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纳米氧化铜对砷胁迫下水稻种子发芽及幼苗生长的影响
方清,晏士玮,崔彩云,周彩玲,吴凡,李育键,叶文玲
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(安徽农业大学农田生态保育与污染防控安徽省重点实验室,合肥 230036;铜陵市义安区农业技术推广中心,铜陵 244100;安徽农业大学农田生态保育与污染防控安徽省重点实验室,合肥 230036; 浙江大学污染环境修复与生态健康教育部重点实验室,杭州 310058)
摘要:
为了研究纳米氧化铜(nCuO)对砷(As)胁迫下水稻种子发芽以及幼苗生长的影响,在培养皿中进行12 d的种子发芽试验。结果表明:2 mg·L-1砷处理下,添加低浓度纳米氧化铜(0.5和1 mg·L-1)可以缓解水稻幼苗的砷毒害,添加高浓度的纳米氧化铜(10、20和50 mg·L-1)会抑制水稻种子的发芽率和根长,降低干重。与单独砷处理相比,添加纳米氧化铜可以提高水稻叶片SOD活性(0.5、1和20 mg·L-1)及CAT活性(1、10、20和50 mg·L-1)。水稻地上部和根部砷含量随着纳米氧化铜的加入而降低。由此可见,不同浓度的纳米氧化铜对砷胁迫下种子发芽和幼苗生长的影响不同。
关键词:  纳米氧化铜  砷胁迫  水稻  发芽  生长
DOI:10.13610/j.cnki.1672-352x.20201113.005
基金项目:农田生态保育与污染防控安徽省重点实验室开放基金项目(FECPP201904), 中央高校基本科研业务费专项资金(2019FZJD007)和安徽省科技重大专项(18030701186)共同资助。
Effects of copper oxide nanoparticles on germination and growth of rice seeds exposed to arsenic stress
FANG Qing,YAN Shiwei,CUI Caiyun,ZHOU Cailing,WU Fan,LI Yujian,YE Wenling
(Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention, School of Resources and Environment, Anhui Agricultural University, Hefei 230036;Agricultural Technology Extension Center of Yi'an District, Tongling 244100;Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention, School of Resources and Environment, Anhui Agricultural University, Hefei 230036; Key Laboratory of Environment Remediation and Ecological Health (Zhejiang University), Ministry of Education, Hangzhou 310058)
Abstract:
In order to study the effect of copper oxide nanoparticles (nCuO) on rice seed germination and seedling growth under arsenic (As) stress, the experiment adopted solution culture method to carry out seed germination experiment in petri dishes for 12 days.The results showed that the addition of low concentration copper oxide nanoparticles (0.5 and 1 mg·L-1) could alleviate the arsenic toxicity of rice seedlings under the treatment of 2 mg·L-1 arsenic, and the addition of high concentration copper oxide nanoparticles (10, 20 and 50 mg·L-1) could inhibit the germination rate and root length of rice seeds and reduce the dry weight. Compared with arsenic alone, the addition of copper oxide nanoparticles increased the SOD content (0.5, 1 and 20 mg·L-1) and CAT content (1, 10, 20 and 50 mg·L-1) in the shoot. Arsenic content in the root and ground decreased with the addition of copper oxide nanoparticles. It assumed that different concentrations of copper oxide nanoparticles have different effects on seed germination and seedling growth under arsenic stress.
Key words:  copper oxide nanoparticles  arsenic stress  rice  germination  growth

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