外源ABA对镉胁迫下柳枝稷生理特性及镉吸收的影响

doi:10.11733/j.issn.1007-0435.2022.01.015

草地学报 ›› 2022, Vol. 30 ›› Issue (1): 118-124.DOI: 10.11733/j.issn.1007-0435.2022.01.015

• 研究论文 • 上一篇

外源ABA对镉胁迫下柳枝稷生理特性及镉吸收的影响

肖霄¹, 方志刚², 纪燕玲¹, 娄来清¹, 常明¹, 蔡庆生¹

1. 南京农业大学生命科学学院，江苏南京 210095;
2. 喀什大学生命与地理科学学院，新疆喀什 844000

收稿日期:2021-05-07 修回日期:2021-09-21 发布日期:2022-01-27
通讯作者: 蔡庆生, E-mail: qscai@njau.edu.cn
作者简介:肖霄(1996-)，女，湖北荆州人，硕士研究生，主要从事能源植物环境生理研究，E-mail: 2018116001@njau.edu.cn
基金资助:
国家自然科学基金(31372359)；江苏省社会发展科技项目(BE2014709)资助

Effects of Exogenous ABA on Physiological Characteristics and Cadmium Uptake of Switchgrass under Cadmium Stress

XIAO Xiao¹, FANG Zhi-gang², JI Yan-ling¹, LOU Lai-qing¹, CHANG Ming¹, CAI Qing-sheng¹

1. College of Life Science, Nanjing Agricultural University, Nanjing, Jiangsu Province 210095 China;
2. College of Life and Geographic Sciences, Kashi University, Kashi, Xinjiang Province 844000, China

Received:2021-05-07 Revised:2021-09-21 Published:2022-01-27

摘要/Abstract

摘要： 为探究外源脱落酸(Abscisic acid，ABA)缓解柳枝稷(Panicum virgatum)镉(Cd)毒害效应及可能产生的生理机制，本试验以2个柳枝稷品种'Alamo’与'Cave in Rock’为材料，在水培条件下，研究了外源1 μmol·L^-1ABA预处理对20 μmol·L^-1镉(Cd²⁺)胁迫下柳枝稷幼苗生物量、根系形态、膜脂过氧化物及脯氨酸等指标的影响。结果表明：Cd显著抑制柳枝稷生长，'Cave in Rock’比'Alamo’的耐Cd性强，但'Alamo’具有较高的Cd积累量及转运能力。与单独Cd胁迫相比，1 μmol·L^-1ABA预处理可显著增加柳枝稷根长、根表面积和根尖数，提高根系活力、脯氨酸(Proline，Pro)及叶片相对含水量，降低植株中丙二醛(Malondialdehyde，MDA)含量，显著促进'Alamo’对Cd的吸牧。根据本试验结果，在Cd污染土地上，推荐种植柳枝稷'Alamo’品种，并用低浓度ABA处理，有利于促进植株生长的同时，提高Cd污染土壤的修复效率。

关键词: 脱落酸, 柳枝稷, 镉, 生理机制, 修复

Abstract: To investigate the effects of exogenous ABA(Abscisic acid, ABA)on alleviating cadmium toxicity in switchgrass(Panicum virgatum) and its possible physiological mechanisms, two switchgrass varieties 'Alamo' and 'Cave in Rock' were used in the experiment. The effects of 1 μmol·L^-1 (ABA) pretreatment on biomass, root morphology, membrane lipid peroxidation and proline of switchgrass seedlings under hydroponic culture conditions with addition 20 μmol·L^-1 Cd²⁺ were investigated. The results showed that Cd significantly inhibited the growth of switchgrass. 'Cave in Rock' was more tolerant to Cd than 'Alamo', but 'Alamo' had a higher Cd accumulation and translocation capacity than 'Cave in Rock'. Compared with Cd stress alone, 1 μmol·L^-1ABA pretreatment significantly increased root length, root surface area and root tip number, increased root vigour, proline (Pro) and relative water content of leaves, reduced malondialdehyde (MDA) content in the plant and promoted Cd uptake of 'Alamo'. The results suggest that planting 'Alamo' and treating it with low concentrations of ABA is recommended on Cd-contaminated land to promote plant growth while improving the remediation of Cd-contaminated soil.

Key words: Abscisic acid, Switchgrass, Cd, Physiological mechanism, Remediation

中图分类号:

Q945

肖霄, 方志刚, 纪燕玲, 娄来清, 常明, 蔡庆生. 外源ABA对镉胁迫下柳枝稷生理特性及镉吸收的影响[J]. 草地学报, 2022, 30(1): 118-124.

XIAO Xiao, FANG Zhi-gang, JI Yan-ling, LOU Lai-qing, CHANG Ming, CAI Qing-sheng. Effects of Exogenous ABA on Physiological Characteristics and Cadmium Uptake of Switchgrass under Cadmium Stress[J]. Acta Agrestia Sinica, 2022, 30(1): 118-124.

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外源ABA对镉胁迫下柳枝稷生理特性及镉吸收的影响

Effects of Exogenous ABA on Physiological Characteristics and Cadmium Uptake of Switchgrass under Cadmium Stress

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