Abstract
Abstract Raising ambient levels of CO 2 during the night, between 350 and 950cm 3 m −3 , reduced the dark respiration rate of Medicago sativum seedlings. The percentage effect was greater for maintenance respiration than for dark respiration as a whole, and when the plants were in a low photosynthate status. Twenty‐four h carbon balance studies confirmed a reduction in night time respiration and an increase of net carbon gain when night time [CO 2 ] was high. Growth experiments showed a small but significant increase of dry weight in Medicago sativum seedlings exposed to high [CO 2 ] (∼ 1200 cm 3 m −3 ) at night. This effect was greater for plants grown with Rhizobium nodules than for plants grown with nitrate in the absence of Rhizobium. A similar, but smaller and statistically non‐significant effect of high night time [CO 2 ] on growth was found for Xanthium strumarium seedlings. The significance of these findings is discussed in relation to the rising CO 2 content of the atmosphere.
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Claims 5
Claim · model-written summary
Raising night-time CO2 reduced the dark respiration rate of Medicago sativum seedlings.
- Taxon
- Medicago sativume0
- Treatment
- Raising ambient levels of CO 2 during the nighte0
- Outcome
- dark respiration ratee0
- Direction
- reducede0
Not reportedComparator
Verbatim
e0“Raising ambient levels of CO 2 during the night, between 350 and 950cm 3 m −3 , reduced the dark respiration rate of Medicago sativum seedlings”
Claim · model-written summary
High night-time CO2 increased net carbon gain in Medicago sativum in 24 h carbon balance studies.
Not reportedComparator
Verbatim
e0“Raising ambient levels of CO 2 during the night, between 350 and 950cm 3 m −3 , reduced the dark respiration rate of Medicago sativum seedlings”
e1“an increase of net carbon gain when night time [CO 2 ] was high”
Claim · model-written summary
High night-time CO2 gave a small but significant increase in dry weight of Medicago sativum seedlings.
- Taxon
- Medicago sativume0
- Treatment
- high [CO 2] (∼ 1200 cm 3 m −3 ) at nighte2
- Outcome
- dry weighte2
- Direction
- increasee2
- Qualifier
- smalle2
Not reportedComparator
Verbatim
e0“Raising ambient levels of CO 2 during the night, between 350 and 950cm 3 m −3 , reduced the dark respiration rate of Medicago sativum seedlings”
e2“Growth experiments showed a small but significant increase of dry weight in Medicago sativum seedlings exposed to high [CO 2] (∼ 1200 cm 3 m −3 ) at night”
Claim · model-written summary
The night-time CO2 effect on dry weight was greater for Medicago sativum with Rhizobium nodules than with nitrate and no Rhizobium.
- Taxon
- Medicago sativume0
- Outcome
- dry weighte2
- Direction
- greatere3
- Comparator
- plants grown with nitrate in the absence of Rhizobiume3
RhizobiumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Raising ambient levels of CO 2 during the night, between 350 and 950cm 3 m −3 , reduced the dark respiration rate of Medicago sativum seedlings”
e2“Growth experiments showed a small but significant increase of dry weight in Medicago sativum seedlings exposed to high [CO 2] (∼ 1200 cm 3 m −3 ) at night”
e3“This effect was greater for plants grown with Rhizobium nodules than for plants grown with nitrate in the absence of Rhizobium”
Claim · model-written summary
High night-time CO2 had a similar but smaller and non-significant effect on growth of Xanthium strumarium seedlings.
- Taxon
- Xanthium strumarium
Xanthium strumariume4 - Treatment
- high night time [CO2]e4
- Outcome
- growthe4
- Direction
- smallere4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“A similar, but smaller and statistically non‐significant effect of high night time [CO2] on growth was found for Xanthium strumarium seedlings”
The same questions in other papers
co2 · growth · Xanthium strumarium (cocklebur)Positive and negative results
3 papers in the same direction as this paper · 12 in the opposite direction
- positive
- positive
- positive
12 papers more in this group
See all 16 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.