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Acta Horticulturae Sinica ›› 2025, Vol. 52 ›› Issue (9): 2410-2424.doi: 10.16420/j.issn.0513-353x.2024-0858

• Cultivation·Physiology & Biochemistry • Previous Articles     Next Articles

Effect of Arbuscular Mycorrhizal Fungi on the Growth and Mechanism of Different Apple Cultivar Under Salt-Alkali Stress

DU Lijun, LIU Yingcai, SHI Yanyan, WANG Yang, LI Chunhui, HE Yintao, WANG Xu, BIAN Chuanjie, ZHANG Manrang*()   

  1. College of HorticultureNorthwest A & F University,Yangling, Shaanxi 712100, China
  • Received:2025-01-24 Revised:2025-03-15 Online:2025-09-25 Published:2025-09-24
  • Contact: ZHANG Manrang

Abstract:

To investigate the effects and mechanisms of the arbuscular mycorrhizal fungi(AMF)on the growth of apple grafted under salt-alkali stress,‘Qincui’and‘Ruixue’as experimental materials was grafted on M26. The experiment included four treatment groups:the control(CK,Irrigated with water),the salinity-alkality(0.2 mol · L-1 NaHCO3NaCl = 11,SA),inoculation with AMF(Inoculated with Glomus intraradices,AMF),and SA + AMF(inoculation with AMF 60 d in advance,followed by watering with SA). SA treatment significantly reduced plant height,stem diameter,shoot growth,root area,root length,root volume,chlorophyll content,and photosynthetic rate in‘Qincui’ and‘Ruixue’apple seedlings,however,AMF inoculation alleviated the growth inhibition caused by salt-alkali stress. Compared with SA treatment,the SA + AMF treatment significantly enhanced the activities of antioxidant enzymes(POD,SOD,and CAT)in‘Qincui’and‘Ruixue’. In‘Qincui’leaves,POD,SOD,and CAT activities increased by 28.27%,48.72%,and 37.01%,respectively,while in‘Ruixue’,these activities increased by 12.75%,23.37%,and 16.10%,and MDA content in leaves and roots significantly decreased. Compared with SA treatment,the SA + AMF treatment significantly enhanced TTC reduction intensity of‘Qincui’and‘Ruixue’increased by 71.40% and 34.29%,the root citrate content increased by 105.26% and 122.22%,respectively. AMF facilitated citrate secretion,thereby reducing root pH and enhancing the salt-alkali tolerance of‘Qincui’and‘Ruixue’. Under salt-alkali stress,AMF symbiosis decreased Na+ content in the leaves,while K+ content in both roots and leaves increased,leading to a significant reduction in the Na+/K+ ratio. Notably,the Na+/K+ ratio in the roots of‘Qincui’returned to control levels. These findings indicate that AMF inoculation promotes seedling vigor,root activity,chlorophyll content,and photosynthetic rate. Inaddition,AMF regulates the Na+/K+ ratio to maintain ion homeostasis,thereby mitigating ion toxicity caused by salt-alkali stress. Moreover,AMF enhanced the activities of antioxidant enzymes(SOD,POD and CAT),thereby reducing reactive oxygen species(ROS)accumulation and oxidative damage. Under salt-alkali stress,AMF also increases citrate secretion,which maintain balance of root pH and alleviates pH stress,further mitigating the growth inhibition caused by salt-alkali conditions.

Key words: apple, arbuscular mycorrhizal fungi, saline-alkalini stress, ion homeostasis, oxidative damage