Abstract
The first trifoliate of soybean was shaded when fully expanded, while the plant remained in high light; a situation representative for plants growing in a closed crop. Leaf mass and respiration rate per unit area declined sharply in the first few days upon shading and remained rather constant during the further 12 days of the shading treatment. Leaf nitrogen per unit area decreased gradually until the leaves were shed. Leaf senescence was enhanced by the shading treatment in contrast to control plants growing in low light. Shaded leaves on plants grown at low nutrient availability senesced earlier than shaded leaves on plants grown at high nutrient availability. The light saturated rate of photosynthesis decreased also gradually during the shading treatment, but somewhat faster than leaf N, whereas chlorophyll contents declined somewhat slower than leaf N. Partitioning of N in the leaf over main photosynthetic functions was estimated from parameters derived from the response of photosynthesis to CO 2 . It appeared that the N exported from the leaf was more at the expense of compounds that make up photosynthetic capacity than of those involved in photon absorption, resulting in a change in partitioning of N within the photosynthetic apparatus. Photosynthetic nitrogen use efficiency increased during the shading treatment, which was for the largest part due to the decrease in leaf N content, to some extent to the decrease in respiration rate and only for a small part to change in partitioning of N within the photosynthetic apparatus.
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Claims 9
Claim · model-written summary
Leaf mass and respiration per area declined sharply initially after shading, then remained rather constant for 12 more days.
- Taxon
- soybean plants
Glycine maxt0 - Treatment
- shading treatmente0
- Outcome
- Leaf mass and respiration rate per unit areae0
- Direction
- declined sharplye0
- Qualifier
- in the first few days upon shading and remained rather constant during the further 12 dayse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf mass and respiration rate per unit area declined sharply in the first few days upon shading and remained rather constant during the further 12 days of the shading treatment.”
t0“soybean plants”
Claim · model-written summary
Leaf nitrogen per unit area gradually decreased until shaded soybean leaves were shed.
- Taxon
- soybeanGlycine maxe1
- Treatment
- shadede1
- Outcome
- Leaf nitrogen per unit areae0
- Direction
- decreasede0
- Qualifier
- until the leaves were shede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf nitrogen per unit area decreased gradually until the leaves were shed.”
t0“soybean plants”
e1“The first trifoliate of soybean was shaded”
Claim · model-written summary
Shading enhanced leaf senescence relative to low-light control plants.
- Taxon
- soybean plantsGlycine maxt0
- Treatment
- shading treatmente0
- Outcome
- Leaf senescencee0
- Direction
- enhancede0
- Comparator
- control plants growing in low lighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf senescence was enhanced by the shading treatment in contrast to control plants growing in low light.”
t0“soybean plants”
Claim · model-written summary
Shaded leaves under low nutrient availability senesced earlier than shaded leaves under high nutrient availability.
- Taxon
- soybean plantsGlycine maxt0
- Treatment
- low nutrient availabilitye0
- Outcome
- senescede0
- Direction
- earliere0
- Comparator
- high nutrient availabilitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shaded leaves on plants grown at low nutrient availability senesced earlier than shaded leaves on plants grown at high nutrient availability.”
t0“soybean plants”
Claim · model-written summary
Light-saturated photosynthesis declined gradually during shading, somewhat faster than leaf nitrogen.
- Taxon
- soybean plantsGlycine maxt0
- Treatment
- shading treatmente0
- Outcome
- light saturated rate of photosynthesise0
- Direction
- decreasede0
- Qualifier
- somewhat faster than leaf Ne0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The light saturated rate of photosynthesis decreased also gradually during the shading treatment, but somewhat faster than leaf N”
t0“soybean plants”
Claim · model-written summary
Chlorophyll contents declined during shading more slowly than leaf nitrogen.
- Taxon
- soybean plantsGlycine maxt0
- Treatment
- shading treatmente1
- Outcome
- chlorophyll contentse0
- Direction
- declinede0
- Qualifier
- somewhat slower than leaf Ne0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“chlorophyll contents declined somewhat slower than leaf N.”
t0“soybean plants”
e1“during the shading treatment, but somewhat faster than leaf N, whereas chlorophyll contents declined”
Claim · model-written summary
Exported leaf nitrogen came more from photosynthetic-capacity compounds than photon-absorption compounds, changing nitrogen partitioning.
- Taxon
- soybean plantsGlycine maxt0
- Outcome
- change in partitioning of N within the photosynthetic apparatuse0
- Qualifier
- more at the expense of compounds that make up photosynthetic capacity than of those involved in photon absorptione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the N exported from the leaf was more at the expense of compounds that make up photosynthetic capacity than of those involved in photon absorption, resulting in a change in partitioning of N within the photosynthetic apparatus.”
t0“soybean plants”
Claim · model-written summary
Photosynthetic nitrogen use efficiency increased during shading.
- Taxon
- soybean plantsGlycine maxt0
- Treatment
- shading treatmente0
- Outcome
- Photosynthetic nitrogen use efficiencye0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Photosynthetic nitrogen use efficiency increased during the shading treatment”
t0“soybean plants”
Claim · model-written summary
The increase in photosynthetic nitrogen use efficiency was attributed mainly to declining leaf nitrogen, partly to lower respiration, and only slightly to nitrogen repartitioning.
- Taxon
- soybean plantsGlycine maxt0
- Outcome
- Photosynthetic nitrogen use efficiencye1
- Qualifier
- decrease in leaf N content, to some extent to the decrease in respiration rate and only for a small part to change in partitioning of N within the photosynthetic apparatuse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“which was for the largest part due to the decrease in leaf N content, to some extent to the decrease in respiration rate and only for a small part to change in partitioning of N within the photosynthetic apparatus.”
e1“Photosynthetic nitrogen use efficiency increased during the shading treatment”
t0“soybean plants”
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See all 15 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.