Abstract
High N-nutrition, high light and long photoperiod increased photosynthetic capacity (Amax) per leaf area of Raphanus sativus × raphanistrum. The effect of Amax on growth was enhanced by an increased fraction of dry matter partitioned into the shoot, resulting in a larger canopy. Low N-nutrition, low light and a short photoperiod reversed these responses. At intermediate combinations, such as low light and long photoperiod or high light and short photoperiod, Amax and the actual net photosynthesis per leaf area (A) neither correlated with the carbon uptake rate of the canopy as a whole nor with whole plant growth. A compensatory effect to growth of changes in dry matter partitioning in response to variation in photosynthetic characteristics induced by light and N-nutrition is discussed in terms of two competitive feedbacks. For growth a long photoperiod compensated for low light or low N-nutrition. The results indicate that extrapolations from rates to gains are only valid under defined environmental conditions, especially when different photoperiods and effects on leaf ontogeny are involved.
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Claims 9
Claim · model-written summary
High nitrogen increased leaf-area photosynthetic capacity.
- Taxon
- Raphanus sativus × raphanistrum
Raphanus sativuse0 - Treatment
- High N-nutritione0
- Outcome
- photosynthetic capacity (Amax) per leaf areae0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High N-nutrition, high light and long photoperiod increased photosynthetic capacity (Amax) per leaf area of Raphanus sativus × raphanistrum”
Claim · model-written summary
High light increased leaf-area photosynthetic capacity.
- Taxon
- Raphanus sativus × raphanistrumRaphanus sativuse0
- Treatment
- high lighte0
- Outcome
- photosynthetic capacity (Amax) per leaf areae0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High N-nutrition, high light and long photoperiod increased photosynthetic capacity (Amax) per leaf area of Raphanus sativus × raphanistrum”
Claim · model-written summary
Long photoperiod increased leaf-area photosynthetic capacity.
- Taxon
- Raphanus sativus × raphanistrumRaphanus sativuse0
- Treatment
- long photoperiode0
- Outcome
- photosynthetic capacity (Amax) per leaf areae0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High N-nutrition, high light and long photoperiod increased photosynthetic capacity (Amax) per leaf area of Raphanus sativus × raphanistrum”
Claim · model-written summary
Greater shoot dry matter allocation enhanced the effect of photosynthetic capacity on growth and produced a larger canopy.
- Taxon
- Raphanus sativus × raphanistrumRaphanus sativust0
- Outcome
- growthe0
- Qualifier
- increased fraction of dry matter partitioned into the shoote0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of Amax on growth was enhanced by an increased fraction of dry matter partitioned into the shoot, resulting in a larger canopy”
t0“of Raphanus sativus × raphanistrum”
Claim · model-written summary
Low nitrogen, low light and short photoperiod reversed the high-condition responses.
- Taxon
- Raphanus sativus × raphanistrumRaphanus sativust0
- Treatment
- Low N-nutrition, low light and a short photoperiode0
- Outcome
- these responsese0
- Direction
- reversede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Low N-nutrition, low light and a short photoperiod reversed these responses”
t0“of Raphanus sativus × raphanistrum”
Claim · model-written summary
At intermediate conditions, leaf photosynthetic capacity did not correlate with whole-canopy carbon uptake or plant growth.
- Taxon
- Raphanus sativus × raphanistrumRaphanus sativust0
- Treatment
- low light and long photoperiode0
- Outcome
- carbon uptake rate of the canopy as a wholee0
- Qualifier
- neither correlatede0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At intermediate combinations, such as low light and long photoperiod or high light and short photoperiod, Amax and the actual net photosynthesis per leaf area (A) neither correlated with the carbon uptake rate of the canopy as a whole nor with whole plant growth”
t0“of Raphanus sativus × raphanistrum”
Claim · model-written summary
Long photoperiod compensated growth under low light.
- Taxon
- Raphanus sativus × raphanistrumRaphanus sativust0
- Treatment
- long photoperiode0
- Outcome
- growthe0
- Direction
- compensatede0
- Comparator
- low lighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For growth a long photoperiod compensated for low light or low N-nutrition”
t0“of Raphanus sativus × raphanistrum”
Claim · model-written summary
Long photoperiod compensated growth under low nitrogen.
- Taxon
- Raphanus sativus × raphanistrumRaphanus sativust0
- Treatment
- long photoperiode0
- Outcome
- growthe0
- Direction
- compensatede0
- Comparator
- low N-nutritione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For growth a long photoperiod compensated for low light or low N-nutrition”
t0“of Raphanus sativus × raphanistrum”
Claim · model-written summary
The authors conclude that extrapolating photosynthetic rates to gains applies only under defined conditions.
- Taxon
- Raphanus sativus × raphanistrumRaphanus sativust0
- Outcome
- extrapolations from rates to gains are only valid under defined environmental conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“extrapolations from rates to gains are only valid under defined environmental conditions, especially when different photoperiods and effects on leaf ontogeny are involved”
t0“of Raphanus sativus × raphanistrum”
The same questions in other papers
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11 papers in the same direction as this paper · 16 in the opposite direction · 2 reporting no difference from an alternative
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See all 30 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.