Acta Agrestia Sinica ›› 2018, Vol. 26 ›› Issue (3): 673-683.DOI: 10.11733/j.issn.1007-0435.2018.03.021

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Effects of Heavy Metals Cu2+, Cd2+ and Pb2+ on Seed Germination and Seedling Growth of 8 Grasses

SUN Jin-jin, YU Xiao-jun, WANG Jin-hui, REN Zhi-hang, WANG Xiao-rui   

  1. Pratacultural College, Gansu Agricultural University, Key Laboratory of Grassland Ecosystem Ministry of Education, Sion-U. S. Centers for Grazing land Ecosystem Sustainability, Pratacultural Engineering Laboratory of Gansu Province, Lanzhou, Gansu Province 730070, China
  • Received:2017-10-13 Revised:2018-06-04 Online:2018-06-15 Published:2018-08-24

重金属Cu2+、Cd2+和Pb2+对8种禾草种子萌发和幼苗生长的影响

孙金金, 鱼小军, 王金辉, 任志航, 王晓瑞   

  1. 甘肃农业大学草业学院, 草业生态系统教育部重点实验室, 中-美草地畜牧业可持续发展研究中心, 甘肃省草业 工程实验室, 甘肃 兰州 730070
  • 通讯作者: 鱼小军
  • 作者简介:孙金金(1995-),女,甘肃漳县人,硕士研究生,主要从事饲草栽培研究,E-mail:1291943917@qq.com
  • 基金资助:

    国家自然科学基金项目(31760695)资助

Abstract:

The effects of different concentrations heavy metals ions included Cu2+(200, 300, 400 and 500 mg·L-1), Cd2+(1, 50, 150 and 200 mg·L-1) and Pb2+(500, 1 000, 1 500 and 2 000 mg·L-1) on the seed germination and seedling growth of eight grasses were studied in this paper with the distilled water as control. The results showed that the heavy metal ion stress on grass seed germination and seedling growth of different plant species and heavy metal varies. With the increase of Cu2+, Cd2+ and Pb2+ concentrations, the relative germination rate, relative germination index and relative vigor index of eight grasses showed different degrees of decline. The effects of different concentrations of Cu2+, Cd2+ and Pb2+ on seedling growth of eight grasses are inhibitory, and "rootless seedlings" appeared under high concentration stress. Comprehensive evaluations of the resistance of grasses seeds to the metal ions during germination stage were done by membership function method. The order of seed resistance during germination period to Cu2+ stress ranked as Zea mays > Sorghum bicolor×Sorghum sudanense > Avena sativa > Secale cereale > Bromus inermis > Lolium perenne > Elymus nutans > Festuca arundinace; to Cd2+ stress was:Sorghum bicolor×Sorghum sudanense > Secale cereale > Zea mays > Avena sativa > Bromus inermis > Elymus nutans > Lolium perenne > Festuca arundinace; while to Pb2+ stress was:Sorghum bicolor×Sorghum sudanense > Avena sativa > Zea mays > Secale cereale > Bromus inermis > Elymus nutans > Lolium perenne > Festuca arundinace.

Key words: Cu2+, Cd2+, Pb2+, Grasses, Seed germination, Seedling growth

摘要:

研究了不同浓度Cu2+(200、300、400和500 mg·L-1)、Cd2+(1、50、150和200 mg·L-1)、Pb2+(500、1 000、1 500和2 000 mg·L-1)对8种禾本科牧草种子萌发和幼苗生长的影响。结果表明:重金属离子胁迫对禾本科植物种子的发芽和幼苗生长的影响因植物种类及重金属离子不同而有差异。随着Cu2+,Cd2+和Pb2+浓度的增大,8种禾本科草种的相对发芽率、相对发芽指数和相对活力指数均呈不同程度的下降。供试不同浓度的Cu2+,Cd2+和Pb2+对8种植物幼苗生长均有抑制作用,高浓度胁迫下会出现“无根苗”。通过采用性状相对值对本试验进行隶属函数值综合评价,8种禾本科植物耐Cu2+的强弱顺序为:玉米 > 高丹草 > 燕麦 > 黑麦 > 无芒雀麦 > 黑麦草 > 垂穗披碱草 > 高羊茅,耐Cd2+的强弱顺序为:高丹草 > 黑麦 > 玉米 > 燕麦 > 无芒雀麦 > 垂穗披碱草 > 黑麦草 > 高羊茅,耐Pb2+的强弱顺序为:高丹草 > 燕麦 > 玉米 > 黑麦 > 无芒雀麦 > 垂穗披碱草 > 黑麦草 > 高羊茅。

关键词: Cu2+, Cd2+, Pb2+, 禾本科草种, 种子萌发, 幼苗生长

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