Abstract
Abstract Higher transpiration efficiency ( TE ) has been proposed as a mechanism to increase crop yields in dry environments where water availability usually limits yield. The application of a coupled radiation and TE simulation model shows wheat yield advantage of a high‐ TE cultivar (cv. Drysdale) over its almost identical low‐ TE parent line (Hartog), from about −7 to 558 kg/ha (mean 187 kg/ha) over the rainfed cropping region in Australia (221–1,351 mm annual rainfall), under the present‐day climate. The smallest absolute yield response occurred in the more extreme drier and wetter areas of the wheat belt. However, under elevated CO 2 conditions, the response of Drysdale was much greater overall, ranging from 51 to 886 kg/ha (mean 284 kg/ha) with the greatest response in the higher rainfall areas. Changes in simulated TE under elevated CO 2 conditions are seen across Australia with notable increased areas of higher TE under a drier climate in Western Australia, Queensland and parts of New South Wales and Victoria. This improved efficiency is subtly deceptive, with highest yields not necessarily directly correlated with highest TE . Nevertheless, the advantage of Drysdale over Hartog is clear with the benefit of the trait advantage attributed to TE ranging from 102% to 118% (mean 109%). The potential annual cost‐benefits of this increased genetic TE trait across the wheat growing areas of Australia (5 year average of area planted to wheat) totaled AUD 631 MIL (5‐year average wheat price of AUD /260 t) with an average of 187 kg/ha under the present climate. The benefit to an individual farmer will depend on location but elevated CO 2 raises this nation‐wide benefit to AUD 796 MIL in a 2°C warmer climate, slightly lower ( AUD 715 MIL ) if rainfall is also reduced by 20%.
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Claims 8
Claim · model-written summary
The high-TE wheat cultivar Drysdale yielded on average 187 kg/ha more than its low-TE parent Hartog in the rainfed region under present climate.
- Taxon
- wheat
Triticum aestivumt0 - Treatment
- high‐ TE cultivar (cv. Drysdale)e0
- Outcome
- wheat yielde0
- Direction
- higherinferrede0
- Value
- 187 kg/hae0
- Comparator
- low‐ TE parent line (Hartog)e0
- Setting
- rainfed cropping region in Australiae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“transpiration efficiency in wheat under elevated CO2”
e0“wheat yield advantage of a high‐ TE cultivar (cv. Drysdale) over its almost identical low‐ TE parent line (Hartog), from about −7 to 558 kg/ha (mean 187 kg/ha) over the rainfed cropping region in Australia”
Claim · model-written summary
Under elevated CO2 the yield response of Drysdale was greater, averaging 284 kg/ha.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- elevated CO 2 conditionse1
- Outcome
- response of Drysdalee1
- Direction
- greatere1
- Value
- 284 kg/hae1
- Qualifier
- ranging from 51 to 886 kg/hae1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“transpiration efficiency in wheat under elevated CO2”
e1“under elevated CO 2 conditions, the response of Drysdale was much greater overall, ranging from 51 to 886 kg/ha (mean 284 kg/ha)”
Claim · model-written summary
Under elevated CO2 the areas of higher TE increased under a drier climate in Western Australia, Queensland and parts of New South Wales and Victoria.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- elevated CO 2 conditionse2
- Outcome
- areas of higher TEe2
- Direction
- increasede2
- Setting
- Western Australia, Queensland and parts of New South Wales and Victoriae2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“transpiration efficiency in wheat under elevated CO2”
e2“Changes in simulated TE under elevated CO 2 conditions are seen across Australia with notable increased areas of higher TE under a drier climate in Western Australia, Queensland and parts of New South Wales and Victoria”
Claim · model-written summary
The highest yields were not necessarily directly correlated with the highest TE.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- highest yieldse3
- Qualifier
- not necessarily directly correlated with highest TEe3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“transpiration efficiency in wheat under elevated CO2”
e3“highest yields not necessarily directly correlated with highest TE”
Claim · model-written summary
The benefit of the TE trait for Drysdale over Hartog ranged from 102% to 118%.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- trait advantage attributed to TEe4
- Outcome
- benefit of the trait advantage attributed to TEe4
- Direction
- higherinferrede4
- Value
- 102% to 118%e4
- Comparator
- Hartoge4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“transpiration efficiency in wheat under elevated CO2”
e4“the advantage of Drysdale over Hartog is clear with the benefit of the trait advantage attributed to TE ranging from 102% to 118% (mean 109%)”
Claim · model-written summary
The potential annual cost-benefit of the higher-TE trait across Australian wheat areas totals AUD 631 MIL.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- potential annual cost‐benefits of this increased genetic TE traite5
- Value
- AUD 631 MILe5
- Setting
- wheat growing areas of Australiae5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“transpiration efficiency in wheat under elevated CO2”
e5“The potential annual cost‐benefits of this increased genetic TE trait across the wheat growing areas of Australia (5 year average of area planted to wheat) totaled AUD 631 MIL”
Claim · model-written summary
Elevated CO2 raises the nation-wide benefit to AUD 796 MIL in a 2°C warmer climate.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- elevated CO 2e6
- Outcome
- nation‐wide benefite6
- Direction
- raisese6
- Value
- AUD 796 MILe6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“transpiration efficiency in wheat under elevated CO2”
e6“elevated CO 2 raises this nation‐wide benefit to AUD 796 MIL in a 2°C warmer climate, slightly lower ( AUD 715 MIL ) if rainfall is also reduced by 20%”
Claim · model-written summary
If rainfall is also reduced by 20%, the nation-wide benefit is slightly lower at AUD 715 MIL.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- rainfall is also reduced by 20%e6
- Outcome
- nation‐wide benefite6
- Direction
- lowere6
- Value
- AUD 715 MILe6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“transpiration efficiency in wheat under elevated CO2”
e6“elevated CO 2 raises this nation‐wide benefit to AUD 796 MIL in a 2°C warmer climate, slightly lower ( AUD 715 MIL ) if rainfall is also reduced by 20%”
The same questions in other papers
co2 · physiology: gas exchange · Triticum aestivum (wheat)Positive and negative results
13 papers in the same direction as this paper · 14 in the opposite direction
- no effect
- no effect
- negative
24 papers more in this group
See all 28 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.