中国生态农业学报2017，Vol.25Issue(1)：55-60,6.DOI:10.13930/j.cnki.cjea.160687
大气CO2浓度升高对谷子生长发育及玉米螟发生的影响
Effect of elevated [CO2] on growth and attack of Asian corn borers (Ostrinia furnacalis) in foxtail millet (Setaria italica)
摘要
Abstract
Since industrial revolution, global atmospheric carbon dioxide (CO2) concentration ([CO2]) has risen from 280mmol·mol–1 to the current level of about 392mmol·mol–1. Foxtail millet (Setaria italica) is one of the most important C4 crops in the semiarid regions of North China, yet there is lack of sufficient information on how the crop responds to climate change in China. Here, we studied the effects of elevated atmospheric [CO2] on foxtail millet in order to understand the changes in foxtail millet production under future CO2 concentrations along with the response of C4 crops to climate change. An open top chamber (OTC) system was used to test the effect of elevated [CO2] on foxtail millet. One OTC was used as the control chamber, which maintained the ambient [CO2]. In another OTC, elevated [CO2] (ambient [CO2] + 200 mmol×mol–1) was constantly maintained from crop emergence to harvest. Foxtail millet was sown in 40 cm × 60 cm pots (28 cm depth). Ten plants were grown in each pot and 10 pots were put in every OTC. Leaf photosynthesis was measured using a portable gas exchange system. Chlorophyll fluorescence parameter was assessed using a miniaturized pulse-amplitude modulated fluorescence analyzer with a leaf clip holder. The changes in morphological parameters, biomass, yield and damage of Asian corn borer (Ostrinia furnacalis) in response to elevated [CO2] were also determined. The results showed that elevated [CO2] increased the net photosynthesis rate (Pn), stomatal conductance (gs), transpiration rate (Tr) and water use efficiency (WUE) of foxtail millet by 38.73%, 27.53%, 6.93% and 40.56%, respectively. The maximal photochemical quantum yield (Fv/Fm) and non-photochemical quenching coefficient (NPQ) of foxtail millet leaf photosystem Ⅱ significantly decreased under elevated [CO2]. Photosystem Ⅱ quantum yield (ΦPSII) and apparent electron transfer rate (ETR) increased, but the change in photochemical quenching destruction coefficient (qP) was not significant. Elevated [CO2] increased foxtail millet plant height, stem diameter and spikelet number by 3.41%, 13.28% and 13.11%, respectively. Elevated [CO2] did not significantly affect leaf mass, stem mass, thousand-seed weight or the number of grain per plant at harvest, but the mass of panicle and aboveground per m2 significantly decreased by 12.8% and 7.44%, respectively. Furthermore, Asian corn borer damage aggravated at filling-stage and harvest under elevated [CO2]. However, yield did not significantly change under elevated [CO2]. In conclusion, elevated atmospheric [CO2] promoted the growth and development of foxtail millet, but increased the risk of insect damage.关键词
CO2浓度升高/谷子/光合作用/产量/玉米螟Key words
Elevated CO2 concentration/Foxtail millet/Photosynthesis/Yield/Asian corn borer分类
农业科技引用本文复制引用
刘紫娟,李萍,宗毓铮,董琦,郝兴宇..大气CO2浓度升高对谷子生长发育及玉米螟发生的影响[J].中国生态农业学报,2017,25(1):55-60,6.基金项目
国家重点基础研究发展计划(973计划)课题(2012CB955904)、国家科技支撑计划项目(2013BAD11B03-8)、山西省科技攻关计划项目(20150311006-2)、国家自然科学基金项目(31601212,31501276)和山西农业大学博士引进人才项目(2013YT05)资助 （973计划）
