The results from histochemical detection show that pretreatment with the NADPH oxidase inhibitor DPI and the ROS scavengers CAT and SOD almost completely arrested the increase of water stress-induced H_2O_2 production in the leaves of wild-type maize.

• 这些结果表明质外体是水分胁迫诱导玉米叶片H_2O_2积累的主要来源，NADPH氧化酶参与了水分胁迫诱导的质外体H_2O_2积累，但叶片细胞内H_2O_2的积累并不依赖质外体H_2O_2积累。