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草业学报 ›› 2016, Vol. 25 ›› Issue (8): 91-97.DOI: 10.11686/cyxb2015501

• 研究论文 • 上一篇    下一篇

不同盐生境下硅对高羊茅生物量及生理生化特征的影响

宋锐, 林丽果, 王康英, 宋浩然, 蒋勇斌, 刘慧霞*   

  1. 西北民族大学生命科学与工程学院,甘肃 兰州 730030
  • 收稿日期:2015-11-03 修回日期:2016-01-26 出版日期:2016-08-20 发布日期:2016-08-20
  • 通讯作者: liuhuixia2@aliyun.com
  • 作者简介:宋锐(1989-),男,山西大同人,在读硕士。E-mail: 616679167@qq.com
  • 基金资助:
    国家自然科学基金项目(31360581),中央高校基本科研业务费项目(31920130050),西北民族大学研究生科研创新项目(Yxm2014181),西北民族大学本科生众创空间项目和西北民族大学创新团队计划项目资助

Effects of silicon supply on the biomass and physiochemical features of tall fescue seedlings under different salinization conditions

SONG Rui, LIN Li-Guo, WANG Kang-Ying, SONG Hao-Ran, JIANG Yong-Bin, LIU Hui-Xia*   

  1. College of Life Science and Engineering, Northwest University for Nationalities, Lanzhou 730030, China
  • Received:2015-11-03 Revised:2016-01-26 Online:2016-08-20 Published:2016-08-20

摘要: 利用水培实验研究了不同盐生境下硅对高羊茅幼苗生物量及生理生化特征的影响。研究结果表明,高羊茅幼苗生物量随着盐浓度增加而逐渐降低,200 mmol/L的盐浓度为高羊茅幼苗的临界盐浓度,盐浓度小于该临界值时,添加硅显著增加了高羊茅幼苗生物量;盐浓度大于该临界值时,硅对高羊茅幼苗生物量没有明显影响,说明硅调节盐生境下高羊茅的生长能力与环境内的盐浓度密切相关。在盐浓度临界值之内,水培条件下硅通过增加盐胁迫下高羊茅幼苗体内SOD、CAT、POD活性,降低盐胁迫条件下高羊茅幼苗体内的丙二醛、脯氨酸、可溶性糖含量和相对电导率,其中盐浓度为100 mmol/L时,丙二醛含量降幅最大,为18.05%,当盐浓度为50 mmol/L时,脯氨酸含量降幅最大,为23.63%。这不仅说明了硅可增强高羊茅幼苗适应盐生境的能力,而且证明了硅直接参与了盐胁迫条件下高羊茅的生理生化过程。

Abstract: The effect of silicon supply on the biomass and physiochemical features of tall fescue seedlings was investigated under different salinization conditions using a water culture experiment. Biomass decreased as salt concentration increased, with 200 mmol/L proving to be the critical concentration for tall fescue seedlings. When salt concentration was less than 200 mmol/L, silicon addition significantly increased seedling biomass, indicating that the effectiveness of silicon on tall fescue is closely related to salt concentration. If the concentration was more than 200 mmol/L, there was no significant effect of silicon addition on biomass. Under water culture, the activities of SOD, CAT and POD were increased and the contents of malondialdehyde, proline and water soluble sugars, and relative conductivity, were decreased by adding silicon to seedlings under salt stress below the critical concentration. The most significant reduction in MDA content (18.05%) was when salt concentration was 100 mmol/L. The most significant decline in proline content (23.63%) was when salt concentration was 50 mmol/L. The results indicate that the adaptability to salinization of tall fescue seedlings is improved by adding silicon and that silicon may be directly involved in the seedlings’ physiochemical processes.