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草业学报 ›› 2024, Vol. 33 ›› Issue (11): 69-83.DOI: 10.11686/cyxb2023475

• 研究论文 • 上一篇    下一篇

虎尾草伴生和丛枝菌根真菌对碱胁迫下羊草生长的影响

卢晓瑜(), 刘雅洁, 白彩霞, 李进华, 王子贺, 杨春雪()   

  1. 东北林业大学园林学院,黑龙江 哈尔滨 150040
  • 收稿日期:2023-12-12 修回日期:2024-01-19 出版日期:2024-11-20 发布日期:2024-09-09
  • 通讯作者: 杨春雪
  • 作者简介:E-mail: senxiu99@163.com
    卢晓瑜(2000-),女,山东济南人,在读硕士。E-mail: luxiaoyu0602@163.com
  • 基金资助:
    国家自然科学基金青年科学基金项目(31601986);黑龙江省博士后科研启动基金项目(LBH-Q16005)

Effects of Chloris virgata and arbuscular mycorrhizal fungi on the growth of Leymus chinensis under alkali stress

Xiao-yu LU(), Ya-jie LIU, Cai-xia BAI, Jin-hua LI, Zi-he WANG, Chun-xue YANG()   

  1. College of Landscape Architecture,Northeast Forestry University,Harbin 150040,China
  • Received:2023-12-12 Revised:2024-01-19 Online:2024-11-20 Published:2024-09-09
  • Contact: Chun-xue YANG

摘要:

羊草和虎尾草是松嫩盐碱草地常见的抗盐碱、耐瘠薄植物,能够与丛枝菌根(AM)真菌良好共生,并常伴生存在。为探究虎尾草伴生和AM真菌对羊草侵染及耐碱能力的影响,以羊草为寄主植物,虎尾草为伴生种,松嫩盐碱草地羊草根围土AM真菌群落为菌剂进行盆栽控制试验,设计接菌、伴生、碱胁迫3个变量因素,通过观测菌根侵染、羊草生长以及叶片叶绿素含量、丙二醛(MDA)含量、抗氧化酶活性和渗透调节物质含量以分析碱胁迫下虎尾草伴生和AM真菌接种对羊草生理生长的影响。结果表明:1)AM真菌在碱胁迫下能与羊草建立良好的共生关系,虎尾草在碱胁迫下抑制羊草与AM真菌共生关系的建立。2)碱胁迫下AM真菌能够通过显著降低羊草植株MDA含量,提高其单株生物量、叶绿素含量、抗氧化酶活性和渗透调节物质积累等途径增强羊草耐碱能力。3)虎尾草与羊草伴生在非碱胁迫条件下会降低羊草单株生物量,但是其在胁迫条件下会通过调整羊草渗透调节物质含量、酶活性等缓解羊草损伤,促进其生长。4)虎尾草与AM真菌互作提高了羊草叶片宽度、饱和鲜重、叶绿素含量、可溶性糖含量、可溶性蛋白含量,且增强了羊草过氧化物酶(POD)、过氧化氢酶(CAT)活性。5)隶属函数分析表明,AM真菌与虎尾草均可提高羊草对盐碱生境的耐受性。研究结果可为解析碱胁迫下虎尾草伴生及AM真菌共生对羊草生长的调节作用提供一定的理论基础,同时为引入适宜的伴生植物种和利用菌根技术修复松嫩盐碱草地提供重要参考依据。

关键词: 羊草, 虎尾草, 丛枝菌根真菌, 碱胁迫

Abstract:

Leymus chinensis and Chloris virgata are common plants that are able to tolerate the barren, saline-alkali soils of the Songnen grassland. This research investigated the effects of C. virgata and arbuscular mycorrhizal (AM) fungi on the alkali tolerance of L. chinensis. A pot experiment was conducted with L. chinensis as the host plant, C. virgata as the companion species, and AM fungal communities derived from the rhizosphere of L. chinensis from Songnen saline-alkali grassland as the inoculant. The experiment therefore had three variables: AM fungi, a companion plant, and alkali stress. The mycorrhizal infection rate, growth index, leaf chlorophyll content, malondialdehyde (MDA) content, antioxidant enzyme activity, and osmoregulatory substance content of L. chinensis were measured to analyze the effects of the companion plant and AM fungal inoculation on the physiology and growth of L. chinensis under alkali stress. The main results were as follows: 1) The AM fungi effectively colonized the roots of L. chinensis under alkali stress, and C. virgata inhibited this symbiosis. 2) Compared with uninoculated L. chinensis, plants of L. chinensis inoculated with AM fungi showed a significantly reduced MDA content, and increased biomass, chlorophyll content, antioxidant enzyme activities, and osmoregulatory substance contents, which resulted in enhanced alkali tolerance. 3) The biomass of L. chinensis was lower in the control than in the treatment groups. Compared with L. chinensis in the control group, L. chinensis in the alkali treatment group showed higher contents of osmoregulatory substances, increased enzyme activities, and improved growth. 4) The interaction between C. virgata and AM fungi was associated with increased leaf width, saturation fresh weight, chlorophyll content, soluble sugar content, and soluble protein content, and enhanced activities of peroxidase and catalasein L. chinensis. 5) A membership function analysis showed that AM fungi can interact with C. virgata and improve the tolerance of L. chinensis in alkali habits. These results provide a theoretical basis for evaluating the effects of AM fungi and C. virgata as a companion plant on the growth of L. chinensis under alkali stress. These findings also provide important data to assist development of methodologies for the ecological restoration of Songnen saline-alkali grassland by introduction of appropriate companion plants and exploitation of mycorrhizal symbioses.

Key words: Leymus chinensis, Chloris virgata, arbuscular mycorrhizal fungi, alkali stress