欢迎访问《草业学报》官方网站,今天是 分享到:

草业学报 ›› 2022, Vol. 31 ›› Issue (11): 139-146.DOI: 10.11686/cyxb2021463

• 研究论文 • 上一篇    下一篇

重金属铜和铅胁迫对东方山羊豆幼苗生长及生理特性的影响

穆海婷(), 王英哲, 苗一凡, 郁伟杰, 徐博()   

  1. 吉林农业大学林学与草学学院,吉林 长春 130118
  • 收稿日期:2021-12-13 修回日期:2022-02-28 出版日期:2022-11-20 发布日期:2022-10-01
  • 通讯作者: 徐博
  • 作者简介:E-mail: xubo6299@jlau.edu.cn
    穆海婷(1997-),女,安徽宿州人,在读硕士。E-mail: 1721072134@qq.com
  • 基金资助:
    吉林省科学技术厅科技发展计划项目(20210202069nc);吉林省教育厅科学技术研究项目(JJKH20210371KJ)

Effects of heavy metal Cu and Pb stress on the growth and physiological characteristics of Galega orientalis seedlings

Hai-ting MU(), Ying-zhe WANG, Yi-fan MIAO, Wei-jie YU, Bo XU()   

  1. School of Forestry and Herbology,Jilin Agricultural University,Changchun 130118,China
  • Received:2021-12-13 Revised:2022-02-28 Online:2022-11-20 Published:2022-10-01
  • Contact: Bo XU

摘要:

为研究土壤中Cu、Pb胁迫对东方山羊豆幼苗生长及生理特性的影响,本试验以东方山羊豆为材料,采用盆栽进行胁迫试验,研究5种浓度的Cu、Pb胁迫下东方山羊豆生长及生理特性指标的变化规律。结果表明:随着2种金属胁迫浓度和胁迫时间的增加,在胁迫第7天,胁迫浓度达480 mg·kg-1时,东方山羊豆芽长、根长、叶鲜重、根鲜重总体呈上升趋势,但随着胁迫浓度增加和处理时间的延长,在Pb胁迫第15天,根长在处理浓度为600 mg·kg-1时,与CK相比降低23.60%。而东方山羊豆的脯氨酸、过氧化物酶随着胁迫浓度的增加总体呈现不断上升的趋势。当Pb浓度小于480 mg·kg-1,随着Pb浓度的增加,植物体内丙二醛含量呈上升趋势,当处理浓度为600 mg·kg-1时,东方山羊豆幼苗的丙二醛含量出现明显下降,而在Cu处理下,丙二醛含量呈上升的趋势。可溶性糖含量在Pb胁迫下,随着浓度的不断增加,呈先上升后下降的趋势,在Cu浓度低于480 mg·kg-1时,东方山羊豆的可溶性糖含量均低于CK。可溶性蛋白含量则在Pb胁迫下呈先下降后上升的趋势,与CK相比,在处理浓度为600 mg·kg-1时,可溶性蛋白含量增加78.35%。Cu胁迫浓度在240 mg·kg-1时,植物的可溶性蛋白含量显著高于600 mg·kg-1时,并在此时达到最大值,而随着胁迫浓度增加,可溶性蛋白含量呈下降趋势。综上表明,在重金属Cu和Pb的胁迫下,东方山羊豆表现出一定的耐受力和富集重金属铜和铅的能力。

关键词: 东方山羊豆, 铜胁迫, 铅胁迫, 生理特性

Abstract:

This research studied the effects of stress from elevated soil Cu and Pb on seedling growth and physiological characteristics of Galega orientalis. The experiment was a pot trial with plants grown in an artificial soil made up of humus, perlite and vermiculite mixed 4∶1∶1 and treatments included a control (CK) and four concentrations of Cu and Pb stress (240, 360, 480 or 600 mg·kg–1 applied with irrigation water). Measurements of seedling shoot and root length and fresh weight were made at 7 and 15 days and physiological indices such as shoot malondialdehyde, proline and soluble sugar and protein levels and peroxidase activity were measured at 21 days. It was found that the shoot length, root length, shoot fresh weight and root fresh weight of G. orientalis showed a pattern of overall increase compared to CK at the lower two Cu and Pb concentrations and shorter stress exposure time, but with increased stressor concentration and exposure duration, root length was decreased by 23.60% compared with CK at the treatment concentration of 600 mg Pb·kg–1 and 15 days of Pb exposure. Proline and peroxidase levels in G. orientalis exhibited an overall pattern of constant increase with increase in stressor concentration. With increase in Pb concentration, the malondialdehyde content in plants increased with Pb concentration up to an exposure level of 480 mg Pb·kg–1, but showed a significant decrease at 600 mg Pb·kg–1, while under stress from Cu exposure the malondialdehyde content showed a pattern of continuing increase with increase in Cu concentration. The soluble sugar content initially increased and then decreased with increasing Pb concentration while at Cu concentrations of 240 and 360 mg Cu·kg–1, the soluble sugar content of G. orientalis was lower than for CK plants. The soluble protein content was decreased at lower levels of Pb stress, but at the treatment concentration of 600 mg Pb·kg–1 was increased by 78.35%, compared to CK. Under Cu treatment, the soluble protein content of the plants showed a pattern of decrease with increasing stress concentration and was significantly lower at 600 mg Cu·kg–1 than at 240 mg Cu·kg–1. In conclusion, this experiment showed that G. orientalis has a measure of tolerance to Cu and Pb stress, and an ability for uptake of these heavy metals.

Key words: Galega orientalis, copper stress, lead stress, physiological characteristics