摘要
为深入理解气候变化背景下玉米对大气CO_(2)浓度升高和土壤镉污染的生理生态响应,本研究以“郑单958”玉米品种为试材,利用可精准控制CO_(2)浓度的环境生长室,采用裂区实验方法探讨了不同CO_(2)浓度和CdCl_(2)胁迫对玉米气体交换参数、叶绿素含量、植株生物量、MDA含量及相关抗氧化酶活性的交互影响。结果表明:大气CO_(2)浓度升高导致轻度和重度CdCl_(2)胁迫下玉米的净光合速率(P_(n))分别提高24%(P<0.001)和6%(P<0.05),但却降低了叶片的蒸腾速率(P<0.001)和气孔导度(P<0.001),从而导致水分利用效率均显著提高(P<0.001);轻度CdCl_(2)胁迫显著提高了环境CO_(2)浓度下的叶片生物量(P<0.001),但CO_(2)浓度升高却降低根系生物量(P<0.05)和茎秆生物量(P<0.001);轻度与中度CdCl_(2)胁迫导致不同CO_(2)浓度下叶片MDA含量增多,同时POD活性上升,但CO_(2)浓度升高却减少了MDA含量并导致POD活性下降;CO_(2)浓度和CdCl_(2)胁迫对叶片的P_(n)产生了显著的交互影响(P=0.002),大气CO_(2)浓度升高可以提高轻度与中度CdCl_(2)胁迫下玉米净光合速率和水分利用效率,且同时导致MDA含量的降低,从而增强植株抵抗CdCl_(2)胁迫的能力。
To better understand the physiological and ecological responses of maize to elevated atmospheric CO_(2) concentration and soil cadmium pollution under future climate change,we investigated the interactive effects of different CO_(2) concentrations and CdCl_(2) stresses on leaf gas exchange,chlorophyll content,plant biomass as well as the MDA content and related antioxidant enzyme activities of the maize cultivar Zhengdan 958 in a split-plot experiment with environmental growth chambers.Elevated atmospheric CO_(2) concentration increased net photosynthetic rate(P_(n))by 24%(P<0.001)and 6%(P<0.05)under mild and severe CdCl_(2) stress,respectively.Elevated atmospheric CO_(2) concentration decreased the transpiration rate and stomatal conductance of maize leaves(P<0.001),and thus increased the instantaneous water use efficiency(P<0.001).Mild CdCl_(2) stress significantly increased leaf biomass under ambient CO_(2) concentration(P<0.001),but elevated CO_(2) concentration decreased root biomass(P<0.05)and stem biomass of maize(P<0.001).Mild and moderate CdCl_(2) stress increased MDA content and POD activity in maize leaves under different CO_(2) concentrations,but elevated CO_(2) concentration reduced MDA content and POD activity.There were significantly interactive effects of CO_(2) concentration and CdCl_(2) stress on the P_(n) of maize plants(P=0.002).Our results suggested that elevated atmospheric CO_(2) concentration could increase net photosynthetic rate and instantaneous water use efficiency of maize under mild and moderate CdCl_(2) stress,but reduce the MDA content,thus improving the resistance of maize plants to CdCl_(2) stress.
作者
张佳睿
莫晓燕
宋炜
李菲
马超
郝立华
郑云普
刘亮
ZHANG Jiarui;MO Xiaoyan;SONG Wei;LI Fei;MA Chao;HAO Lihua;ZHENG Yunpu;LIU Liang(School of Water Conservancy and Hydropower,Hebei University of Engineering,Handan,056038,Hebei,China;Environmental Geological Survey Institute of Hebei Coalfield Geological Bureau,Shijiazhuang,050091,China)
出处
《生态学杂志》
北大核心
2025年第11期3620-3628,共9页
Chinese Journal of Ecology
基金
河北省自然科学基金项目(E2023402086和E2024402128)资助。
