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络合型含铁材料对砷胁迫下水稻生理生化特性及砷累积的影响

程艳1,2,陈璐1,米艳华1*,杨晓宏1,杜丽娟1,段红平2*,李茂萱1   

  1. (1云南省农业科学院质量标准与检测技术研究所, 昆明 650205;2云南农业大学资源与环境学院, 昆明 650201)
  • 出版日期:2019-08-10 发布日期:2019-08-10

Effects of complexed ironbearing material on physiological and biochemical characteristics and arsenic accumulation in Oryza sativa L. under arsenic stress.

CHENG Yan1,2, CHEN Lu1, MI Yan-hua1*, YANG Xiao-hong1, DU Li-juan1, DUAN Hong-ping2*, LI Mao-xuan1   

  1. (1Institute of Agriculture Quality Standards & Testing Technique, Yunnan Academy of Agricultural Science, Kunming 650205, China; 2College of Resource and Environment, Yunnan Agricultural University, Kunming 650201, China).
  • Online:2019-08-10 Published:2019-08-10

摘要: 土壤重金属与农产品质量息息相关。本研究通过设置砷胁迫条件下水稻种植盆栽试验,分析络合型含铁材料不同施用时期和不同施用量对水稻SPAD值、抗氧化酶(SOD、POD、CAT)活性以及水稻砷吸收、累积的影响。结果表明,砷胁迫对水稻SOD、POD、CAT活性有着不同程度的抑制作用,添加络合型含铁材料可以降低水稻MDA含量,缓解砷对水稻光合作用和SOD、POD、CAT活性的抑制;同时能减少水稻对土壤砷的吸收和累积。与移栽前添加络合型含铁材料相比,选择水稻孕穗期前添加络合型含铁材料,水稻砷吸收的抑制效果较好;水稻植株地上部砷含量与络合型含铁材料的添加浓度呈显著负相关,孕穗期前添加0.2 g·kg-1络合型含铁材料对水稻植株砷的吸收抑制效果最好,水稻植株地上部砷含量降低59.22%。

关键词: 红壤, 植被类型, pH, 交换性酸, 剖面特征

Abstract: Heavy metal in soil is closely related to the quality of agricultural products. In this study, a pot experiment with rice (Oryza sativa L.) under arsenic stress was conducted to examine the effects of different application times and concentrations of complexed iron-bearing material on SPAD value, activities of antioxidant enzymes (SOD, POD, CAT), arsenic uptake and accumulation in rice. The results showed that the activities of SOD, POD and CAT were inhibited in rice under arsenic stress. The addition of complexed iron-bearing material reduced MDA concentration, alleviated the inhibition of arsenic on photosynthesis and activities of SOD, POD and CAT in rice, and decreased the arsenic uptake and accumulation. With respect to adding times, adding complexed ironbearing material before booting stage had better effect than adding before transplanting on controlling arsenic uptake in rice. There was a significant negative correlation between the concentration of arsenic in shoot and the application level of complexed iron-bearing material. Adding complexed iron-bearing material at the level of 0.2 g·kg-1 before booting stage had the best effect on alleviating arsenic stress, with a 59.22% reduction of arsenic concentration in shoot.

Key words: red soil, vegetation type, pH, exchangeable acidity, profile distribution.