Abstract
Water loss at minimum stomatal aperture (residual transpiration) from plant surfaces accounts for a substantial proportion of total transpiration during periods of water stress and at night. Its reduction by genetic selection has been suggested as a desirable objective in water-limited environments. To identify genetic and environmental sources of variation in residual transpiration of wheat (Triticum spp.), the effects of glaucousness, epicuticular wax, leaf age, plant height, and growth environment were determined using excised leaves. Glaucousness reduced residual transpiration by an average of 10%. Differing quantities of epicuticular wax and glaucousness in an isogenic pair of genotypes affected residual transpiration as well, the rate being 33% greater in the low wax, nonglaucous than in the high wax, glaucous line. Residual transpiration rate of flag leaves of field-grown plants increased with leaf age, particularly during the 7 d following ligule appearance. The rate of residual transpiration was greater in tall than in dwarf near-isogenic lines. Residual transpiration of leaves from plants grown in glasshouses was 44–66% lower than that of plants grown outdoors, which had a mean rate of 2.68 × 10 −5 g H 2 O cm −2 min −1 . Method of water application to glasshouse plants influenced residual transpiration rate. The rate for leaves of plants watered by spraying water onto the plant and soil surface was 20% greater than that of leaves of plants watered on the soil surface only. It was concluded that the increase in residual transpiration rate with leaf age was due to duration of exposure to the rigors of the exterior environment; the absence of this in controlled environments results in lower rates of residual transpiration than in the field.Key words: Cuticular transpiration, Triticum aestivum L., Triticum turgidum L. var. durum, wheat
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Claims 7
Claim · model-written summary
Glaucousness reduced residual transpiration of wheat leaves by an average of 10%.
- Taxon
- wheat
Triticum aestivume0 - Treatment
- Glaucousnesse1
- Outcome
- residual transpiratione1
- Direction
- reducede1
- Value
- 10%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“To identify genetic and environmental sources of variation in residual transpiration of wheat (Triticum spp.)”
e1“Glaucousness reduced residual transpiration by an average of 10%”
Claim · model-written summary
The low-wax nonglaucous wheat line had a residual transpiration rate 33% greater than the high-wax glaucous line.
- Taxon
- wheatTriticum aestivume0
- Material
- isogenic pair of genotypese3
- Treatment
- Differing quantities of epicuticular wax and glaucousnesse3
- Outcome
- residual transpiratione3
- Direction
- greatere2
- Value
- 33%e2
- Comparator
- high wax, glaucous linee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“To identify genetic and environmental sources of variation in residual transpiration of wheat (Triticum spp.)”
e2“the rate being 33% greater in the low wax, nonglaucous than in the high wax, glaucous line”
e3“Differing quantities of epicuticular wax and glaucousness in an isogenic pair of genotypes affected residual transpiration as well”
Claim · model-written summary
Residual transpiration of flag leaves of field-grown wheat increased with leaf age, particularly during the 7 days after ligule appearance.
- Taxon
- wheatTriticum aestivume0
- Organ / stage
- flag leavese4
- Treatment
- leaf agee4
- Outcome
- Residual transpiration ratee4
- Direction
- increasede4
- Qualifier
- particularly during the 7 d following ligule appearancee4
- Setting
- field-grown plantse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“To identify genetic and environmental sources of variation in residual transpiration of wheat (Triticum spp.)”
e4“Residual transpiration rate of flag leaves of field-grown plants increased with leaf age, particularly during the 7 d following ligule appearance”
Claim · model-written summary
Residual transpiration rate was greater in tall than in dwarf near-isogenic wheat lines.
- Taxon
- wheatTriticum aestivume0
- Material
- near-isogenic linese5
- Outcome
- rate of residual transpiratione5
- Direction
- greatere5
- Comparator
- dwarf near-isogenic linese5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“To identify genetic and environmental sources of variation in residual transpiration of wheat (Triticum spp.)”
e5“The rate of residual transpiration was greater in tall than in dwarf near-isogenic lines”
Claim · model-written summary
Residual transpiration of wheat leaves from glasshouse-grown plants was 44–66% lower than from outdoor-grown plants.
- Taxon
- wheatTriticum aestivume0
- Treatment
- plants grown in glasshousese6
- Outcome
- Residual transpiration of leavese6
- Direction
- lowere6
- Value
- 44–66%e6
- Comparator
- plants grown outdoorse6
- Setting
- glasshousese6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“To identify genetic and environmental sources of variation in residual transpiration of wheat (Triticum spp.)”
e6“Residual transpiration of leaves from plants grown in glasshouses was 44–66% lower than that of plants grown outdoors”
Claim · model-written summary
Spraying water onto the plant and soil surface gave 20% greater residual transpiration than watering the soil surface only.
- Taxon
- wheatTriticum aestivume0
- Treatment
- watered by spraying water onto the plant and soil surfacee7
- Outcome
- residual transpiration ratee1
- Direction
- greatere7
- Value
- 20%e7
- Comparator
- watered on the soil surface onlye7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“To identify genetic and environmental sources of variation in residual transpiration of wheat (Triticum spp.)”
e7“The rate for leaves of plants watered by spraying water onto the plant and soil surface was 20% greater than that of leaves of plants watered on the soil surface only”
e1“Method of water application to glasshouse plants influenced residual transpiration rate”
Claim · model-written summary
The increase of residual transpiration with leaf age is attributed to longer exposure of leaves to the external environment.
- Taxon
- wheatTriticum aestivume0
- Outcome
- residual transpiration rate with leaf agee1
- Qualifier
- duration of exposure to the rigors of the exterior environmente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“To identify genetic and environmental sources of variation in residual transpiration of wheat (Triticum spp.)”
e1“the increase in residual transpiration rate with leaf age was due to duration of exposure to the rigors of the exterior environment”
The same questions in other papers
application · physiology: gas exchange · Triticum aestivum (wheat)Positive and negative results
1 paper in the same direction as this paper · 21 in the opposite direction
- positive
- positive
- positive
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See all 23 papers →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.