Abstract
Summary Three laboratory experiments were carried out to answer certain important questions related to the use of‘photo control’as a weed–control strategy. The first experiment documented that seeds of Rumex obtusifolius L. and Silene noctiflora L. germinated more slowly in total darkness than after a short exposure to light, whereas there were no significant differences for Cerastium fontanum Baumg. This suggests that seedling emergence in total darkness would not only result in fewer seedlings, but would also be slower; hence the crop might be given a competitive advantage. The second experiment demonstrated that germination of C. fontanum and S. noctiflora showed a linear response to the logarithm of photon fluence. with levels >1 μmOl m ‐2 being stimulatory. This suggests that a near–complete elimination of light during dark harrowing would give the best result. R. obtusifolius , however, had a sigmoid dose–response curve with a lower threshold for germination at 500 μmOl m ‐2 . Hence, this species had a clear threshold under which unnecessary germination was prevented. The third experiment tested for interaction between light and nitrate in their stimulatory effect on germination percentages. For Descurainia sophia (L.) Webb ex Prantl, R. obtusifolius and Thlaspi arvense L., but not for C. fontanum . such interactions were significant. This stresses the fact that light response will vary substantially depending on the seed's environment.
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Claims 10
Claim · model-written summary
Rumex obtusifolius seeds germinated more slowly in darkness than after short light exposure.
- Taxon
- Rumex obtusifolius L.
Rumex obtusifoliuse0 - Organ / stage
- seedse0
- Treatment
- total darknesse0
- Outcome
- germinatede0
- Direction
- more slowlye0
- Comparator
- a short exposure to lighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seeds of Rumex obtusifolius L. and Silene noctiflora L. germinated more slowly in total darkness than after a short exposure to light”
Claim · model-written summary
Silene noctiflora seeds germinated more slowly in darkness than after short light exposure.
- Taxon
- Silene noctiflora L.
Silene noctiflorae0 - Organ / stage
- seedse0
- Treatment
- total darknesse0
- Outcome
- germinatede0
- Direction
- more slowlye0
- Comparator
- a short exposure to lighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seeds of Rumex obtusifolius L. and Silene noctiflora L. germinated more slowly in total darkness than after a short exposure to light”
Claim · model-written summary
Cerastium fontanum showed no significant germination difference in darkness versus short light exposure.
- Taxon
- Cerastium fontanum Baumg.
Cerastium fontanume0 - Outcome
- differencese0
- Direction
- no significant differencese0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“whereas there were no significant differences for Cerastium fontanum Baumg.”
Claim · model-written summary
Cerastium fontanum germination responded linearly to log photon fluence, with levels above 1 μmOl m ‐2 stimulatory.
- Taxon
- C. fontanumCerastium fontanume0
- Treatment
- photon fluencee0
- Outcome
- germinatione0
- Direction
- stimulatorye0
- Value
- >1 μmOl m ‐2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“germination of C. fontanum and S. noctiflora showed a linear response to the logarithm of photon fluence. with levels >1 μmOl m ‐2 being stimulatory”
Claim · model-written summary
Silene noctiflora germination responded linearly to log photon fluence, with levels above 1 μmOl m ‐2 stimulatory.
- Taxon
- S. noctifloraSilene noctiflorae0
- Treatment
- photon fluencee0
- Outcome
- germinatione0
- Direction
- stimulatorye0
- Value
- >1 μmOl m ‐2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“germination of C. fontanum and S. noctiflora showed a linear response to the logarithm of photon fluence. with levels >1 μmOl m ‐2 being stimulatory”
Claim · model-written summary
Rumex obtusifolius had a sigmoid light response with a germination threshold at 500 μmOl m ‐2.
- Taxon
- R. obtusifoliusRumex obtusifoliuse0
- Treatment
- dose–responsee0
- Outcome
- germinatione0
- Value
- 500 μmOl m ‐2e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“R. obtusifolius , however, had a sigmoid dose–response curve with a lower threshold for germination at 500 μmOl m ‐2”
Claim · model-written summary
Light and nitrate interacted significantly in Descurainia sophia germination.
- Taxon
- Descurainia sophia (L.) Webb ex Prantl
Descurainia sophiae0 - Outcome
- interactionse0
Not reportedTreatmentDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For Descurainia sophia (L.) Webb ex Prantl, R. obtusifolius and Thlaspi arvense L., but not for C. fontanum . such interactions were significant”
Claim · model-written summary
Light and nitrate interacted significantly in Rumex obtusifolius germination.
- Taxon
- R. obtusifoliusRumex obtusifoliuse0
- Outcome
- interactionse0
Not reportedTreatmentDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For Descurainia sophia (L.) Webb ex Prantl, R. obtusifolius and Thlaspi arvense L., but not for C. fontanum . such interactions were significant”
Claim · model-written summary
Light and nitrate interacted significantly in Thlaspi arvense germination.
- Taxon
- Thlaspi arvense L.
_-_Guelph%2C_Ontario_2020-04-12.jpg?width=60)
Thlaspi arvensee0 - Outcome
- interactionse0
Not reportedTreatmentDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_-_Guelph%2C_Ontario_2020-04-12.jpg?width=500)
Verbatim
e0“For Descurainia sophia (L.) Webb ex Prantl, R. obtusifolius and Thlaspi arvense L., but not for C. fontanum . such interactions were significant”
Claim · model-written summary
Cerastium fontanum showed no significant light–nitrate interaction.
- Taxon
- C. fontanumCerastium fontanume0
- Outcome
- interactionse0
Not reportedTreatmentDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For Descurainia sophia (L.) Webb ex Prantl, R. obtusifolius and Thlaspi arvense L., but not for C. fontanum . such interactions were significant”
The same questions in other papers
light · growth · Rumex obtusifolius (bitter dock)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- negative
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.