臭氧浓度升高和增温对小麦籽粒品质的复合影响OA

Human activities have led to a concurrent increase in surface ozone(O3)concentration and temperature,both of which significantly impact crop growth.To thoroughly investigate the combined effects of elevated O3 and temperature on wheat grain quality,this study utilized an open-air O3 and temperature elevation platform(O3-T-FACE).The experiment included two O3 levels:ambient concentration(A)and 1.5 times ambient concentration(E),and two temperature levels:ambient temperature(CK)and canopy infrared warming by 2 ℃(W).This resulted in four treatments:elevated O3,warming,elevated O3+warming,and control.Two wheat cultivars with differing O3 sensitivity-Lianmai 7(O3-sensitive)and Nongmai 88(O3-tolerant)—were grown under each treatment to clarify their responses to the combined stressors.Post-harvest analyses determined grain protein,starch and its components,and mineral element contents.The results showed that elevated O3 significantly increased grain protein and most mineral element contents.Warming significantly decreased grain Ca content but increased Mg,P,and Zn contents.The responses of starch and its components to O3 and temperature varied significantly between cultivars.Under elevated O3,Lianmai 7 exhibited significant decreases of 6.5％in total starch and 11.4％in amylopectin contents.Under warming,Nongmai 88 showed significant reductions of 7.0％in total starch and 8.8％in amylose contents,while its protein content increased significantly by 5.7％.The study demonstrates that elevated O3 and warming had no interactive effects on wheat grain quality.Lianmai 7 was sensitive to O3 but tolerant to warming,whereas Nongmai 88 was tolerant to O3 but sensitive to temperature increases.