Abstract
Phaseolus vulgaris plants with expanding primary leaves were subjected to dark-light or light-dark transition at a root temperature of 25 °C, or to root cooling to 10 °C. Illumination or darkening caused rapid changes in water flux through the plants and in epidermal turgor pressure when analysed by pressure probe. However, these were not concurrent with variations in bulk leaf water potential and turgor pressure as determined by the pressure chamber method. In addition, the turgor pressure of epidermis measured with the pressure probe was invariably 0.05 to 0.15 MPa lower than that measured in bulk tissue with the pressure chamber. Cooling roots to 10°C induced water stress and wilting. Both techniques indicated a decrease of turgor pressure, but a 20-30 min lag was observed with the pressure chamber. Due to stomatal closure and decreased transpiration, root-cooled plants regained cell turgor after 5-7 h of cooling, but bulk tissue and epidermal turgor (as well as leaf growth rate) remained significantly lower than control levels. These findings indicate that changes in turgor pressure as the result of hydraulic signalling are sufficient to explain the rapid changes in growth rate following illumination or cooling reported in earlier work (Sattin et al 1990). They also indicate that data obtained by use of the pressure chamber must be treated with caution.
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Claims 8
Claim · model-written summary
Cooling roots to 10°C decreased turgor pressure of bean leaves relative to control, with a 20-30 min lag in the pressure chamber.
- Taxon
- Phaseolus vulgaris
Phaseolus vulgarise0 - Treatment
- Cooling roots to 10°Ce1
- Outcome
- turgor pressuree3
- Direction
- decreasee3
- Qualifier
- a 20-30 min lag was observed with the pressure chambere4
- Comparator
- control levelse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phaseolus vulgaris plants with expanding primary leaves”
e1“Cooling roots to 10°C induced water stress and wilting”
e2“bulk tissue and epidermal turgor (as well as leaf growth rate) remained significantly lower than control levels”
e3“Both techniques indicated a decrease of turgor pressure”
e4“a 20-30 min lag was observed with the pressure chamber”
Claim · model-written summary
Illumination or darkening caused rapid changes in epidermal turgor pressure and water flux of bean plants.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Treatment
- Illumination or darkeninge5
- Outcome
- epidermal turgor pressuree5
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phaseolus vulgaris plants with expanding primary leaves”
e5“Illumination or darkening caused rapid changes in water flux through the plants and in epidermal turgor pressure when analysed by pressure probe”
Claim · model-written summary
Epidermal turgor measured with the pressure probe was 0.05 to 0.15 MPa lower than bulk-tissue turgor measured with the pressure chamber.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Outcome
- turgor pressure of epidermise6
- Direction
- lowere6
- Value
- 0.05 to 0.15 MPae6
- Comparator
- bulk tissuee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phaseolus vulgaris plants with expanding primary leaves”
e6“the turgor pressure of epidermis measured with the pressure probe was invariably 0.05 to 0.15 MPa lower than that measured in bulk tissue with the pressure chamber”
Claim · model-written summary
Root-cooled bean plants regained cell turgor after 5-7 h of cooling.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Treatment
- root-cooled plantse7
- Outcome
- cell turgore7
- Direction
- regainede7
- Qualifier
- after 5-7 h of coolinge7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phaseolus vulgaris plants with expanding primary leaves”
e7“root-cooled plants regained cell turgor after 5-7 h of cooling”
Claim · model-written summary
Under root cooling to 10°C, bulk tissue and epidermal turgor remained significantly lower than control levels.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Treatment
- Cooling roots to 10°Ce1
- Outcome
- bulk tissue and epidermal turgore2
- Direction
- lowere2
- Comparator
- control levelse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phaseolus vulgaris plants with expanding primary leaves”
e1“Cooling roots to 10°C induced water stress and wilting”
e2“bulk tissue and epidermal turgor (as well as leaf growth rate) remained significantly lower than control levels”
Claim · model-written summary
Under root cooling to 10°C, leaf growth rate remained significantly lower than control levels.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Treatment
- Cooling roots to 10°Ce1
- Outcome
- leaf growth ratee2
- Direction
- lowere2
- Comparator
- control levelse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phaseolus vulgaris plants with expanding primary leaves”
e1“Cooling roots to 10°C induced water stress and wilting”
e2“bulk tissue and epidermal turgor (as well as leaf growth rate) remained significantly lower than control levels”
Claim · model-written summary
Changes in turgor pressure from hydraulic signalling are sufficient to explain the rapid changes in growth rate after illumination or cooling.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Outcome
- rapid changes in growth ratee6
- Qualifier
- changes in turgor pressure as the result of hydraulic signallinge6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phaseolus vulgaris plants with expanding primary leaves”
e6“changes in turgor pressure as the result of hydraulic signalling are sufficient to explain the rapid changes in growth rate following illumination or cooling”
Claim · model-written summary
Data obtained with the pressure chamber must be treated with caution.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Outcome
- data obtained by use of the pressure chambere7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phaseolus vulgaris plants with expanding primary leaves”
e7“data obtained by use of the pressure chamber must be treated with caution”
The same questions in other papers
processing · growth · Phaseolus vulgaris (common bean)Positive and negative results
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- positive
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See all 13 papers →processing · physiology: water · Phaseolus vulgaris (common bean)Results agree
1 paper in the same direction as this paper
- 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.