Abstract
A controlled environment experiment investigated whether the red:far-red (R:FR) ratio of light at the apical bud of the main stolon could alter plant morphogenesis in clonal cuttings of white clover (Trifolium repens L.) The apical bud included the apical meristem, five to six developing leaf primordia with associated axillary bud primordia and stipules and the first emerged folded leaf until development was greater than 0·3 on the Carlson scale. Three light regimes were imposed on the apical bud by collimating light from R or FR light-emitting diodes so that the R:FR ratio of light incident at the apical bud was set at 0·25, 1·6 or 2·1, without significantly altering photosynthetically active radiation. The effect of these light regimes on white clover seedling growth was also tested. At a low R:FR ratio seedling hypocotyl and cotyledon lengths were significantly longer. However, with the cuttings, the light treatments did not alter node appearance rate or internode length of the main stolon, petiole length, area of leaves or total shoot dry matter. There was one significant photomorphogenetic response in the cuttings, a delay of 0·5 of a phyllochron in the appearance of branches from axillary buds in the low R:FR ratio treatment relative to the other treatments. Where branch appearance was delayed plants had fewer branches. This difference could be ascribed solely to a delay in branch appearance as there were no significant treatment effects on either the initiation of axillary bud primordia within the apical bud, the probability of branching or on the rate of growth of branches after appearance. Because treatment of the apical bud induced only one of the many previously observed responses of white clover to a decrease in the R:FR ratio of light, we conclude that other plant organs must also sense the quality of incident light.Copyright 1994, 1999 Academic Press
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Claims 7
Claim · model-written summary
Low R:FR light made seedling hypocotyls and cotyledons significantly longer in white clover.
- Taxon
- white clover
Trifolium repense0 - Organ / stage
- seedlinge1
- Treatment
- low R:FR ratioe1
- Outcome
- seedling hypocotyl and cotyledon lengthse1
- Direction
- longere1
- Setting
- controlled environmente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A controlled environment experiment investigated whether the red:far-red (R:FR) ratio of light at the apical bud of the main stolon could alter plant morphogenesis in clonal cuttings of white clover (Trifolium repens L.)”
e1“At a low R:FR ratio seedling hypocotyl and cotyledon lengths were significantly longer”
Claim · model-written summary
Light treatments at the apical bud did not alter node appearance rate or internode length of the main stolon in white clover cuttings.
- Taxon
- white cloverTrifolium repense0
- Material
- clonal cuttingse0
- Treatment
- light treatmentse2
- Outcome
- node appearance rate or internode length of the main stolone2
- Direction
- did not altere2
- Setting
- controlled environmente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A controlled environment experiment investigated whether the red:far-red (R:FR) ratio of light at the apical bud of the main stolon could alter plant morphogenesis in clonal cuttings of white clover (Trifolium repens L.)”
e2“with the cuttings, the light treatments did not alter node appearance rate or internode length of the main stolon, petiole length, area of leaves or total shoot dry matter”
Claim · model-written summary
Light treatments at the apical bud did not alter petiole length, leaf area or total shoot dry matter in white clover cuttings.
- Taxon
- white cloverTrifolium repense0
- Material
- clonal cuttingse0
- Treatment
- light treatmentse2
- Outcome
- petiole length, area of leaves or total shoot dry mattere2
- Direction
- did not altere2
- Setting
- controlled environmente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A controlled environment experiment investigated whether the red:far-red (R:FR) ratio of light at the apical bud of the main stolon could alter plant morphogenesis in clonal cuttings of white clover (Trifolium repens L.)”
e2“with the cuttings, the light treatments did not alter node appearance rate or internode length of the main stolon, petiole length, area of leaves or total shoot dry matter”
Claim · model-written summary
The low R:FR treatment delayed the appearance of axillary branches by 0.5 phyllochron relative to the other treatments.
- Taxon
- white cloverTrifolium repense0
- Treatment
- low R:FR ratioe3
- Outcome
- appearance of branches from axillary budse3
- Direction
- delaye3
- Value
- 0·5 of a phyllochrone3
- Comparator
- the other treatmentse3
- Setting
- controlled environmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A controlled environment experiment investigated whether the red:far-red (R:FR) ratio of light at the apical bud of the main stolon could alter plant morphogenesis in clonal cuttings of white clover (Trifolium repens L.)”
e3“a delay of 0·5 of a phyllochron in the appearance of branches from axillary buds in the low R:FR ratio treatment relative to the other treatments”
Claim · model-written summary
In white clover, plants whose branch appearance was delayed had fewer branches.
- Taxon
- white cloverTrifolium repense0
- Treatment
- branch appearance was delayede4
- Outcome
- branchese4
- Direction
- fewere4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A controlled environment experiment investigated whether the red:far-red (R:FR) ratio of light at the apical bud of the main stolon could alter plant morphogenesis in clonal cuttings of white clover (Trifolium repens L.)”
e4“Where branch appearance was delayed plants had fewer branches”
Claim · model-written summary
Light regimes at the apical bud had no significant effect on axillary bud primordia initiation, branching probability or branch growth rate in white clover.
- Taxon
- white cloverTrifolium repense0
- Treatment
- light regimese7
- Outcome
- the initiation of axillary bud primordia within the apical bud, the probability of branching or on the rate of growth of branches after appearancee5
- Direction
- no_changeinferrede5
- Setting
- controlled environmente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A controlled environment experiment investigated whether the red:far-red (R:FR) ratio of light at the apical bud of the main stolon could alter plant morphogenesis in clonal cuttings of white clover (Trifolium repens L.)”
e5“there were no significant treatment effects on either the initiation of axillary bud primordia within the apical bud, the probability of branching or on the rate of growth of branches after appearance”
e7“Three light regimes were imposed on the apical bud”
Claim · model-written summary
Other plant organs must also sense the quality of incident light, since the apical bud treatment induced only one of the many known responses of white clover to low R:FR.
- Taxon
- white cloverTrifolium repense0
- Outcome
- responses of white clover to a decrease in the R:FR ratio of lighte6
- Qualifier
- other plant organs must also sense the quality of incident lighte6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A controlled environment experiment investigated whether the red:far-red (R:FR) ratio of light at the apical bud of the main stolon could alter plant morphogenesis in clonal cuttings of white clover (Trifolium repens L.)”
e6“induced only one of the many previously observed responses of white clover to a decrease in the R:FR ratio of light, we conclude that other plant organs must also sense the quality of incident light”
The same questions in other papers
light · growth · Trifolium repens (white clover)Positive and negative results
4 papers in the same direction as this paper · 3 in the opposite direction
- positive
- positive
- positive
4 papers more in this group
See all 8 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.