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《Acta Horticulturae Sinica》 2007-02
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Influence of Cadmium on Metabolism and Its Residual Quantity in Gall of Zizania latifolia Cultured in Reed Sediment Substrate

JIANG Jie-zeng1,2,HUANG Kai-feng2,YANG Kai2,BIAN Xiao-dong2,HUANG Dong-lin2,CAO Bei-sheng2,and GUO Shi-rong1(1College of Horticulture,Nanjing Agricultural University,Nanjing 210095,China;2Aquatic Vegetable Research Institute,Yangzhou University,Yangzhou,Jiangsu 225009,China)  
Changes of some physiological and biochemical indexes in leaves and roots of the Zizania latifolia were studied with single-harvested cultivar Jiangshujiao and double-harvested cultivar Fenghongzao which cultured in reed sediment substrate with different Cd2+ concentrations.The Cd2+ residues in Zizania galls were also determined.The results showed that,after about 2 months of treatment,the soluble protein content and net photosynthetic rate of functional leaves arrived the maximum when the Cd2+ concentration was 25 mg·L-1,and then decreased with increasing Cd2+ concentration.The activities of POD,PPO increased with the increasing Cd2+ concentration until 200 mg·L-1.The Cd2+ residues in Zizania galls in all treatments were lower than the national maximum residue standards of non-polluted vegetables.The Cd2+ residues in Fenghongzao galls were higher than those in Jiangshujiao in all treatments.The Cd2+ accumulation in next summer-harvested galls was higher observably than those in first-autumn-harvested galls of Fenghongzao.It is considered that the Zizania latifolia has a high tolerance to Cd2+ stress while has a low Cd2+ bio-enrichment in the edible organ.A significant positive correlation was observed between the Cd2+ residual quantity in the galls and the time of Cd2+ treatment.
【Fund】: 国土资源部与江苏省政府合作项目([2003]019-01)
【CateGory Index】: S645.2
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