Abstract
Some dynamic aspects of leaf elongation in rice were studied. Under both well watered and water-deficient conditions, leaf elongation rates were 15 to 30% greater during the day than during the night. Night temperatures below 27 C limited the rate of elongation at night but when night temperatures exceeded 27 C, night elongation rates exceeded rates during the day. The diurnal pattern of elongation was opposite to the pattern of bulk leaf turgor which was lower during the day than at night.Superimposed on the general diurnal pattern of leaf elongation were perturbations associated with the light/dark transitions. The rate of leaf elongation declined within minutes after illumination and remained low for 15 to 60 minutes, after which rapid rates ensued. The rate of leaf elongation was transiently accelerated within minutes after transition to dark and then declined to steady night rates after 30 to 60 minutes. Removal or covering of all subtending leaves eliminated these perturbations. Irrigation during the light-induced inhibition period did not influence leaf elongation rates of well watered plants but in stressed plants, high rates of elongation resumed immediately after irrigation.The rate of elongation was accelerated by hydrostatic pressure applied to roots of intact plants. The rate of leaf elongation increased with increasing pressure to about 5 bars and then showed no further increase with increasing pressure. This suggests that the rate of water uptake normally limits the rate of leaf elongation. The response to pressure could be altered by addition of an osmoticum to the root medium and elongation occurred only when the gradient of total water potential between the substrate and elongating leaf allowed water absorption. A model of leaf expansion based on water potential gradients is proposed to explain these observations.
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Claims 16
Claim · model-written summary
Rice leaf elongation was 15 to 30% greater by day than night under both water regimes.
- Taxon
- Rice
Oryza sativat0 - Outcome
- leaf elongation ratese0
- Direction
- greatere0
- Value
- 15 to 30%e0
- Qualifier
- both well watered and water-deficient conditionse0
- Comparator
- during the nighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under both well watered and water-deficient conditions, leaf elongation rates were 15 to 30% greater during the day than during the night”
t0“Rice”
Claim · model-written summary
Night temperatures below 27 C limited rice leaf elongation at night.
- Taxon
- RiceOryza sativat0
- Treatment
- Night temperatures below 27 Ce0
- Outcome
- rate of elongatione0
- Direction
- limitede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Night temperatures below 27 C limited the rate of elongation at night”
t0“Rice”
Claim · model-written summary
At night temperatures above 27 C, rice night elongation exceeded day elongation.
- Taxon
- RiceOryza sativat0
- Outcome
- night elongation ratese0
- Direction
- exceedede0
- Qualifier
- night temperatures exceeded 27 Ce0
- Comparator
- rates during the daye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“when night temperatures exceeded 27 C, night elongation rates exceeded rates during the day”
t0“Rice”
Claim · model-written summary
Bulk leaf turgor was lower by day than night, opposite the elongation pattern.
- Taxon
- RiceOryza sativat0
- Outcome
- bulk leaf turgore0
- Direction
- lowere0
- Comparator
- at nighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“bulk leaf turgor which was lower during the day than at night”
t0“Rice”
Claim · model-written summary
Leaf elongation declined after illumination and remained low for 15 to 60 minutes.
- Taxon
- RiceOryza sativat0
- Outcome
- rate of leaf elongatione0
- Direction
- declinede0
- Value
- 15 to 60 minutese0
- Qualifier
- within minutes after illuminatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The rate of leaf elongation declined within minutes after illumination and remained low for 15 to 60 minutes”
t0“Rice”
Claim · model-written summary
After the initial illumination inhibition, rapid elongation resumed.
- Taxon
- RiceOryza sativat0
- Outcome
- rapid rates ensuede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“after which rapid rates ensued”
t0“Rice”
Claim · model-written summary
Transition to darkness transiently accelerated leaf elongation.
- Taxon
- RiceOryza sativat0
- Outcome
- rate of leaf elongatione0
- Direction
- acceleratede0
- Qualifier
- within minutes after transition to darke0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The rate of leaf elongation was transiently accelerated within minutes after transition to dark”
t0“Rice”
Claim · model-written summary
Elongation then declined to steady night rates within 30 to 60 minutes.
- Taxon
- RiceOryza sativat0
- Outcome
- night ratese0
- Direction
- declinede0
- Value
- 30 to 60 minutese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“then declined to steady night rates after 30 to 60 minutes”
t0“Rice”
Claim · model-written summary
Removal or covering of subtending leaves eliminated light transition perturbations.
- Taxon
- RiceOryza sativat0
- Treatment
- Removal or covering of all subtending leavese0
- Outcome
- perturbationse0
- Direction
- eliminatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Removal or covering of all subtending leaves eliminated these perturbations”
t0“Rice”
Claim · model-written summary
Irrigation during light induced inhibition did not change elongation in well watered plants.
- Taxon
- RiceOryza sativat0
- Treatment
- Irrigation during the light-induced inhibition periode0
- Outcome
- leaf elongation ratese0
- Direction
- did not influencee0
- Qualifier
- well watered plantse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irrigation during the light-induced inhibition period did not influence leaf elongation rates of well watered plants”
t0“Rice”
Claim · model-written summary
In stressed plants, irrigation immediately restored high elongation rates.
- Taxon
- RiceOryza sativat0
- Treatment
- irrigatione0
- Outcome
- rates of elongatione0
- Direction
- highe0
- Qualifier
- stressed plantse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in stressed plants, high rates of elongation resumed immediately after irrigation”
t0“Rice”
Claim · model-written summary
Root hydrostatic pressure accelerated elongation of intact plants.
- Taxon
- RiceOryza sativat0
- Treatment
- hydrostatic pressure applied to rootse0
- Outcome
- rate of elongatione0
- Direction
- acceleratede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The rate of elongation was accelerated by hydrostatic pressure applied to roots of intact plants”
t0“Rice”
Claim · model-written summary
Elongation increased with pressure to approximately 5 bars.
- Taxon
- RiceOryza sativat0
- Treatment
- increasing pressuree0
- Outcome
- rate of leaf elongatione0
- Direction
- increasede0
- Value
- about 5 barse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The rate of leaf elongation increased with increasing pressure to about 5 bars”
t0“Rice”
Claim · model-written summary
Elongation did not increase further above approximately 5 bars.
- Taxon
- RiceOryza sativat0
- Treatment
- increasing pressuree0
- Outcome
- no further increasee0
- Direction
- no further increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“then showed no further increase with increasing pressure”
t0“Rice”
Claim · model-written summary
Adding osmoticum to root medium altered the pressure response.
- Taxon
- RiceOryza sativat0
- Treatment
- addition of an osmoticum to the root mediume0
- Outcome
- response to pressuree0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The response to pressure could be altered by addition of an osmoticum to the root medium”
t0“Rice”
Claim · model-written summary
Leaf elongation occurred only when the water potential gradient allowed absorption.
- Taxon
- RiceOryza sativat0
- Outcome
- elongation occurrede0
- Qualifier
- gradient of total water potential between the substrate and elongating leaf allowed water absorptione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“elongation occurred only when the gradient of total water potential between the substrate and elongating leaf allowed water absorption”
t0“Rice”
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See all 291 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.