Abstract
summary Biophysical parameters controlling leaf expansion in hybrid poplar (Populus nigra L. × P. deltoides Barer, ex Marsh = P. x euramericana ) were measured for first‐year cuttings growing under controlled conditions, with or without ozone fumigation. As individual leaves expanded, leaf water potential remained constant whilst solute potential declined and turgor (P) increased from approximately 0.5 MPa to over 1.0 MPa as leaf size increased. Yield turgor (Y) measured by stress‐relaxation of leaf discs within psychrometers, increased from approximately 0.2 MPa to over 1.0 MPa during the same period. As the value of Y approached that of P, the effective turgor For growth (P – Y) declined and became zero as leaf growth ceased. Cell wall extensibility (measured as percentage plasticity by the ‘Instron’ technique) was related to leaf growth rate such that highest values of plasticity corresponded to maximum rates of growth. As growth ceased, wall extensibility declined to very law values. Fumigation with 50 nl 1 −1 ozone for 16 h d −1 had no effect on any of the measured parameters with the result that growth and mature leaf size were unaffected by comparison with control plants receiving charcoal‐filtered air. Additional episodes of 120 nl 1 −1 ozone on three consecutive days during the period of maximum leaf growth similarly had no effect on expansion or final leaf size.
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Claims 10
Claim · model-written summary
Leaf water potential stayed constant during expansion.
PopulusOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“As individual leaves expanded, leaf water potential remained constant”
t0“hybrid poplar”
Claim · model-written summary
Solute potential declined during leaf expansion.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“solute potential declined”
t0“hybrid poplar”
Claim · model-written summary
Turgor rose from about 0.5 to over 1.0 MPa with leaf size.
- Organ / stage
- leafe0
- Outcome
- turgor (P)e0
- Direction
- increasede0
- Value
- approximately 0.5 MPa to over 1.0 MPae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“turgor (P) increased from approximately 0.5 MPa to over 1.0 MPa as leaf size increased.”
t0“hybrid poplar”
Claim · model-written summary
Yield turgor increased from about 0.2 to over 1.0 MPa over the same period.
- Organ / stage
- leaf discse0
- Outcome
- Yield turgor (Y)e0
- Direction
- increasede0
- Value
- approximately 0.2 MPa to over 1.0 MPae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield turgor (Y) measured by stress‐relaxation of leaf discs within psychrometers, increased from approximately 0.2 MPa to over 1.0 MPa during the same period.”
t0“hybrid poplar”
Claim · model-written summary
Effective turgor declined to zero as leaf growth stopped.
- Organ / stage
- leafe0
- Outcome
- effective turgor For growth (P – Y)e0
- Direction
- declinede0
- Qualifier
- as leaf growth ceasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effective turgor For growth (P – Y) declined and became zero as leaf growth ceased.”
t0“hybrid poplar”
Claim · model-written summary
Highest cell wall plasticity corresponded to maximum leaf growth rate.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cell wall extensibility (measured as percentage plasticity by the ‘Instron’ technique) was related to leaf growth rate such that highest values of plasticity corresponded to maximum rates of growth.”
t0“hybrid poplar”
Claim · model-written summary
Wall extensibility declined to very low levels when growth ceased.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cell wall extensibility (measured as percentage plasticity by the ‘Instron’ technique) was related to leaf growth rate such that highest values of plasticity corresponded to maximum rates of growth. As growth ceased, wall extensibility declined to very law values.”
t0“hybrid poplar”
Claim · model-written summary
Fumigation with 50 nl 1 −1 ozone did not affect measured leaf parameters.
- Treatment
- 50 nl 1 −1 ozone for 16 h d −1e0
- Outcome
- measured parameterse0
- Direction
- no effecte0
- Comparator
- control plants receiving charcoal‐filtered aire0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fumigation with 50 nl 1 −1 ozone for 16 h d −1 had no effect on any of the measured parameters with the result that growth and mature leaf size were unaffected by comparison with control plants receiving charcoal‐filtered air.”
t0“hybrid poplar”
Claim · model-written summary
Fumigation with 50 nl 1 −1 ozone did not affect growth or mature leaf size.
- Treatment
- 50 nl 1 −1 ozone for 16 h d −1e0
- Outcome
- growth and mature leaf sizee0
- Direction
- unaffectede0
- Comparator
- control plants receiving charcoal‐filtered aire0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fumigation with 50 nl 1 −1 ozone for 16 h d −1 had no effect on any of the measured parameters with the result that growth and mature leaf size were unaffected by comparison with control plants receiving charcoal‐filtered air.”
t0“hybrid poplar”
Claim · model-written summary
Three additional 120 nl 1 −1 ozone episodes did not affect expansion or final leaf size.
- Treatment
- 120 nl 1 −1 ozone on three consecutive dayse0
- Outcome
- expansion or final leaf sizee0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Additional episodes of 120 nl 1 −1 ozone on three consecutive days during the period of maximum leaf growth similarly had no effect on expansion or final leaf size.”
t0“hybrid poplar”
The same questions in other papers
ozone · growth · Populus (poplar)Results differ
12 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- negative
10 papers more in this group
See all 14 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.