Intraspecific variation of response to elevated CO₂ (eCO₂) is a powerful option to improve crop productivity under the future climate. We evaluated genotypic variation in the biomass response to eCO₂, at 200 μmol/mol above ambient CO₂ (aCO₂) 33 to 38 days after transplanting in 7 African rice (Oryza glaberrima Steud.) genotypes and 10 Asian rice (Oryza sativa L.) genotypes during a 3‐year experiment. A comparison at vegetative growth at aCO₂, African rice genotypes showed 60% to 76% greater biomass than Asian rice genotypes. eCO₂ significantly increased biomass of both species, and the magnitude of the increase was similar between the African (by 12% to 19% of averaged over three years) and Asian accessions (7 to 24%). The genotypic variation in the biomass response to eCO₂ could be explained by the leaf area response rather than by the efficiency of biomass production per unit leaf area or leaf photosynthesis across the species. Dry matter partitioning to leaves determines biomass responsiveness to elevated atmospheric CO₂ in comparison between African and Asian rice genotypes.

中文翻译：

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干物质分配至叶片可区分暴露于高CO2的非洲和亚洲水稻基因型

种内对升高的CO ₂（eCO ₂）响应的变化是在未来气候下提高作物生产率的有力选择。我们在生物质响应于生态评估基因型变异₂，在200微摩尔/摩尔高于环境CO ₂（ACO ₂）在7非洲水稻移栽后33至38天（光稃稻大戟）基因型和10亚稻（稻大号。）3年实验中的基因型。在aCO ₂进行营养生长的比较中，非洲水稻基因型的生物量比亚洲水稻基因型高60％至76％。生态₂两种物种的生物量均显着增加，非洲（3年平均值的平均值为12％至19％）和亚洲种质（7％至24％）的增加幅度相似。生物量对eCO _2的反应的基因型变化可以通过叶面积反应来解释，而不是通过每单位叶面积的生物量生产效率或整个物种的光合作用来解释。与非洲和亚洲水稻基因型相比，干物质分配至叶片决定了生物量对大气中CO ₂升高的响应。