Abstract
ABSTRACT The C 4 cereal Sorghum bicolor was grown under either ambient (350 μmol mol −1 ) or elevated (700 μmol mol −1 ) [CO 2 ] in either the presence or absence of the C 3 obligate root hemi‐parasites Striga hermonthica or S. asiatica. Both uninfected and infected sorghum plants were taller and had greater biomass, photosynthetic rates, water‐use efficiencies and leaf areas under elevated compared with ambient [CO 2 ]. There was no evidence of any downregula‐tion of photosynthesis in sorghum grown at elevated [CO 2 ]. Biomass of infected sorghum was lower under both ambient and elevated [CO 2 ], and although infected plants were larger under elevated [CO 2 ] the relative impact of infection on host biomass was either the same ( S. asiatica ) or only slightly less ( S. hermonthica ) than under ambient [CO 2 ]. In contrast, biomass of S. hermonthica and S. asiatica per host was lower under elevated than ambient [CO 2 ], although rates of photosynthesis were higher at elevated [CO 2 ] and parasite stomatal conductance was not responsive to [CO 2 ]. Parasites emerged above‐ground and flowered earlier under ambient compared with elevated [CO 2 ]. It appears that the mechanism(s) by which the parasites affect host growth is (are) relatively insensitive to increased atmospheric [CO 2 ], although the parasites themselves were adversely affected by growth at elevated [CO 2 ].
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Claims 11
Claim · model-written summary
Elevated CO2 increased sorghum height, biomass and leaf area in infected and uninfected plants.
- Taxon
- Sorghum bicolor
Sorghum bicolort0 - Treatment
- elevatede0
- Outcome
- taller and had greater biomasse0
- Direction
- greatere0
- Comparator
- ambient [CO 2 ]e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sorghum bicolor”
e0“Both uninfected and infected sorghum plants were taller and had greater biomass, photosynthetic rates, water‐use efficiencies and leaf areas under elevated compared with ambient [CO 2 ]”
Claim · model-written summary
Elevated CO2 increased sorghum photosynthetic rate and water-use efficiency.
- Taxon
- Sorghum bicolorSorghum bicolort0
- Treatment
- elevatede0
- Outcome
- photosynthetic rates, water‐use efficiencies and leaf arease0
- Direction
- greatere0
- Comparator
- ambient [CO 2 ]e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sorghum bicolor”
e0“Both uninfected and infected sorghum plants were taller and had greater biomass, photosynthetic rates, water‐use efficiencies and leaf areas under elevated compared with ambient [CO 2 ]”
Claim · model-written summary
Elevated CO2 showed no evidence of photosynthetic downregulation in sorghum.
- Taxon
- Sorghum bicolorSorghum bicolort0
- Treatment
- elevated [CO 2 ]e0
- Outcome
- no evidence of any downregula‐tion of photosynthesise0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sorghum bicolor”
e0“There was no evidence of any downregula‐tion of photosynthesis in sorghum grown at elevated [CO 2 ]”
Claim · model-written summary
Striga infection reduced sorghum biomass at ambient and elevated CO2.
- Taxon
- Sorghum bicolorSorghum bicolort0
- Treatment
- infectede0
- Outcome
- Biomass of infected sorghume0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sorghum bicolor”
e0“Biomass of infected sorghum was lower under both ambient and elevated [CO 2 ]”
Claim · model-written summary
The relative host biomass impact of S. asiatica was the same under elevated and ambient CO2.
- Taxon
- Sorghum bicolorSorghum bicolort0
- Interactor
- S. asiatica
Striga asiaticae0parasite - Outcome
- relative impact of infection on host biomasse0
- Direction
- the samee0
- Comparator
- ambient [CO 2 ]e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sorghum bicolor”
e0“the relative impact of infection on host biomass was either the same ( S. asiatica ) or only slightly less ( S. hermonthica ) than under ambient [CO 2 ]”
Claim · model-written summary
The relative host biomass impact of S. hermonthica was slightly less under elevated than ambient CO2.
- Taxon
- Sorghum bicolorSorghum bicolort0
- Interactor
- S. hermonthica
Striga hermonthicae0parasite - Outcome
- relative impact of infection on host biomasse0
- Direction
- slightly lesse0
- Comparator
- ambient [CO 2 ]e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sorghum bicolor”
e0“the relative impact of infection on host biomass was either the same ( S. asiatica ) or only slightly less ( S. hermonthica ) than under ambient [CO 2 ]”
Claim · model-written summary
Elevated CO2 reduced S. hermonthica biomass per host.
- Taxon
- Sorghum bicolorSorghum bicolort0
- Treatment
- elevatede0
- Interactor
- S. hermonthicaStriga hermonthicae0parasite
- Outcome
- biomass of S. hermonthicae0
- Direction
- lowere0
- Comparator
- ambient [CO 2 ]e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sorghum bicolor”
e0“biomass of S. hermonthica and S. asiatica per host was lower under elevated than ambient [CO 2 ]”
Claim · model-written summary
Elevated CO2 reduced S. asiatica biomass per host.
- Taxon
- Sorghum bicolorSorghum bicolort0
- Treatment
- elevatede0
- Interactor
- S. asiaticaStriga asiaticae0parasite
- Outcome
- biomass of S. hermonthica and S. asiatica per hoste0
- Direction
- lowere0
- Comparator
- ambient [CO 2 ]e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sorghum bicolor”
e0“biomass of S. hermonthica and S. asiatica per host was lower under elevated than ambient [CO 2 ]”
Claim · model-written summary
Parasite photosynthesis was higher at elevated CO2.
- Taxon
- Sorghum bicolorSorghum bicolort0
- Treatment
- elevated [CO 2 ]e0
- Outcome
- rates of photosynthesise0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sorghum bicolor”
e0“rates of photosynthesis were higher at elevated [CO 2 ]”
Claim · model-written summary
Parasite stomatal conductance was unresponsive to CO2.
- Taxon
- Sorghum bicolorSorghum bicolort0
- Outcome
- parasite stomatal conductancee0
- Direction
- not responsivee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sorghum bicolor”
e0“parasite stomatal conductance was not responsive to [CO 2 ]”
Claim · model-written summary
Parasites emerged and flowered earlier at ambient than elevated CO2.
- Taxon
- Sorghum bicolorSorghum bicolort0
- Treatment
- ambiente0
- Outcome
- emerged above‐ground and flowerede0
- Direction
- earliere0
- Comparator
- elevated [CO 2 ]e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sorghum bicolor”
e0“Parasites emerged above‐ground and flowered earlier under ambient compared with elevated [CO 2 ]”
The same questions in other papers
infection · growth · Sorghum bicolor (sorghum)Positive and negative results
2 papers in the same direction as this paper · 3 in the opposite direction
- positive
- positive
- positive
2 papers more in this group
See all 6 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.