Abstract
Abstract Spring wheat [ Triticum aestivum (L). cv. Yecora Rojo] was grown from December 1992 to May 1993 under two atmospheric CO 2 concentrations, 550 μmol mol –1 for high‐CO 2 plots, and 370 μmol mol –1 for control plots, using a Free‐Air CO 2 Enrichment (FACE) apparatus. In addition to the two levels of atmospheric CO 2 , there were ample and limiting levels of water supply through a subsurface trip irrigation system in a strip, split‐plot design. In order to examine the temporal and spatial root distribution, root cores were extracted at six growth stages during the season at in‐row and inter‐row positions using a soil core device (86 mm ID, 1.0 m length). Such information would help determine whether and to what extent root morphology is changed by alteration of two important factors, atmospheric CO 2 and soil water, in this agricultural ecosystem. Wheat root growth increased under elevated CO 2 conditions during all observed developmental stages. A maximum of 37% increase in total root dry mass in the FACE vs. Control plots was observed during the period of stem elongation. Greater root growth rates were calculated due to CO 2 enhancement until anthesis. During the early vegetative growth, root dry mass of the inter‐row space was significantly higher for FACE than for Control treatments suggesting that elevated CO 2 promoted the production of first‐order lateral roots per main axis. Then, during the reproductive period of growth, more branching of lateral roots in the FACE treatment occurred due to water stress. Significant higher root dry mass was measured in the inter‐row space of the FACE plots where soil water supply was limiting. These sequential responses in root growth and morphology to elevated CO 2 and reduced soil water supports the hypothesis that plants grown in a high‐CO 2 environment may better compensate soil‐water‐stress conditions.
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Claims 7
Claim · model-written summary
Elevated CO2 increased wheat root growth at every observed developmental stage.
- Taxon
- Wheat
Triticum aestivume0 - Treatment
- elevated CO 2 conditionse0
- Outcome
- root growthe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Wheat root growth increased under elevated CO 2 conditions during all observed developmental stages.”
Claim · model-written summary
FACE increased total root dry mass by as much as 37% during stem elongation.
- Taxon
- wheatTriticum aestivumt0
- Organ / stage
- stem elongatione0
- Treatment
- FACEe0
- Outcome
- total root dry masse0
- Direction
- increasee0
- Value
- 37%e0
- Comparator
- Control plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A maximum of 37% increase in total root dry mass in the FACE vs. Control plots was observed during the period of stem elongation.”
t0“wheat root growth”
Claim · model-written summary
CO2 enhancement increased root growth rates until anthesis.
- Taxon
- wheatTriticum aestivumt0
- Organ / stage
- anthesise0
- Treatment
- CO 2 enhancemente0
- Outcome
- root growth ratese0
- Direction
- Greatere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Greater root growth rates were calculated due to CO 2 enhancement until anthesis.”
t0“wheat root growth”
Claim · model-written summary
FACE increased inter-row root dry mass in early vegetative growth.
- Taxon
- wheatTriticum aestivumt0
- Organ / stage
- early vegetative growthe0
- Treatment
- FACEe0
- Outcome
- root dry mass of the inter‐row spacee0
- Direction
- highere0
- Comparator
- Control treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“During the early vegetative growth, root dry mass of the inter‐row space was significantly higher for FACE than for Control treatments”
t0“wheat root growth”
Claim · model-written summary
FACE increased lateral-root branching during reproductive growth under water stress.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- FACE treatmente0
- Outcome
- branching of lateral rootse0
- Direction
- moree0
- Qualifier
- due to water stresse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“during the reproductive period of growth, more branching of lateral roots in the FACE treatment occurred due to water stress.”
t0“wheat root growth”
Claim · model-written summary
FACE increased inter-row root dry mass under limiting water supply.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- FACEe0
- Outcome
- root dry masse0
- Direction
- highere0
- Qualifier
- soil water supply was limitinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant higher root dry mass was measured in the inter‐row space of the FACE plots where soil water supply was limiting.”
t0“wheat root growth”
Claim · model-written summary
Authors infer high-CO2 plants may better compensate for soil water stress.
- Taxon
- plantsViridiplantaee0
- Treatment
- high‐CO 2 environmente0
- Outcome
- better compensate soil‐water‐stress conditionse0
- Qualifier
- maye0
Verbatim
e0“plants grown in a high‐CO 2 environment may better compensate soil‐water‐stress conditions.”
The same questions in other papers
co2 · growth · Triticum aestivum (wheat)Positive and negative results
123 papers in the same direction as this paper · 20 in the opposite direction · 1 reporting no difference from an alternative
- positive
- positive
- positive
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