Abstract
Tillering responses to the light environment and to defoliation were studied in two populations of perennial ryegrass (Lolium perenne L.) selected for contrasting leaf lengths. The objective of this study was to determine whether differences in tillering responses between populations, as a result of management practices, affected their competitive ability. Young seedlings were exposed, under controlled conditions, to defoliation, neutral shading (decreased photosynthetic photon flux), low red : far-red ratio and\or decreased blue light. Selection for longer leaves reduced the tillering rate. After defoliation, this difference between short-and long-leaved populations was magnified. Defoliation decreased both site filling and phyllochron of the long-leaved population but had no effect on the shortleaved population. Lowering the photosynthetic photon flux reduced the phyllochron in both population. Decreasing the red : far-red ratio reduced tillering rate by reducing site filling, whereas decreasing blue light had no significant effects on tillering. Tillering responses to photosynthetic photon flux and to red : far-red ratio were similar in the two populations selected for contrasting leaf length. The implication of these tillering responses in defining the competitive ability of the grass plants is discussed in relation to their management.
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Claims 8
Claim · model-written summary
Selection for longer leaves reduced ryegrass tillering rate.
- Taxon
- perennial ryegrass
Lolium perennee1 - Material
- longer leavese0
- Outcome
- tillering ratee0
- Direction
- reducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Selection for longer leaves reduced the tillering rate.”
e1“perennial ryegrass (Lolium perenne L.)”
Claim · model-written summary
Defoliation magnified the tillering difference between short- and long-leaved populations.
- Taxon
- perennial ryegrassLolium perennee1
- Treatment
- defoliatione0
- Outcome
- differencee0
- Direction
- magnifiede0
- Comparator
- short-and long-leaved populationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After defoliation, this difference between short-and long-leaved populations was magnified.”
e1“perennial ryegrass (Lolium perenne L.)”
Claim · model-written summary
Defoliation decreased site filling and phyllochron in long-leaved ryegrass.
- Taxon
- perennial ryegrassLolium perennee1
- Material
- long-leaved populatione0
- Treatment
- Defoliatione0
- Outcome
- site filling and phyllochrone0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Defoliation decreased both site filling and phyllochron of the long-leaved population”
e1“perennial ryegrass (Lolium perenne L.)”
Claim · model-written summary
Defoliation had no effect on the short-leaved population.
- Taxon
- perennial ryegrassLolium perennee1
- Material
- shortleaved populatione0
- Treatment
- Defoliatione0
- Outcome
- site filling and phyllochrone0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Defoliation decreased both site filling and phyllochron of the long-leaved population but had no effect on the shortleaved population.”
e1“perennial ryegrass (Lolium perenne L.)”
Claim · model-written summary
Lower photon flux reduced phyllochron in both ryegrass populations.
- Taxon
- perennial ryegrassLolium perennee1
- Treatment
- Lowering the photosynthetic photon fluxe0
- Outcome
- phyllochrone0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lowering the photosynthetic photon flux reduced the phyllochron in both population.”
e1“perennial ryegrass (Lolium perenne L.)”
Claim · model-written summary
Lowering the red-to-far-red ratio reduced ryegrass tillering rate through reduced site filling.
- Taxon
- perennial ryegrassLolium perennee1
- Treatment
- Decreasing the red : far-red ratioe0
- Outcome
- tillering ratee0
- Direction
- reducede0
- Qualifier
- by reducing site fillinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Decreasing the red : far-red ratio reduced tillering rate by reducing site filling”
e1“perennial ryegrass (Lolium perenne L.)”
Claim · model-written summary
Decreasing blue light had no significant effect on ryegrass tillering.
- Taxon
- perennial ryegrassLolium perennee1
- Treatment
- decreasing blue lighte0
- Outcome
- tilleringe0
- Direction
- no significant effectse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreasing blue light had no significant effects on tillering”
e1“perennial ryegrass (Lolium perenne L.)”
Claim · model-written summary
Tillering responses to photon flux and red-to-far-red ratio were similar in the two leaf-length populations.
- Taxon
- perennial ryegrassLolium perennee1
- Outcome
- Tillering responsese0
- Direction
- similare0
- Comparator
- two populationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tillering responses to photosynthetic photon flux and to red : far-red ratio were similar in the two populations selected for contrasting leaf length.”
e1“perennial ryegrass (Lolium perenne L.)”
The same questions in other papers
light · growth · Lolium perenne (perennial ryegrass)Positive and negative results
4 papers in the same direction as this paper · 7 in the opposite direction
- positive
- positive
- positive
8 papers more in this group
See all 12 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.