Abstract
Theory outlining a general relationship between stress experienced by an organism exposed to supra-optimal temperatures and daily temperature extremes is discussed. It is shown that useful nomograms relating Tmax, Tmin, Tcritical, and high temperature stress can be developed and that these nomograms are not particularly sensitive to changes in daylength (caused by changes in time of year or latitude). Sensitivity of high temperature stress to changes in Tmin is also considerably less than that to changes in Tmax, suggesting that in situations where Tmin, does not vary greatly, Tmax alone can be used as an indicator of high temperature stress. Application of these concepts is illustrated by analyses of high temperature stress in pre-emergent maize seedlings. Results show that Tmax alone can account for more than 90% of the variation in the reduction of shoot length due to the occurrence of supra-optimal temperatures.
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Claims 3
Claim · model-written summary
The developed nomograms relate daily temperatures and critical temperature to heat stress and have low sensitivity to daylength.
- Outcome
- nomograms relating Tmax, Tmin, Tcritical, and high temperature stresse0
- Comparator
- changes in daylengthe0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It is shown that useful nomograms relating Tmax, Tmin, Tcritical, and high temperature stress can be developed and that these nomograms are not particularly sensitive to changes in daylength (caused by changes in time of year or latitude).”
t0“pre-emergent maize seedlings”
Claim · model-written summary
High-temperature stress is less sensitive to minimum than maximum temperature.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sensitivity of high temperature stress to changes in Tmin is also considerably less than that to changes in Tmax”
t0“pre-emergent maize seedlings”
Claim · model-written summary
Maximum temperature alone explained more than 90% of variation in shoot-length reduction under supra-optimal temperatures.
- Treatment
- supra-optimal temperaturese0
- Outcome
- variation in the reduction of shoot lengthe0
- Value
- more than 90%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Results show that Tmax alone can account for more than 90% of the variation in the reduction of shoot length due to the occurrence of supra-optimal temperatures.”
t0“pre-emergent maize seedlings”