Abstract: Alhagi sparsifolia and Tamarix ramosissima were respectively used as the donor and the receiver plants to explore the effects of different arbuscular mycorrhizal fungi (AMF) hyphal transmission distance treatments on their seedlings under salt stress. The pot experiment was conducted to determine the AMF infection rate,plant height basal diameter,chlorophyll fluorescence parameters,antioxidant enzyme activity,and osmoregulation substance content of the donor and the receiver plants under different salt concentrations (0,0.4%,and 0.8%) and arbuscular hyphal transmission distances (15 cm and 30 cm). The results showed that in the receiver plants,AMF had a significant promoting effect on Fo,Fm,Fv/Fm values,MDA and osmoregulation substance content,and antioxidant enzyme activity in L1 and L2 treatments at the S1 level,and there was no significant difference between receptors at different distances. However,AMF did not promote the growth and physiological indicators of seedlings under L2 treatment at the S2 level. In summary,AMF could alleviate the damage of salt stress to the receiver plants by significantly improving chlorophyll fluorescence parameters,antioxidant capacity,and osmoregulation material content over long distances under low salt stress;However,under high salt stress,long distances were not conducive to mycorrhizal colonization and plant growth,leading to the inability of AMF to promote the receiver plants.

Key words: Salt stress, AMF, Alhagi sparsifolia, Tamarix ramosissima, Physiological characteristics

摘要： 本试验以疏叶骆驼刺(Alhagi sparsifolia)和多枝柽柳(Tamarix ramosissima)分别为供、受体植物,探讨在盐胁迫下不同丛枝菌根真菌(Arbuscular mycorrhizal fungi,AMF)菌丝传递距离处理对其幼苗的影响。研究通过盆栽试验,对不同盐浓度(0,0.4%和0.8%)及丛菌丝传递距离(15 cm和30 cm)处理下供、受体植物的AMF侵染率、株高基径、叶绿素荧光参数、抗氧化酶活性和渗透调节物质含量进行测定。结果表明:在受体植物中,AMF对S1水平下L1和L2处理的Fo,Fm和Fv/Fm值、MDA和渗透调节物质含量及抗氧化酶活性均具有明显的促进作用,且不同距离受体间差异不显著,但对S2水平L2处理下幼苗的生长和生理指标无促进作用。综上所述,AMF在低盐胁迫长距离下能通过显著提高叶绿素荧光参数、抗氧化和渗透调节能力缓解盐胁迫对受体植物的伤害;但高盐胁迫下,长距离不利于菌根定殖和植物生长,导致AMF无法对受体植物产生促进作用。

关键词: 盐胁迫, 丛枝菌根网络, 疏叶骆驼刺, 多枝柽柳, 生理特性