Exploring the Impacts of Elevated CO_(2)on Food Security:Nutrient Assimilation,Plant Growth,and Crop Quality  

作　　者：Felix D.Dakora Huihui Li Jun Zhao 

机构地区：[1]National Nanfan Research Institute of Chinese Academy of Agricultural Sciences(CAAS),Sanya 572024,China [2]Chemistry Department,Tshwane University of Technology,Pretoria 0001,South Africa [3]State Key Laboratory of Crop Gene Resources and Breeding,Institute of Crop Sciences,CAAS,Beijing 100081,China [4]Biotechnology Research Institute,CAAS,Beijing 100081,China

出　　处：《Engineering》2025年第1期234-244,共11页工程(英文)

基　　金：supported by the Nanfan special project,CAAS(YBXM2408);the Innovation Program of Chinese Academy of Agricultural Sciences(CAAS-CSIAF-202303)to Huihui Li;a grant from Sanya Municipal Program for Science and Technology Innovation(2022KJCX87);the Nanfan special project,CAAS(YBXM2319),to Jun Zhao。

摘　　要：Despite its negative impacts on plant functioning,climate change benefits plants at the cellular level.For example,the stimulation of C3 photosynthesis by elevated CO_(2)can increase N2 fixation by 73%and grain yield by 10%–11%.The global elevated atmospheric CO_(2)concentration has already decreased the nitrogen content in C3 crop species and C3 woody vegetation by 14%and 21%,respectively,regardless of added nitrogen fertilizer.^(15)N-feeding experiments have shown that,after 19 h under elevated CO_(2),the^(15)N concentration in the stems,roots plus rhizomes,and whole plants of Scirpus olneyi(S.olneyi)decreased by 51%,63%,and 74%,respectively.Moreover,S.olneyi showed reduced NH_(4)^(+)assimilation under elevated CO_(2),which decreased the amino acid contents in the stems by 25.6%for glycine and 65.0%for serine,and that in the roots plus rhizomes by 2%for gamma-aminobutyric acid(GABA)and 80%for glutamate.Wheat grain protein has also been found to decrease by 7.4%under elevated CO_(2)due to reductions in threonine,valine,iso-leucine,leucine,and phenylalanine.The mineral nutrient contents in grains of rice and maize were similarly found to decrease under high CO_(2)by 1.0%and 7.1%for phosphorus,7.8%and 2.1%for sulfur,5.2%and 5.8%for iron,3.3%and 5.2%for zinc,10.6%and 9.9%for copper,and 7.5%and 4.2%for manganese,respectively.In general,mineral concentrations in C3 plants are predicted to decrease by 8%under elevated CO_(2),while total non-structural carbohydrates(mainly starch and sugars)are expected to increase.These decreases in grain protein,amino acids,and mineral nutrients could double the incidence of global protein-calorie malnutrition and micronutrient deficiency—especially in Africa,where agricultural soils are inherently low in nutrient elements.Additionally,the increase in total non-structural carbohydrates(mainly starch and sugars)in cereal crops could elevate diabetes incidence due to heavy reliance on starchy diets.The negative effects of elevated CO_(2)on rice,maize,and wheat—the world's three m

关 键 词：PHOTOSYNTHESIS N_(2)fixation Reduced plant nitrogen Amino acids and nutrients 

分 类 号：S162[农业科学—农业气象学]