Effect of MCPA-Na Stress on Physiological Characteristics of Zizania caduciflora（Turcz.）Hand．-Mazz.
HUANG Kai-feng1，2，FANG Yan3，JIANG Jie-zeng1*
1Aquatic Vegetable Research Laboratory，Yangzhou University，Yangzhou 225009，Jiangsu，China；2Institute of Plant Genetics and Breeding，School of Life Sciences，Guizhou Normal University，Guiyang 550001，Guizhou，China；3Hanjiang District of Shatou Township Government，Yangzhou 225009，Jiangsu，China
Abstract：The Changes of physiological and biochemical indexes in leaves and roots of Zizania caduciflora（Turcz.）Hand．-Mazz．were studied every 5 days on single-harvested cultivar‘Jiangshujiao’and double-harvested cultivar‘Fenghongzao’，which were treated with different concentration of MCPA-Na．The effect of MCPA-Na on physiological characteristics of Zizania caduciflora（Turcz.）Hand．-Mazz．as discussed．The results indicated that the root activity and chlorophyll content of the 2 varieties were increased when treated with low concentration of MCPA-Na．While they were decreased when increasing the concentration of MCPA-Na．However，the membrane permeability，MDA and praline contents，POD and PPO activities of Zizania caduciflora（Turcz.）Hand．-Mazz．were increased when increasing MCPA-Na concentration．Injury of MCPA-Na stress to the 2 Zizania caduciflora（Turcz.）Hand．-Mazz．varieties were increased along with the increasing of treating times．There were differences between cultivars.
