外源硒对铅胁迫下小白菜生理特性及铅、硒吸收的影响

赵秀峰; 程 滨; 霍晓兰; 赵瑞芬; 滑小赞

引用本文:	赵秀峰,程滨,霍晓兰,等.外源硒对铅胁迫下小白菜生理特性及铅、硒吸收的影响[J].灌溉排水学报,2018,37(2):52-57.
	ZHAO Xiufeng,CHENG Bin,HUO Xiaolan,et al.外源硒对铅胁迫下小白菜生理特性及铅、硒吸收的影响[J].灌溉排水学报,2018,37(2):52-57.

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外源硒对铅胁迫下小白菜生理特性及铅、硒吸收的影响
赵秀峰，程滨，霍晓兰，赵瑞芬，滑小赞
山西省农业科学院农业环境与资源研究所，太原 030031

摘要:

【目的】探讨铅胁迫下硒对小白菜生理特性及对铅、硒吸收的影响。【方法】采用水培方式，研究了不同质量浓度的硒对铅胁迫下小白菜生长、抗氧化酶及对铅、硒吸收的影响。【结果】当硒质量浓度≤2.0 mg/L时，对小白菜的生长有一定的促进作用，具体表现为小白菜株高、根长、地上部和地下部干质量以及叶绿素量均增加。低质量浓度硒（Se≤2.0 mg/L）显著降低了小白菜叶片和根中丙二醛（MDA）量以及超氧化物歧化酶（SOD）、过氧化物酶（POD）和过氧化氢酶（CAT）的活性。铅硒复合处理下，小白菜地上部含铅量随外源硒量的增加先减少后增加，且当外源硒的质量浓度为2.0 mg/L时，小白菜地上部含铅量最低，地下部含铅量随外源硒量的增加先增加后减少。【结论】2.0 mg/L的硒能减缓铅对小白菜的胁迫，且效果最好，外源硒能促使铅富集在小白菜地下部，抑制铅向地上部的转运。

关键词: 铅胁迫；硒；小白菜；生理特性；吸收

DOI：10.13522/j.cnki.ggps.2017.0324

分类号:

基金项目:

Effects of Selenium on the Physiological Characteristics, Uptake of Pb and Se by Pak Choi under Pb Stress

ZHAO Xiufeng, CHENG Bin, HUO Xiaolan, ZHAO Ruifen, HUA Xiaozan

Institute of Agricultural Environment and Resource, Shanxi Academy of Agricultural Sciences, Taiyuan 030031, China

Abstract:

【Objective】 Study the effects of selenium (Se) on physiological characteristics and uptake of plumbum(Pb) and Se of pak choi (Brassica chinensis L.) under Pb stress. 【Method】 Hydroponics experiments were conducted to study the effects of different selenium (Se) levels(1, 2, 4 and 8 mg/L) on physiological characteristics and uptake of plumbum (Pb) and Se of pak choi (Brassica chinensis L.)， when exposed for 15 days to different Pb levels (0 and 100 mg/L).【Result】 Shoot height, root length, shoot and root biomass, and chlorophyll content could be improved by a proper amount of Se (Se≤2.0 mg/L) in pak choi leaves. Malondialdehyde (MDA) contents and activities of superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT) could be reduced by a proper amount of Se (Se≤2.0 mg/L) in leaves and roots. In the combined Pb-Se treatment, the content of Pb in shoots of pak choi decreased first and then increased with the increase of Se concentration, while the Pb content in shoots was lowest when Se concentration was 2.0 mg/L. The content of Pb in roots of pak choi increased first and then decreased with the increase of Se concentration. 【Conclusion】 The application of Se at 2.0 mg/L has good ameliorating effect against Pb stress in pak choi by inhibiting the transport of Pb from roots to the shoots, thus led to the enrichment of Pb in roots and considerably decrease the Pb content in shoots.

Key words: plumbum stress; selenium; pak choi; physiological characteristics; uptake