生态学报2017，Vol.37Issue(6)：2033-2044,12.DOI:10.5846/stxb201509261974
高CO2浓度对杂交水稻光合作用日变化的影响——FACE研究
Effect of increasing atmospheric CO2 concentration on photosynthetic diurnal variation characteristics of hybrid rice: a FACE study
摘要
Abstract
The rising of atmospheric carbon dioxide (CO2) concentration has been blamed for global warming,but it promotes the leaf photosynthesis of crops because CO2 is the main substrate for photosynthesis.In order to understand the effect of elevated CO2 concentration on diurnal courses of CO2 uptake of hybrid riee,a paddy field experiment utilizing free air CO2 enrichment (FACE) technology was undertaken to determine diurnal courses of leaf photosynthesis at heading and middle grain filling stages,and its association with the final productivity of rice at maturity.Two hybrid rice variety Yongyou 2640 (YY 2640) and YLiangyou No.2 (YLY 2) were grown in the ambient CO2 and the elevated CO2 concentration (200 μmol/mol above ambient) from plant transplanting until grain maturity.Elevated CO2 concentration significantly increased net photosynthetic CO2 assimilation of flag leaves of two hybrids by 52％ on average at heading,but the enhancement was reduced to half at the middle grain filling stage.This photosynthesis acclimation was more pronounced in YLY 2.Elevated CO2 concentration significantly decreased stomatal conductance of two hybrids at both heading and grain filling stages,resulting in lower transpiration and higher water use efficiency.Greater CO2 responses of leaf transpiration and stomatal conductance were observed in the morning for YLY 2,but YY 2640 showed higher CO2 effects in the afternoon.Growth at elevated CO2 concentration significantly increased intercellular CO2 concentration,but had no clear effects on the ratio of intercellular to air CO2 concentration and stomata limitation value,and the same trend was observed for the two varieties.The CO2 effects on the above-ground biomass and its components were greater in YY 2640 than YLY 2,and it was reflected in the significant CO2 by variety interactions.The results indicated that compared with YY 2640,the lower CO2 gain on final productivity of YLY 2 might result from photosynthesis acclimation at the late growth stage,and this down-regulation in leaf photosynthesis was not caused by stomatal limitation.关键词
杂交稻/FACE(Free Air CO2Enrichment)/二氧化碳/光合作用/日变化/适应Key words
hybrid rice/FACE (Free Air CO2 Enrichment)/carbon dioxide (CO2)/photosynthetic/diurnal variation/adaptation引用本文复制引用
景立权,赵新勇,周宁,钱晓晴,王云霞,朱建国,王余龙,杨连新..高CO2浓度对杂交水稻光合作用日变化的影响——FACE研究[J].生态学报,2017,37(6):2033-2044,12.基金项目
国家自然科学基金面上项目(31571597,31371563,31171460) （31571597,31371563,31171460）
国家自然科学基金国际(地区)合作与交流项目(31261140364) （地区）
中国博士后科学基金资助项目(2015M581870) （2015M581870）
江苏省博士后科研资助计划(1501077C) （1501077C）
江苏高校优势学科建设工程项目资助 （）
