Abstract
Changes in dry matter and water-soluble carbohydrate components, especially fructan, were examined in the basal 25 mm of expanding leaf blades of tall fescue (Festuca arundinacea Schreb.) to assess their roles in plant response to water deficit. Water was withheld from vegetative plants grown in soil in controlled-environment chambers. As stress progressed, leaf elongation rate decreased sooner in the light period than it did in the dark period. The decrease in growth rate in the dark period was associated with a decrease in local relative elongation rates and a shortening of the elongation zone from about 25 mm (control) to 15 mm. Dry matter content of the leaf base increased 23% during stress, due mainly to increased water-soluble carbohydrate near the ligule and to increased water-soluble, carbohydrate-free dry matter at distal positions. Sucrose content increased 258% in the leaf base, but especially (over 4-fold) within 10 mm of the ligule. Hexose content increased 187% in the leaf base. Content of total fructan decreased to 69% of control, mostly in regions farther from the ligule. Fructan hydrolysis could account for the hexose accumulated. Stress caused the osmotic potential to decrease throughout the leaf base, but more toward the ligule. With stress there was 70% less direct contribution of low-degree-of-polymerization fructan to osmotic potential in the leaf base, but that for sucrose and hexose increased 96 and 67%, respectively. Thus, fructan metabolism is involved but fructan itself contributes only indirectly to osmotic adjustment.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 14
Claim · model-written summary
Under stress, leaf elongation rate decreased sooner in the light period than in the dark period.
- Taxon
- Tall Fescue
Lolium arundinaceumt0 - Treatment
- stresse1
- Outcome
- leaf elongation ratee1
- Direction
- decreasede1
- Qualifier
- sooner in the light periode1
- Comparator
- dark periode1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tall Fescue”
e1“As stress progressed, leaf elongation rate decreased sooner in the light period than it did in the dark period”
Claim · model-written summary
The decrease in growth rate in the dark period was associated with a decrease in local relative elongation rates.
- Taxon
- Tall FescueLolium arundinaceumt0
- Organ / stage
- elongation zonee2
- Outcome
- local relative elongation ratese2
- Direction
- decreasee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tall Fescue”
e2“The decrease in growth rate in the dark period was associated with a decrease in local relative elongation rates and a shortening of the elongation zone from about 25 mm (control) to 15 mm”
Claim · model-written summary
The elongation zone shortened from about 25 mm (control) to 15 mm.
- Taxon
- Tall FescueLolium arundinaceumt0
- Outcome
- elongation zonee2
- Direction
- shorteninge2
- Value
- 15 mme2
- Comparator
- controle2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tall Fescue”
e2“The decrease in growth rate in the dark period was associated with a decrease in local relative elongation rates and a shortening of the elongation zone from about 25 mm (control) to 15 mm”
Claim · model-written summary
Dry matter content of the leaf base increased 23% during stress.
- Taxon
- Tall FescueLolium arundinaceumt0
- Treatment
- stresse3
- Outcome
- Dry matter content of the leaf basee3
- Direction
- increasede3
- Value
- 23%e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tall Fescue”
e3“Dry matter content of the leaf base increased 23% during stress”
Claim · model-written summary
Sucrose content in the leaf base increased 258% during stress.
- Taxon
- Tall FescueLolium arundinaceumt0
- Organ / stage
- leaf basee4
- Outcome
- Sucrose contente4
- Direction
- increasede4
- Value
- 258%e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tall Fescue”
e4“Sucrose content increased 258% in the leaf base, but especially (over 4-fold) within 10 mm of the ligule”
Claim · model-written summary
Sucrose content increased by over 4-fold within 10 mm of the ligule.
- Taxon
- Tall FescueLolium arundinaceumt0
- Organ / stage
- within 10 mm of the ligulee4
- Outcome
- Sucrose contente4
- Direction
- increasede4
- Value
- over 4-folde4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tall Fescue”
e4“Sucrose content increased 258% in the leaf base, but especially (over 4-fold) within 10 mm of the ligule”
Claim · model-written summary
Hexose content in the leaf base increased 187%.
- Taxon
- Tall FescueLolium arundinaceumt0
- Organ / stage
- leaf basee5
- Outcome
- Hexose contente5
- Direction
- increasede5
- Value
- 187%e5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tall Fescue”
e5“Hexose content increased 187% in the leaf base”
Claim · model-written summary
Total fructan content decreased to 69% of control, mostly in regions farther from the ligule.
- Taxon
- Tall FescueLolium arundinaceumt0
- Organ / stage
- regions farther from the ligulee6
- Outcome
- Content of total fructane6
- Direction
- decreasede6
- Value
- 69%e6
- Comparator
- controle6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tall Fescue”
e6“Content of total fructan decreased to 69% of control, mostly in regions farther from the ligule”
Claim · model-written summary
Fructan hydrolysis could account for the hexose accumulated.
- Taxon
- Tall FescueLolium arundinaceumt0
- Outcome
- hexose accumulatede7
- Qualifier
- Fructan hydrolysise7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tall Fescue”
e7“Fructan hydrolysis could account for the hexose accumulated”
Claim · model-written summary
Stress caused the osmotic potential to decrease throughout the leaf base.
- Taxon
- Tall FescueLolium arundinaceumt0
- Organ / stage
- leaf basee0
- Treatment
- Stresse0
- Outcome
- osmotic potentiale0
- Direction
- decreasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tall Fescue”
e0“Stress caused the osmotic potential to decrease throughout the leaf base, but more toward the ligule”
Claim · model-written summary
Under stress, the direct contribution of low-degree-of-polymerization fructan to osmotic potential was 70% less in the leaf base.
- Taxon
- Tall FescueLolium arundinaceumt0
- Organ / stage
- leaf basee1
- Treatment
- stresse1
- Compound
- low-degree-of-polymerization fructane1
- Outcome
- direct contributione1
- Direction
- lesse1
- Value
- 70%e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tall Fescue”
e1“With stress there was 70% less direct contribution of low-degree-of-polymerization fructan to osmotic potential in the leaf base, but that for sucrose and hexose increased 96 and 67%, respectively”
Claim · model-written summary
Under stress, the direct contribution of sucrose to osmotic potential increased by 96.
- Taxon
- Tall FescueLolium arundinaceumt0
- Organ / stage
- leaf basee1
- Treatment
- stresse1
- Compound
- sucrosee1
- Outcome
- direct contributione1
- Direction
- increasede1
- Value
- 96e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tall Fescue”
e1“With stress there was 70% less direct contribution of low-degree-of-polymerization fructan to osmotic potential in the leaf base, but that for sucrose and hexose increased 96 and 67%, respectively”
Claim · model-written summary
Under stress, the direct contribution of hexose to osmotic potential increased by 67.
- Taxon
- Tall FescueLolium arundinaceumt0
- Organ / stage
- leaf basee1
- Treatment
- stresse1
- Compound
- hexosee1
- Outcome
- direct contributione1
- Direction
- increasede1
- Value
- 67e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tall Fescue”
e1“With stress there was 70% less direct contribution of low-degree-of-polymerization fructan to osmotic potential in the leaf base, but that for sucrose and hexose increased 96 and 67%, respectively”
Claim · model-written summary
Fructan metabolism is involved in osmotic adjustment, but fructan itself contributes only indirectly.
- Taxon
- Tall FescueLolium arundinaceumt0
- Compound
- fructane2
- Outcome
- osmotic adjustmente2
- Qualifier
- fructan itself contributes only indirectlye2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tall Fescue”
e2“Thus, fructan metabolism is involved but fructan itself contributes only indirectly to osmotic adjustment”