河南农业科学 ›› 2022, Vol. 51 ›› Issue (8): 117-127.DOI: 10.15933/j.cnki.1004-3268.2022.08.014

• 园艺 • 上一篇    下一篇

超声波对盐胁迫下紫松果菊种子萌发和幼苗生理特性的影响

尹娟,朱庆松,赵晶晶,曹永奕,马桂花
  

  1. (信阳农林学院,河南 信阳 464000)
  • 收稿日期:2022-02-18 出版日期:2022-08-15 发布日期:2022-09-23
  • 通讯作者: 朱庆松(1976-),河南信阳人,副教授,主要从事设施园艺栽培技术研究。E-mail:357734686@qq.com
  • 作者简介:尹娟(1979-),河南信阳人,副教授,硕士,主要从事园林植物栽培与景观应用研究。E-mail:120987290@qq.com
  • 基金资助:
    河南省高等学校重点科研项目(19A220005)

Effects of Ultrasound on Seed Germination and Seedling Physiological Characteristics of Echinacea purpurea under Salt Stress

YIN Juan,ZHU Qingsong,ZHAO Jingjing,CAO Yongyi,MA Guihua   

  1. (Xinyang College of Agriculture and Forestry,Xinyang 464000,China)
  • Received:2022-02-18 Published:2022-08-15 Online:2022-09-23

摘要: 以紫松果菊种子为材料,利用不同时长(0、5、25、45 min)的超声波预处理,通过滤纸床发芽和盆栽幼苗生长试验,研究不同含量盐胁迫(0、0.45%、0.90% NaCl)条件下种子的萌发和幼苗生理特性。结果表明,盐胁迫下,紫松果菊种子萌发明显受到抑制,盐含量越高胁迫抑制作用越强。种子通过超声波处理后发芽率、发芽势、发芽指数、活力指数、幼苗地上干质量和根干质量,以及幼苗叶片内超氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)活性整体上均得到明显提高。另外,在盐胁迫下,适量超声波处理能通过调节根系脯氨酸、可溶性糖、可溶性蛋白含量来缓解胁迫作用。与0 min(UaS1)相比,低盐(0.45% NaCl)胁迫下,25 min超声波处理组脯氨酸、可溶性糖含量分别降低了27.23%、12.23%,可溶性蛋白含量提高了92.81%;与0 min(UaS2)相比,高盐(0.90% NaCl)胁迫下,25 min超声波处理组脯氨酸、可溶性糖含量分别降低了11.43%、12.75%,可溶性蛋白含量则提高了87.83%。综上,适量超声波处理对紫松果菊种子萌发和幼苗生长起着一定的促进作用,增强了紫松果菊幼苗对盐胁迫的抗逆性,超声波处理时长以25 min为宜。

关键词: 超声波, 盐胁迫, 紫松果菊, 种子萌发, 生理特性

Abstract: E.purpurea seeds were taken as materials,seed germination and seedling physiological characteristics of E.purpurea under different salt stress(0,0.45%,0.90% NaCl)were studied by using ultrasonic pretreatment with different time(0,5,25,45 min),filter paper bed method and potted seedling growth experiments.The results showed that the germination of E.purpurea seeds was significantly inhibited under salt stress,and the higher the salt content,the stronger the stress inhibition.Seed germination rate,germination potential,germination index,vigor index,aboveground dry weight and root dry weight of seedlings,and the activities of superoxide dismutase(SOD),peroxidase(POD)and catalase(CAT)in seedling leaves were significantly improved after ultrasonic treatment.In addition,appropriate ultrasonic treatment under salt stress could alleviate the stress by adjusting the content of proline,soluble sugar and soluble protein in roots.Compared with 0 min(UaS1),under low salt(0.45% NaCl)stress,the content of proline and soluble sugar decreased by 27.23% and 12.23% respectively,and the content of soluble protein increased by 92.81%.Compared with 0 min(UaS2),under high salt(0.90% NaCl)stress,the content of proline and soluble sugar decreased by 11.43% and 12.75% respectively,and the content of soluble protein increased by 87.83%.In conclusion,proper amount of ultrasonic treatment can promote the seed germination and seedling growth of E.purpurea,and enhance the resistance of seedlings to salt stress.The optimum ultrasonic treatment time was 25 min.

Key words: Ultrasound, Salt stress, E. purpurea, Seed germination, Physiological characteristic

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