镉镍胁迫对3种草本植物种子萌发及幼苗生长的影响

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中文摘要：为评价和比较草本植物杂交狼尾草(Pennisetum americanum×P。purpureum)、黄花草木樨(Melilotus officinalis)和高羊茅(Festuca arundinacea)的耐镉镍特性，丰富镉镍污染土壤修复的物种库。本研究以3种草本植物种子为试验材料，通过种子萌发试验，研究不同质量浓度的镉镍单一及复合胁迫对3种草本植物种子萌发及幼苗生长的影响。结果表明:1)低浓度的镉镍单一及复合胁迫对3种植物具有促进作用。与对照组(仅添加蒸馏水)相比，3种草本植物在单一镉浓度为10 mg·L-1时发芽率达到峰值，单一镍浓度为10 mg·L-1时活力指数达到峰值，当镉镍复合胁迫浓度为10 mg·L-1时杂交狼尾草的活力指数、高羊茅的发芽指数和黄花草木樨的总干重与对照组相比均显著增加(P<0。05)。2)随镉镍单一及复合浓度增加，3种草本植物的种子萌发和幼苗生长均受到抑制。当单一镉浓度为200 mg·L-1、镍浓度为300 mg·L-1以及两者复合胁迫时对3种植物生长抑制效果最显著(P<0。05)，其中活力指数和根长的下降幅度最大。3)通过对3种草本植物耐镉镍胁迫能力进行隶属函数综合评价，表明3种植物对镉镍胁迫均具备一定耐受能力，其中杂交狼尾草的耐性最强，可选作镉镍污染土壤的种植植物。

外文标题：Effects of cadmium and nickel single and combined stress on the seed germination and seedling growth of three herbaceous plants

外文摘要：The aim of this study was to assess and compare the tolerance levels of three herbaceous plants, Pennisetum americanum × P. purpureum, Melilotus officinalis, and Festuca arundinacea, towards cadmium and nickel stress. The objective was to expand the range of species suitable for rehabilitating soils contaminated with these metals. Seed germination tests and seedling growth experiments were conducted using seeds obtained from these plants. The results indicated that the germination rate of the three plants was highest at a specific cadmium concentration of 10 mg·L-1 compared to the control group. Similarly, the vigor index reached its maximum value at a specific nickel concentration of 10 mg·L-1. When exposed to combined cadmium-nickel stress at a concentration of 10 mg·L-1, Pennisetum americanum × P. purpureum exhibited a significantly greater vigor index, F. arundinacea showed a increase in germination index, and M. officinalis demonstrated a increase in total dry weight compared to the control group. The germination and seedling growth of the three plants were hindered by increased levels of cadmium and nickel, both individually and in combination. The combined stressors of 200 mg·L-1 cadmium and 300 mg·L-1 nickel had the most significant inhibitory effects on plant growth, as indicated by decreased vigor index and root length. The study also evaluated the cadmium tolerance traits of the three plants and found that they all exhibited a certain level of tolerance to cadmium stress, with P. americanum × P. purpureum showing the highest tolerance. This suggests that P. americanum × P. purpureum have potential as remediation species in cadmium-contaminated soils.

外文关键词：

combined stresscomprehensive evaluationFestuca arundinaceaheavy metalMelilotus officinalismembership functionPennisetum americanum × P. purpureum

作者：

王永吉、关正、解丽媛、赵茹霞、李伊凡、关正萍、张粉果

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作者单位：

山西师范大学生命科学学院, 山西太原 030031

中国科学院大学, 北京 100190

中国科学院植物研究所植被与环境变化国家重点实验室, 北京 100093

山西师范大学食品科学学院, 山西太原 030031

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关键词：

重金属复合胁迫杂交狼尾草高羊茅黄花草木樨隶属函数综合评价

基金：

国家自然科学基金国家自然科学基金山西省基础研究计划山西省基础研究计划山西省留学回国人员科技活动择优资助项目山西省留学回国人员科技活动择优资助项目山西省回国留学人员科研项目山西师范大学研究生科技创新项目

项目编号：

418010273170043420220302121125020220302121125220230025202300272023-1102021XSY034

出版年：

2024

DOI：

10.11829/j.issn.1001-0629.2023-0347

草业科学

中国草原学会兰州大学草地农业科技学院

草业科学

CSTPCD北大核心

影响因子：0.854

ISSN：1001-0629

年,卷(期)：2024.41(3)

参考文献量27