Abstract
This paper describes a method for measuring the temperatures of all regions of an intact leaf by using an infrared scanning thermometer at wavelengths between 8 and 14 micrometers combined with a digital image processing system. Pictures obtained every 2 minutes from leaves of sunflower (Helianthus annuus L. cv Large Russian) plants subjected to increasing water stress showed that water deficit develops first at the margins of leaves, accompanied by stomatal closure and increase in temperature. Finally, the temperature of the entire leaf rises 3 to 5 degrees C above that of nonstressed leaves. When transpiration resumed, it did so first at the leaf margins and these proceeded nonuniformly inward.The results of these experiments indicate that there are significant differences in the temperature and water status of different parts of a leaf. This makes it important to determine causes of such behavior and decide in what part of a leaf the temperature and water status should be measured. The thermo-imaging method can be useful in monitoring short term temperature changes occurring in leaves undergoing water, chilling, and other stresses.
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Claims 5
Claim · model-written summary
Under increasing water stress, the temperature of the entire sunflower leaf rises 3 to 5 degrees C above that of nonstressed leaves.
- Taxon
- sunflower
Helianthus annuuse0 - Material
- Large Russiane0
- Organ / stage
- entire leafe1
- Treatment
- increasing water stresse0
- Outcome
- the temperature of the entire leafe1
- Direction
- risese1
- Value
- 3 to 5 degrees Ce1
- Comparator
- nonstressed leavese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Water Stress of Sunflower Leaves”
e0“leaves of sunflower (Helianthus annuus L. cv Large Russian) plants subjected to increasing water stress”
e1“Finally, the temperature of the entire leaf rises 3 to 5 degrees C above that of nonstressed leaves”
Claim · model-written summary
Under water stress, water deficit first develops at leaf margins, accompanied by stomatal closure and increased temperature.
- Taxon
- SunflowerHelianthus annuust0
- Organ / stage
- margins of leavese2
- Treatment
- increasing water stresse0
- Outcome
- water deficite2
- Qualifier
- accompanied by stomatal closure and increase in temperaturee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Water Stress of Sunflower Leaves”
e0“leaves of sunflower (Helianthus annuus L. cv Large Russian) plants subjected to increasing water stress”
e2“water deficit develops first at the margins of leaves, accompanied by stomatal closure and increase in temperature”
Claim · model-written summary
Transpiration resumed first at the leaf margins and proceeded nonuniformly inward.
- Taxon
- SunflowerHelianthus annuust0
- Organ / stage
- leaf marginse3
- Outcome
- transpiration resumede3
- Qualifier
- proceeded nonuniformly inwarde3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Water Stress of Sunflower Leaves”
e3“When transpiration resumed, it did so first at the leaf margins and these proceeded nonuniformly inward”
Claim · model-written summary
There are significant differences in temperature and water status between different parts of a sunflower leaf.
- Taxon
- SunflowerHelianthus annuust0
- Organ / stage
- different parts of a leafe4
- Outcome
- the temperature and water statuse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Water Stress of Sunflower Leaves”
e4“there are significant differences in the temperature and water status of different parts of a leaf”
Claim · model-written summary
The thermo-imaging method can be useful for monitoring short-term leaf temperature changes under water, chilling and other stresses.
- Taxon
- SunflowerHelianthus annuust0
- Outcome
- monitoring short term temperature changes occurring in leavese5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Schema note from the model: method utility statement by the authors; not a measured result and no comparator or value
Verbatim
t0“Water Stress of Sunflower Leaves”
e5“The thermo-imaging method can be useful in monitoring short term temperature changes occurring in leaves undergoing water, chilling, and other stresses”
The same questions in other papers
drought · soil: physics · Helianthus annuus (common sunflower)Results agree
3 papers in the same direction as this paper
- negative
- negative
- negative
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.