Abstract
ABSTRACT Supplemental far‐red (FR) illumination of light‐grown grass seedlings inhibits tiller production while enhancing leaf elongation. Although much is known about FR enhancement of internode elongation in dicots, relatively little research has been conducted to determine the effects of FR on monocot development. In growth chamber experiments, fibre optics were used to direct supplemental FR to elongating leaf blades, main stem bases and mature leaf blades of light‐grown barley ( Hordeum vulgare L.) seedlings. Our objective was to identify specific sites of perception for FR enhancement of leaf elongation and inhibition of tiller production, and to assess potential FR effects on tiller senescence. Far‐red illumination of elongating leaves or of the main stem base reduced the total number of tillers per plant, primarily by reducing secondary and tertiary tiller production, and enhanced leaf elongation. However, leaf elongation was less sensitive to stem base treatments than to illumination of the elongating blade. Increased leaf length resulted from increased leaf elongation rate, while the duration of leaf elongation was unaffected. Exposure of mature leaf blades to FR had no effect on tillering or leaf elongation. None of the FR treatments led to tiller senescence. Localization of FR perception in vertically oriented tissues such as elongating blades and stem bases permits early detection of reflected light from neighbouring plants, allowing rapid response to impending competition.
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Claims 10
Claim · model-written summary
FR at elongating leaves reduced tiller number.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaret0 - Treatment
- Far‐red illumination of elongating leavese0
- Outcome
- total number of tillers per plante0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Far‐red illumination of elongating leaves or of the main stem base reduced the total number of tillers per plant, primarily by reducing secondary and tertiary tiller production, and enhanced leaf elongation.”
t0“barley”
Claim · model-written summary
FR at the main stem base reduced tiller number.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- Far‐red illumination of elongating leaves or of the main stem basee0
- Outcome
- total number of tillers per plante0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Far‐red illumination of elongating leaves or of the main stem base reduced the total number of tillers per plant, primarily by reducing secondary and tertiary tiller production, and enhanced leaf elongation.”
t0“barley”
Claim · model-written summary
FR at elongating leaves enhanced leaf elongation.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- Far‐red illumination of elongating leavese0
- Outcome
- leaf elongatione0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Far‐red illumination of elongating leaves or of the main stem base reduced the total number of tillers per plant, primarily by reducing secondary and tertiary tiller production, and enhanced leaf elongation.”
t0“barley”
Claim · model-written summary
FR at the stem base enhanced leaf elongation.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- main stem basee0
- Outcome
- leaf elongatione0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Far‐red illumination of elongating leaves or of the main stem base reduced the total number of tillers per plant, primarily by reducing secondary and tertiary tiller production, and enhanced leaf elongation.”
t0“barley”
Claim · model-written summary
Stem base FR affected elongation less than elongating blade FR.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- stem base treatmentse0
- Outcome
- leaf elongatione0
- Direction
- less sensitivee0
- Comparator
- illumination of the elongating bladee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“However, leaf elongation was less sensitive to stem base treatments than to illumination of the elongating blade.”
t0“barley”
Claim · model-written summary
Increased leaf length arose from higher elongation rate.
- Taxon
- barleyHordeum vulgaret0
- Outcome
- Increased leaf lengthe0
- Qualifier
- increased leaf elongation ratee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increased leaf length resulted from increased leaf elongation rate, while the duration of leaf elongation was unaffected.”
t0“barley”
Claim · model-written summary
Leaf elongation duration was unaffected.
- Taxon
- barleyHordeum vulgaret0
- Outcome
- duration of leaf elongatione0
- Direction
- unaffectede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increased leaf length resulted from increased leaf elongation rate, while the duration of leaf elongation was unaffected.”
t0“barley”
Claim · model-written summary
FR on mature blades had no effect on tillering or leaf elongation.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- Exposure of mature leaf blades to FRe0
- Outcome
- tillering or leaf elongatione0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exposure of mature leaf blades to FR had no effect on tillering or leaf elongation.”
t0“barley”
Claim · model-written summary
No FR treatment caused tiller senescence.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- FR treatmentse0
- Outcome
- tiller senescencee0
- Direction
- Nonee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“None of the FR treatments led to tiller senescence.”
t0“barley”
Claim · model-written summary
Vertically oriented FR perception may permit early detection of neighbour light.
- Taxon
- barleyHordeum vulgaret0
- Outcome
- early detection of reflected light from neighbouring plantse0
- Qualifier
- Localization of FR perception in vertically oriented tissues such as elongating blades and stem basese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Localization of FR perception in vertically oriented tissues such as elongating blades and stem bases permits early detection of reflected light from neighbouring plants, allowing rapid response to impending competition.”
t0“barley”
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See all 37 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.