锑胁迫对桑树生理指标及富集转运特征的影响

耿丽莎; 杨再福; 许志楠; 舒文君; 朱彤

文章摘要

耿丽莎,杨再福,许志楠,舒文君,朱彤.锑胁迫对桑树生理指标及富集转运特征的影响[J].农业环境科学学报,2020,39(8):1667-1674.

锑胁迫对桑树生理指标及富集转运特征的影响

Effects of antimony stress on physiological indexes and enrichment and transport characteristics of mulberry

投稿时间：2020-01-07

DOI：10.11654/jaes.2020-0030

中文关键词: 锑桑树生理生化富集转运

英文关键词: antimony mulberry physiology and biochemistry enrichment transport

基金项目:

作者	单位	E-mail
耿丽莎	东华大学环境科学与工程学院, 上海 201620
杨再福	东华大学环境科学与工程学院, 上海 201620	zzfyang@dhu.edu.cn
许志楠	东华大学环境科学与工程学院, 上海 201620
舒文君	东华大学环境科学与工程学院, 上海 201620
朱彤	东华大学环境科学与工程学院, 上海 201620

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中文摘要:

为探讨桑树（Morus alba L.）应对锑（Antimony，Sb）胁迫的响应机制以及对锑污染的累积修复效果，采用土培法，以2年生桑树幼苗为实验材料，设置Sb³⁺（50、100、200、300 mg·kg^-1），Sb⁵⁺（100、200、400、600 mg·kg^-1）和Sb³⁺+Sb⁵⁺（25+50、50+100、100+200、150+300 mg·kg^-1）12个浓度，研究不同价态、不同浓度锑处理对桑叶叶绿素含量、超氧化物歧化酶（SOD）、过氧化氢酶（CAT）、丙二醛（MDA）含量、谷胱甘肽（GSH）含量的影响，测定桑树各部位锑含量并计算富集转运系数。结果显示，单一和复合锑胁迫都会抑制桑叶的叶绿素合成，对于SOD和CAT活性，各处理都呈现出低浓度促进，高浓度抑制的现象，锑胁迫下MDA含量较对照组有显著增加，各个锑处理的富集系数均小于对照组。研究表明，单一Sb³⁺胁迫下桑树中锑分布为根 > 枝 > 茎 > 叶，Sb³⁺、Sb⁵⁺复合胁迫下桑树锑分布为根 > 茎 > 叶> 枝，锑污染程度的增加抑制了桑树根向桑叶运输锑的能力，减小了桑树的富集能力。

英文摘要:

In order to explore the response mechanism and cumulative remediation effect of mulberry(Morus alba L.)under Sb stress, the soil culture method was used in this experiment. Two year old mulberry was used as the experimental material, and 12 concentration gradients were set for Sb³⁺(50, 100, 200, and 300 mg·kg^-1), Sb⁵⁺(100, 200, 400, and 600 mg·kg^-1), and Sb³⁺+Sb⁵⁺(25 + 50, 50 + 100, 100 + 200, and 150 + 300 mg·kg^-1).The contents of chlorophyll, superoxide dismutase(SOD), catalase(CAT), malondialdehyde(MDA), and glutathione in mulberry leaves were determined under different Sb treatments. The Sb content in various parts of the mulberry plant was measured and the enrichment transfer coefficient was calculated. The results showed that both single and compound Sb stress can inhibit the synthesis of chlorophyll in mulberry leaves. For the SOD and CAT activities, each treatment showed that a low concentration increased activity and high concentration inhibited activity. Compared with the control group, the content of MDA significantly increased under Sb stress. The bioconcentration factors of each Sb treatment was smaller than that of the control group. The results showed that the distribution of Sb in mulberry under single Sb³⁺ stress was root > branch > stem > leaf, and was root > stem > leaf > branch under root Sb³⁺ and Sb⁵⁺ stress. The increase in Sb contamination inhibits the transportation of Sb from mulberry roots to mulberry leaves and reduces the enrichment ability of mulberry.

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