Abstract
Growing leaves of tall fescue ( Festuca arundinacea Schreb.) were studied from emergence to a short time before the leaf ceases growth. Leaf form (width, average thickness, number of vascular bundles and height of associated ridges) and growth patterns were determined. The tissue elements produced at the point of leaf insertion are wider and thicker with time, as the intercalary meristem develops. These elements undergo further width and thickness changes as they traverse the elongation zone, and leaf width and average thickness can continue to increase after passing the elongation zone. In order to relate the generation of leaf form and dry matter (DM) deposition, three methods were used to describe DM fluxes: (1) we followed the path lines of material elements and determined that they accumulate DM as they are displaced away from leaf base, even when expansive growth and maturation are complete; (2) we calculated DM deposition on a unit length basis, which represents the total sink strength of the zone studied, and we deduced that the sink strength of the elongation zone increases with time, in concert with the changes in width and thickness of the elements that are successively produced at leaf base; (3) we calculated DM deposition on a unit volume basis, which represents the net metabolic activity of the zone considered, and we found that growth activity and associated DM deposition were high 3 d after the leaf emerged, then decreased gradually, whereas maturation and associated DM deposition were low at emergence, but increased as the leaf gradually became autotrophic. Our data indicate that different descriptors and measurements are needed during the totality of leaf growth. Copyright 1997 Annals of Botany Company
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Claims 8
Claim · model-written summary
Successive tall fescue leaf elements become wider and thicker as the intercalary meristem develops.
- Taxon
- tall fescue
Lolium arundinaceumt0 - Organ / stage
- intercalary meristeme0
- Outcome
- wider and thickere0
- Direction
- wider and thickere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The tissue elements produced at the point of leaf insertion are wider and thicker with time, as the intercalary meristem develops.”
t0“Growing leaves of tall fescue ( Festuca arundinacea Schreb.)”
Claim · model-written summary
Leaf elements change width and thickness in the elongation zone.
- Taxon
- tall fescueLolium arundinaceumt0
- Organ / stage
- elongation zonee0
- Outcome
- width and thickness changese0
- Direction
- changese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These elements undergo further width and thickness changes as they traverse the elongation zone”
t0“Growing leaves of tall fescue ( Festuca arundinacea Schreb.)”
Claim · model-written summary
Leaf width and average thickness can increase after the elongation zone.
- Taxon
- tall fescueLolium arundinaceumt0
- Organ / stage
- elongation zonee0
- Outcome
- leaf width and average thicknesse0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“leaf width and average thickness can continue to increase after passing the elongation zone”
t0“Growing leaves of tall fescue ( Festuca arundinacea Schreb.)”
Claim · model-written summary
Leaf elements accumulate dry matter after expansive growth and maturation finish.
- Taxon
- tall fescueLolium arundinaceumt0
- Outcome
- accumulate DMe0
- Direction
- accumulatee0
- Qualifier
- even when expansive growth and maturation are completee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“they accumulate DM as they are displaced away from leaf base, even when expansive growth and maturation are complete”
t0“Growing leaves of tall fescue ( Festuca arundinacea Schreb.)”
Claim · model-written summary
Sink strength of the leaf elongation zone rises with time.
- Taxon
- tall fescueLolium arundinaceumt0
- Organ / stage
- elongation zonee0
- Outcome
- sink strength of the elongation zonee0
- Direction
- increases with timee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the sink strength of the elongation zone increases with time, in concert with the changes in width and thickness of the elements that are successively produced at leaf base”
t0“Growing leaves of tall fescue ( Festuca arundinacea Schreb.)”
Claim · model-written summary
Growth activity and associated dry matter deposition were high three days after emergence and then declined.
- Taxon
- tall fescueLolium arundinaceumt0
- Outcome
- growth activity and associated DM depositione0
- Direction
- decreased graduallye0
- Value
- 3 de0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“growth activity and associated DM deposition were high 3 d after the leaf emerged, then decreased gradually”
t0“Growing leaves of tall fescue ( Festuca arundinacea Schreb.)”
Claim · model-written summary
Maturation and associated dry matter deposition rose as the leaf became autotrophic.
- Taxon
- tall fescueLolium arundinaceumt0
- Outcome
- maturation and associated DM depositione0
- Direction
- increasede0
- Qualifier
- as the leaf gradually became autotrophice0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“maturation and associated DM deposition were low at emergence, but increased as the leaf gradually became autotrophic”
t0“Growing leaves of tall fescue ( Festuca arundinacea Schreb.)”
Claim · model-written summary
Different descriptors and measurements are needed throughout leaf growth.
Verbatim
e0“different descriptors and measurements are needed during the totality of leaf growth”
t0“Grasses”