Abstract
Soybean, peanut and rice were grown at 350 and 700 (high) ppm CO2, and under varying day/night temperature (T) regimes ranging from 28/18 to 48/38C for soybean and peanut, or soil water deficit for rice, (a) to determine the interactive impacts of high CO2-high T, or high CO2-drought, on midday leaf CO2 exchange rate (CER) and Rubisco activity, and (b) to test whether high CO2, high T or drought stress would induce changes in the Rubisco Km(CO2). CER of soybean, peanut and rice was increased by high CO2, but decreased by high T and drought. For soybean, the high-CO2 plants compensated much better for the adverse effects of high T on CER. For the drought-imposed rice plants, high CO2 delayed by one day the substantial reduction in CER. High CO2, high T and severe drought also reduced Rubisco initial and total activities and activation state. Soybean and peanut Rubisco initial Km(CO2) was not altered by high CO2 or high T, as neither severe drought changed the rice Rubisco initial Km(CO2), but there were moderate increases in Rubisco total Km(CO2) for soybean and peanut at high CO2 and high T. The results suggest that multiple generations of growth at high CO2 might be required for Rubisco of C3 plants to evolve towards a more effective type enzyme.
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Claims 16
Claim · model-written summary
High CO2 increased soybean leaf CER.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CER of soybean, peanut and rice was increased by high CO2”
e1“350 and 700 (high) ppm CO2”
Claim · model-written summary
High CO2 increased peanut leaf CER.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CER of soybean, peanut and rice was increased by high CO2”
e1“350 and 700 (high) ppm CO2”
Claim · model-written summary
High CO2 increased rice leaf CER.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CER of soybean, peanut and rice was increased by high CO2”
e1“350 and 700 (high) ppm CO2”
Claim · model-written summary
High temperature decreased soybean leaf CER.
- Taxon
- soybean
Glycine maxe0 - Treatment
- high Te0
- Outcome
- CERe0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CER of soybean, peanut and rice was increased by high CO2, but decreased by high T and drought”
e1“high CO2-high T”
Claim · model-written summary
High temperature decreased peanut leaf CER.
- Taxon
- peanut
Arachis hypogaeae0 - Treatment
- high Te0
- Outcome
- CERe0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CER of soybean, peanut and rice was increased by high CO2, but decreased by high T and drought”
Claim · model-written summary
Drought decreased rice leaf CER.
- Taxon
- rice
Oryza sativae0 - Treatment
- droughte0
- Outcome
- CERe0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CER of soybean, peanut and rice was increased by high CO2, but decreased by high T and drought”
Claim · model-written summary
Elevated CO2 better compensated for the adverse high temperature effect on soybean CER.
- Taxon
- soybeanGlycine maxe0
- Treatment
- high-CO2e0
- Outcome
- adverse effects of high T on CERe0
- Direction
- much bettere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For soybean, the high-CO2 plants compensated much better for the adverse effects of high T on CER”
Claim · model-written summary
High CO2 delayed substantial CER reduction in drought stressed rice by one day.
- Taxon
- riceOryza sativae0
- Treatment
- high CO2e0
- Outcome
- substantial reduction in CERe0
- Direction
- delayede0
- Value
- one daye0
- Qualifier
- drought-imposede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For the drought-imposed rice plants, high CO2 delayed by one day the substantial reduction in CER”
Claim · model-written summary
High CO2 reduced Rubisco initial and total activities and activation state.
- Taxon
- Soybean, peanut and riceArachis hypogaeaGlycine maxOryza sativae1
- Treatment
- High CO2e0
- Gene
- Rubiscoe0
- Outcome
- Rubisco initial and total activities and activation statee0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High CO2, high T and severe drought also reduced Rubisco initial and total activities and activation state”
e1“Soybean, peanut and rice”
Claim · model-written summary
High temperature reduced Rubisco initial and total activities and activation state.
- Taxon
- Soybean, peanut and riceArachis hypogaeaGlycine maxOryza sativae1
- Treatment
- high Te0
- Gene
- Rubiscoe0
- Outcome
- Rubisco initial and total activities and activation statee0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High CO2, high T and severe drought also reduced Rubisco initial and total activities and activation state”
e1“Soybean, peanut and rice”
Claim · model-written summary
Severe drought reduced Rubisco initial and total activities and activation state.
- Taxon
- Soybean, peanut and riceArachis hypogaeaGlycine maxOryza sativae1
- Treatment
- severe droughte0
- Gene
- Rubiscoe0
- Outcome
- Rubisco initial and total activities and activation statee0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High CO2, high T and severe drought also reduced Rubisco initial and total activities and activation state”
e1“Soybean, peanut and rice”
Claim · model-written summary
High CO2 did not alter soybean and peanut Rubisco initial Km(CO2).
- Taxon
- Soybean and peanutArachis hypogaeaGlycine maxe0
- Treatment
- high CO2e0
- Gene
- Rubiscoe0
- Outcome
- Rubisco initial Km(CO2)e0
- Direction
- not alterede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soybean and peanut Rubisco initial Km(CO2) was not altered by high CO2 or high T”
Claim · model-written summary
High temperature did not alter soybean and peanut Rubisco initial Km(CO2).
- Taxon
- Soybean and peanutArachis hypogaeaGlycine maxe0
- Treatment
- high Te0
- Gene
- Rubiscoe0
- Outcome
- Rubisco initial Km(CO2)e0
- Direction
- not alterede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soybean and peanut Rubisco initial Km(CO2) was not altered by high CO2 or high T”
Claim · model-written summary
Severe drought did not alter rice Rubisco initial Km(CO2).
- Taxon
- riceOryza sativae0
- Treatment
- severe droughte0
- Gene
- Rubiscoe0
- Outcome
- Rubisco initial Km(CO2)e0
- Direction
- neither severe drought changede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“neither severe drought changed the rice Rubisco initial Km(CO2)”
Claim · model-written summary
High CO2 moderately increased soybean and peanut Rubisco total Km(CO2).
- Taxon
- soybean and peanutArachis hypogaeaGlycine maxe0
- Treatment
- high CO2e0
- Gene
- Rubiscoe0
- Outcome
- Rubisco total Km(CO2)e0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“moderate increases in Rubisco total Km(CO2) for soybean and peanut at high CO2 and high T”
Claim · model-written summary
High temperature moderately increased soybean and peanut Rubisco total Km(CO2).
- Taxon
- soybean and peanutArachis hypogaeaGlycine maxe0
- Treatment
- high Te0
- Gene
- Rubiscoe0
- Outcome
- Rubisco total Km(CO2)e0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“moderate increases in Rubisco total Km(CO2) for soybean and peanut at high CO2 and high T”
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