Impact of an arbuscular mycorrhizal fungal inoculum and exogenous methyl jasmonate on the performance of tall fescue under saline-alkali condition

Abstract

Hormonal regulation and symbiotic relationships provide benefits for plants to overcome stress conditions. The aim of this study was to elucidate the effects of arbuscular mycorrhizal fungal (AMF) inoculum, methyl jasmonate (MeJA), and saline-alkali effects on the growth and physiology of tall fescue (Festuca elata “Crossfire II”). Treatments included AMF-inoculation, and non-AMF inoculation, four MeJA application concentrations (0, 50, 100, and 200 mg/L), and two saline-alkali levels (0 and 200 mmol/L). The results showed that AMF inoculation significantly enhanced saline-alkali resistance of the plants, and the beneficial effects were increased by MeJA at a concentration of 50 mg/L (50 MeJA) and decreased by MeJA at a concentration both of 100 (100 MeJA) and 200 mg/L (200 MeJA). AMF inoculation plants when treated with 50 MeJA accumulated significantly more biomass, had greater proline and total phenolic concentration, and lower malondialdehyde (MDA) concentration than plants only treated either with AMF or 50 MeJA. However, no significant differences in growth or physiological characteristics were observed between AMF and non-AMF plants when treated either with 100 or 200 MeJA. All of these results suggest that the interaction between a certain concentration of MeJA and AMF can significantly increase saline-alkali resistance of the tall fescue by regulating the biomass, proline, total phenolic, and MDA. Our findings provide new information on the effect of biological and chemical priming treatments on plant performance under saline-alkali stress.

Improvement of Panax notoginseng saponin accumulation triggered by methyl jasmonate under arbuscular mycorrhizal fungi

“…The addition of exogenous MeJA/JA greatly interferes with the biosynthesis and metabolism of MeJA/JA in plants, and it is generally believed that low concentrations of exogenous MeJA/JA have promoting effect, while high concentrations have inhibitory effect ( Regvar et al., 1996 ; Ludwig-Müller et al., 2002 ; Formenti and Rasmann, 2019 ; Liu et al., 2022 ). The concentrations of JA, MeJA, JA-Ile and OPDA in our study increased significantly under the addition of MeJA ( Figure 3 ).…”

SlWRKY81 regulates Spd synthesis and Na+/K+ homeostasis through interaction with SlJAZ1 mediated JA pathway to improve tomato saline‐alkali resistance

“…To illustrate, Arabidopsis thaliana (Prerostova et al., 2017), Zea mays L. (Zhang et al., 2017), and Dioscorea esculenta (Shahzad et al., 2015) demonstrate remarkable increases in endogenous JA content to enhance salt resistance. In tall fescue, the exogenous application of MeJA enhances proline and total phenolic concentrations, improving resistance to saline‐alkali stress (Liu et al., 2022). SCF COI1 JA–Ile–jasmonate–ZIM domain (JAZ) proteins, which act as suppressors in the JA signaling pathway, play a critical role in plant stress responses.…”