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园艺学报 ›› 2018, Vol. 45 ›› Issue (10): 1989-1998.doi: 10.16420/j.issn.0513-353x.2018-0052

• 研究论文 • 上一篇    下一篇

绒毛白蜡根区局部盐胁迫对其生长的影响

段丽君,李国元*,汪殿蓓   

  1. 湖北工程学院生命科学技术学院,湖北孝感 432000
  • 出版日期:2018-10-25 发布日期:2018-10-25
  • 基金资助:

    国家自然科学基金项目(31370302);湖北省教育厅科学研究计划指导性项目(B2017166);湖北工程学院小城镇科研项目(2016k001)

Effect of Partial Root-zone Salt Stress on Velvet Ash(Fraxinus velutina)Growth

DUAN Lijun,LI Guoyuan*,and WANG Dianbei   

  1. Institute of Biological Technology and Sciences,Hubei Engineering University,Xiaogan,Hubei 432000,China
  • Online:2018-10-25 Published:2018-10-25

摘要:

绒毛白蜡(Fraxinus velutina)是滨海盐渍区主要的植被和园林绿化乔木,其发达的根系易受土壤盐分异质性的影响。为探索局部盐胁迫对其生长的影响,采用分根培养桶对幼苗进行局部盐胁迫处理,分析幼苗的生长特征、光合特性、根系分布和离子积累。结果表明,局部低盐胁迫处理的幼苗生长量显著高于均匀盐胁迫和局部高盐胁迫处理;虽然局部高盐胁迫对叶片的水势无影响,但是显著降低了叶片的气孔导度、光合速率和蒸腾速率。局部盐胁迫处理中,无盐胁迫区的根系生物量显著高于盐胁迫区;与均匀盐胁迫相比,局部盐胁迫能够显著降低叶片中Na+的含量,增加K+/Na+。虽然绒毛白蜡的生长在局部盐胁迫条件下受到抑制,且局部盐分越高抑制越强,但生长量与均匀盐胁迫相比显著增高。在局部盐胁迫条件下,细根在无胁迫区的补偿性生长能够提供叶片所需水分,降低叶片中Na+的积累,增加K+含量,缓解了盐胁迫的不利影响。

关键词: 绒毛白蜡, 分根, 局部盐胁迫, 生物量, 根系分布, 离子积累

Abstract:

Velvet ash(Fraxinus velutina)is widely planted in the coastal saline land for vegetation construction. Salt distribution in saline soil usually is un-uniform,so velvet is affected by the heterogeneous soil salinity due to its large root system. In this study,the growth character,photosynthesis parameters,root distribution and leaf ion accumulation of velvet ash seedlings were analyzed by the split root pots method under partial root-zone salt stress. The results showed that,growth of velvet ash seedlings under partial low salt stress was significantly higher than that of the uniform salt stress and partial high salt stress. There was no effect of partial high salt stress on the leaf water potential,but leaf stomatal conductance,net photosynthetic rate and transpiration rate were significantly lower than the control. Root biomass,especially the fine root biomass,in the salt-free stressed zone was significantly higher than that of the salt stress zone. Compared with uniform salt stress,partial salt stress had significantly reduced leaf Na+ content and increased the K+/Na+. The growth of velvet ash seedlings was inhibited with partial salt stress,and the higher of salinity in one part,the lower of growth rate,while biomass was significantly higher than the uniform salt stress. Under partial salt stress,the compensatory growth of fine root in the salt-free stress zone could abtain more water,reduce leaf Na+ accumulation and increase leaf K+ content to alleviate the salt stress.

Key words: velvet ash, Fraxinus velutina, split root, partial salt stress, biomass, root distribution, ion accumulation

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