摘要
通过盆栽试验,研究了钒(V)胁迫下2个甜玉米(Zea mays)品种幼苗中V的积累和化学形态。结果表明:不同品种玉米幼苗中V含量分布均表现为根部远大于茎叶部,玉米幼苗根部富集的V较多。美甜糯八号根部V含量占总量的83.91%~89.09%,益甜608根部V含量占总量的84.59%~92.33%。不同品种玉米茎叶中V化学形态以乙醇提取态(FE)为主;但在根部,美甜糯八号和益甜608分别以盐酸提取态(FHCl)和残渣态(FR)为主,表明美甜糯八号玉米幼苗根中V多为活性较低的有机酸盐、果胶酸盐和蛋白质结合态,而益甜608则以难溶于水的重金属磷酸盐或草酸盐沉积在根部,这就避免了过量V从根部转运到茎叶,减轻了V对玉米幼苗的毒害。益甜608对V的耐性较强。该研究结果可为探讨甜玉米幼苗对V的吸收和耐性机制提供理论依据。
The accumulation and chemical forms of vanadium(V)in the seedlings of two sweet maize(Zea mays)cultivars under V stress were investigated by pot experiment.The results show that the distribution of V content in two sweet maize cultivars was much higher in roots than in shoots,more V enriched by the roots of maize seedlings.The V content of the roots of Meitiannuo No.8 accounted for 83.91%-89.09%of the total,and Yitian 608 was for 84.59%-92.33%.Among the stems and leaves of different maize varieties,the chemical form of V is mainly ethanol extracted(FE),but V speciation were mainly in the chemical forms of HCl extractable(FHCl)and residue state(FR)in roots,respectively.It indicates that V in the roots of Meitiannuo 8 maize was mostly less active organic acid salt,pectin acid salt and protein binding state,while V in Yitian 608 maize was deposited at the root with heavy metal phosphate or oxalate,which is hardly soluble in water,avoiding the ability of excessive V to transfer from the roots to the shoots,reducing the toxicity of V to maize seedlings.Yitian 608 is more resistant to V.The results provide a theoretical basis for exploring the absorption and tolerance mechanism of sweet maize seedlings to V.
作者
侯明
杨心瀚
赵菲菲
霍岩
HOU Ming;YANG Xin-han;ZHAO Fei-fei;HUO Yan(College of Chemistry and Bioengineering,Guilin University of Technology,Guilin 541004,China;Key Laboratory of Food Safety and Detection of Guangxi Colleges and Universities,Guilin 541004,China)
出处
《生态与农村环境学报》
CAS
CSCD
北大核心
2019年第11期1468-1474,共7页
Journal of Ecology and Rural Environment
基金
国家自然科学基金(41561077)
关键词
玉米
钒(V)
积累
化学形态
maize(Zea mays)
vanadium
accumulation
chemical form
作者简介
通信作者:侯明(1957—),女,山东济宁人,教授,博士,主要研究方向为重金属污染控制和生态毒理。E-mail:glhou@glut.edu.cn。
