Abstract
Abstract The atmospheric [ CO 2 ] in which crops grow today is greater than at any point in their domestication history and represents an opportunity for positive effects on seed yield that can counteract the negative effects of greater heat and drought this century. In order to maximize yields under future atmospheric [ CO 2 ], we need to identify and study crop cultivars that respond most favorably to elevated [ CO 2 ] and understand the mechanisms contributing to their responsiveness. Soybean ( Glycine max Merr.) is a widely grown oilseed crop and shows genetic variation in response to elevated [ CO 2 ]. However, few studies have studied the physiological basis for this variation. Here, we examined canopy light interception, photosynthesis, respiration and radiation use efficiency along with yield and yield parameters in two cultivars of soybean (Loda and HS 93‐4118) previously reported to have similar seed yield at ambient [ CO 2 ], but contrasting responses to elevated [ CO 2 ]. Seed yield increased by 26% at elevated [ CO 2 ] (600 μmol/mol) in the responsive cultivar Loda, but only by 11% in HS 93‐4118. Canopy light interception and leaf area index were greater in HS 93‐4118 in ambient [ CO 2 ], but increased more in response to elevated [ CO 2 ] in Loda. Radiation use efficiency and harvest index were also greater in Loda than HS 93‐4118 at both ambient and elevated [ CO 2 ]. Daily C assimilation was greater at elevated [ CO 2 ] in both cultivars, while stomatal conductance was lower. Electron transport capacity was also greater in Loda than HS 93‐4118, but there was no difference in the response of photosynthetic traits to elevated [ CO 2 ] in the two cultivars. Overall, this greater understanding of leaf‐ and canopy‐level photosynthetic traits provides a strong conceptual basis for modeling genotypic variation in response to elevated [ CO 2 ].
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 9
Claim · model-written summary
Loda seed yield increased 26% under elevated carbon dioxide.
- Taxon
- soybean
Glycine maxt0 - Material
- Lodae0
- Treatment
- elevated [ CO 2 ] (600 μmol/mol)e0
- Outcome
- Seed yielde0
- Direction
- increasede0
- Value
- 26%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seed yield increased by 26% at elevated [ CO 2 ] (600 μmol/mol) in the responsive cultivar Loda”
t0“soybean”
Claim · model-written summary
HS 93‐4118 seed yield increased 11% under elevated carbon dioxide.
- Taxon
- soybeanGlycine maxt0
- Material
- HS 93‐4118e0
- Treatment
- elevated [ CO 2 ]e0
- Outcome
- Seed yielde0
- Direction
- increasede0
- Value
- 11%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seed yield increased by 26% at elevated [ CO 2 ] (600 μmol/mol) in the responsive cultivar Loda, but only by 11% in HS 93‐4118”
t0“soybean”
Claim · model-written summary
HS 93‐4118 had greater canopy light interception and leaf area index under ambient carbon dioxide.
- Taxon
- soybeanGlycine maxt0
- Material
- HS 93‐4118e0
- Treatment
- ambient [ CO 2 ]e0
- Outcome
- Canopy light interception and leaf area indexe0
- Direction
- greatere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Canopy light interception and leaf area index were greater in HS 93‐4118 in ambient [ CO 2 ]”
t0“soybean”
Claim · model-written summary
Canopy light interception and leaf area index increased more in Loda under elevated carbon dioxide.
- Taxon
- soybeanGlycine maxt0
- Material
- Lodae0
- Treatment
- elevated [ CO 2 ]e0
- Outcome
- Canopy light interception and leaf area indexe0
- Direction
- increased moree0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Canopy light interception and leaf area index were greater in HS 93‐4118 in ambient [ CO 2 ], but increased more in response to elevated [ CO 2 ] in Loda”
t0“soybean”
Claim · model-written summary
Loda had greater radiation use efficiency and harvest index than HS 93‐4118 at both carbon dioxide levels.
- Taxon
- soybeanGlycine maxt0
- Material
- Lodae0
- Outcome
- Radiation use efficiency and harvest indexe0
- Direction
- greatere0
- Qualifier
- at both ambient and elevated [ CO 2 ]e0
- Comparator
- HS 93‐4118e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Radiation use efficiency and harvest index were also greater in Loda than HS 93‐4118 at both ambient and elevated [ CO 2 ]”
t0“soybean”
Claim · model-written summary
Daily carbon assimilation was greater under elevated carbon dioxide in both cultivars.
- Taxon
- soybeanGlycine maxt0
- Treatment
- elevated [ CO 2 ]e0
- Outcome
- Daily C assimilatione0
- Direction
- greatere0
- Qualifier
- both cultivarse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Daily C assimilation was greater at elevated [ CO 2 ] in both cultivars”
t0“soybean”
Claim · model-written summary
Stomatal conductance was lower under elevated carbon dioxide in both cultivars.
- Taxon
- soybeanGlycine maxt0
- Treatment
- elevated [ CO 2 ]e0
- Outcome
- stomatal conductancee0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Daily C assimilation was greater at elevated [ CO 2 ] in both cultivars, while stomatal conductance was lower”
t0“soybean”
Claim · model-written summary
Loda had greater electron transport capacity than HS 93‐4118.
- Taxon
- soybeanGlycine maxt0
- Material
- Lodae0
- Outcome
- Electron transport capacitye0
- Direction
- greatere0
- Comparator
- HS 93‐4118e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Electron transport capacity was also greater in Loda than HS 93‐4118”
t0“soybean”
Claim · model-written summary
The cultivars did not differ in photosynthetic trait response to elevated carbon dioxide.
- Taxon
- soybeanGlycine maxt0
- Outcome
- response of photosynthetic traits to elevated [ CO 2 ]e0
- Direction
- no differencee0
- Qualifier
- two cultivarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was no difference in the response of photosynthetic traits to elevated [ CO 2 ] in the two cultivars”
t0“soybean”
The same questions in other papers
co2 · yield · Glycine max (soybean)Positive and negative results
85 papers in the same direction as this paper · 10 in the opposite direction
- no effect
- positive
- positive
92 papers more in this group
See all 96 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.