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Acta Prataculturae Sinica ›› 2023, Vol. 32 ›› Issue (3): 179-188.DOI: 10.11686/cyxb2022101

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Effect of arbuscular mycorrhizal fungi on the salt tolerance of Trifolium repens

Yan-lan ZHAO(), Xin-yi ZENG, Jin-chao GONG, Xiang-jun LI, Xu-xu LI, Shan LIU, Xin-quan ZHANG, Ji-qiong ZHOU()   

  1. College of Grassland Science and Technology,Sichuan Agricultural University,Chengdu 611130,China
  • Received:2022-03-01 Revised:2022-04-22 Online:2023-03-20 Published:2022-12-30
  • Contact: Ji-qiong ZHOU

Abstract:

Arbuscular mycorrhizal fungi (AMF) enter into symbiotic relationships with plants by forming mycorrhizal networks, and thus play critical roles in plant growth and resilience to environmental stresses. At present, it is still debated whether AMF affect the salt tolerance of clover (Trifolium repens). In this study, we explored the effect of AMF on T. repens plants under salt-stress conditions (NaCl at 150 mmol·L-1). It was found that, compared with a no-salt control, salt stress inhibited the growth and physiological indexes of T. repens. Under salt stress conditions, compared with uninoculated plants, those inoculated with AMF showed significantly increased plant height, dry weight, maximal photochemical efficiency of photosystem II, and relative water content, decreased malondialdehyde content and relative electric conductivity, and higher contents of soluble sugars and free proline (32.03% and 9.42% higher, respectively). Our results demonstrate that salt stress inhibits the growth of T. repens, and that AMF improve the salt stress tolerance of T. repens by enhancing stress resistance and decreasing the malondialdehyde content and ion leakage (relative conductivity) under salt stress.

Key words: salt stress, arbuscular mycorrhizal fungi, Trifolium repens