Abstract
Carbon dioxide uptake at the leaf surface in air and in oxygen‐free air was examined in maize ( Zea mays L.), cotton ( Gossypium hirsutum L.), and bean ( Phaseolus vulgaris L.) plants exposed to an increasing deficiency of nitrogen. Carbon assimilation in these conditions was then related to the stomatal and apparent mesophyll resistances to CO 2 transfer. Lack of nitrogen decreased carbon assimilation in all three species. Assimilation was enhanced in oxygen‐free air in cotton and beans, but little affected in maize. The inhibition of assimilation in nitrogen‐deficient plants was accompanied by an apparent increase in mesophyll resistance to CO 2 transfer, but some increase in stomatal resistance was also measured. Enhancement of carbon assimilation in oxygen‐free air was negatively associated with the apparent mesophyll resistance to CO 2 transfer. Such apparent resistances in the mesophyll may be associated with differences in dark reactions, with a light or photosynthetically‐induced respiratory pathway, as well as with CO 2 diffusion.
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Claims 6
Claim · model-written summary
Nitrogen deficiency decreased carbon assimilation in maize, cotton, and bean.
- Taxon
- maize ( Zea mays L.), cotton ( Gossypium hirsutum L.), and bean ( Phaseolus vulgaris L.)
Gossypium hirsutum
Phaseolus vulgaris
Zea mayse1 - Treatment
- Lack of nitrogene0
- Outcome
- carbon assimilatione0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lack of nitrogen decreased carbon assimilation in all three species.”
e1“maize ( Zea mays L.), cotton ( Gossypium hirsutum L.), and bean ( Phaseolus vulgaris L.) plants”
Claim · model-written summary
Oxygen-free air enhanced carbon assimilation in cotton and beans.
Not reportedComparator
Verbatim
e0“Assimilation was enhanced in oxygen‐free air in cotton and beans”
Claim · model-written summary
Oxygen-free air had little effect on carbon assimilation in maize.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Assimilation was enhanced in oxygen‐free air in cotton and beans, but little affected in maize.”
Claim · model-written summary
Nitrogen-deficient plants had increased apparent mesophyll resistance to CO2 transfer.
- Taxon
- maize ( Zea mays L.), cotton ( Gossypium hirsutum L.), and bean ( Phaseolus vulgaris L.)Gossypium hirsutumPhaseolus vulgarisZea mayse1
- Treatment
- nitrogen‐deficiente0
- Outcome
- mesophyll resistance to CO 2 transfere0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The inhibition of assimilation in nitrogen‐deficient plants was accompanied by an apparent increase in mesophyll resistance to CO 2 transfer”
e1“maize ( Zea mays L.), cotton ( Gossypium hirsutum L.), and bean ( Phaseolus vulgaris L.) plants”
Claim · model-written summary
Nitrogen-deficient plants had some increased stomatal resistance.
- Taxon
- maize ( Zea mays L.), cotton ( Gossypium hirsutum L.), and bean ( Phaseolus vulgaris L.)Gossypium hirsutumPhaseolus vulgarisZea mayse2
- Treatment
- nitrogen‐deficiente1
- Outcome
- stomatal resistancee0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but some increase in stomatal resistance was also measured.”
e1“nitrogen‐deficient plants”
e2“maize ( Zea mays L.), cotton ( Gossypium hirsutum L.), and bean ( Phaseolus vulgaris L.) plants”
Claim · model-written summary
Enhancement of carbon assimilation in oxygen-free air was negatively associated with apparent mesophyll resistance.
- Taxon
- maize ( Zea mays L.), cotton ( Gossypium hirsutum L.), and bean ( Phaseolus vulgaris L.)Gossypium hirsutumPhaseolus vulgarisZea mayse1
- Treatment
- oxygen‐free aire0
- Outcome
- carbon assimilatione0
- Direction
- negativelye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Enhancement of carbon assimilation in oxygen‐free air was negatively associated with the apparent mesophyll resistance to CO 2 transfer.”
e1“maize ( Zea mays L.), cotton ( Gossypium hirsutum L.), and bean ( Phaseolus vulgaris L.) plants”
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This paper is about lacking the nutrient, so it counts the other way round here.
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77 papers in the same direction as this paper · 18 in the opposite direction · 2 reporting no difference from an alternative
This paper is about lacking the nutrient, so it counts the other way round here.
- positive
- negative
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See all 98 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.