening a diverse set of cotton genotypes for heat tolerance”
e2“stomatal conductance and transpiration were higher for Sicala 45 compared with Sicot 53”
e3“To validate this approach in the field, Sicot 53 and Sicala 45 were evaluated for yield, gas exchange, and fluorescence under high temperature tents”
Claim · model-written summary
Electron transport rate, membrane integrity and enzyme viability were the most rapid and reliable screens for heat tolerance in cotton.
- Outcome
- most rapid and reliable screens for heat tolerancee1
Not reportedComparator
Verbatim
e0“Screening a diverse set of cotton genotypes for heat tolerance”
e1“Electron transport rate, membrane integrity, and enzyme viability were the most rapid and reliable screens for heat tolerance”
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