Effects of arbuscular mycorrhizal inoculation on osmoregulation and antioxidant responses of blueberry plants

2019 ◽  
Vol 48 (3) ◽  
pp. 641-647 ◽  
Author(s):  
Jia-Le Tu ◽  
Xiao-Min Liu ◽  
Jia-Xin Xiao
Keyword(s):  
Low Temperature ◽  
Temperature Stress ◽  
Soluble Sugar ◽  
Arbuscular Mycorrhizal ◽  
Am Fungi ◽  
Low Temperature Stress ◽  
Vaccinium Ashei ◽  
Antioxidant Responses ◽  
Antioxidant Content ◽  
Mycorrhizal Inoculation

Effects of the arbuscular mycorrhizal (AM) fungi, Glomus mosseae, G. intraradices, and G. etunicatum, on plant growth, antioxidant content, osmoregulation, and nutrition were investigated in ‘Premier’ blueberry (Vaccinium ashei) plants exposed to low-temperature stress. Low temperature decreased mycorrhizal colonization, growth, levels of leaf soluble sugar, ascorbic acid (ASA) and root viability. However, at low temperatures, levels of leaf superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT) were found to increase, accompanied by increases in levels of ASA, malondialdehyde (MDA), and proline. G. mosseae especially, significantly increased levels of SOD, POD, CAT and ASA, but decreased levels of MDA in plants. AM-inoculated plants had higher contents of proline, soluble sugar, phosphorus, potassium, calcium and magnesium than non-AM-inoculated plants, especially in the G. mosseae-inoculated plants. These results indicate that G. mosseae has the potential to enhance resistance of ‘Premier’ blueberry plants against low-temperature stress through improving antioxidant content, osmotic adjustment and mineral nutrition.

Arbuscular mycorrhizal fungi alleviate low-temperature stress and increase freezing resistance as a substitute for acclimation treatment in barley

2019 ◽  
Vol 70 (3) ◽  
pp. 218 ◽  
Author(s):  
Roghieh Hajiboland ◽  
Arshad Joudmand ◽  
Nasser Aliasgharzad ◽  
Roser Tolrá ◽  
Charlotte Poschenrieder
Keyword(s):  
Survival Rate ◽  
Low Temperature ◽  
Arbuscular Mycorrhizal Fungi ◽  
Temperature Stress ◽  
Mycorrhizal Fungi ◽  
Membrane Integrity ◽  
Arbuscular Mycorrhizal ◽  
Climatic Conditions ◽  
Low Temperature Stress ◽  
Acclimation Treatment

Barley (Hordeum vulgare L.) is cultivated globally under a wide range of climatic conditions and is subjected to chilling and freezing stresses under temperate and cold climatic conditions. As a mycorrhizal crop, barley may benefit from this association for increasing cold resistance. In order to investigate the effects of inoculation with arbuscular mycorrhizal fungi (AMF) on cold-stress resistance in barley plants, one winter and one spring cultivar were grown under control (25°C day, 17°C night) and low, non-freezing (LT: 5°C day, 3°C night) temperatures for 3 weeks in the absence (−AMF) or presence (+AMF) of two species of AMF, Glomus versiforme and Rhizophagus irregularis. In addition, the influence of LT (as an acclimation treatment) was studied on plant survival after a 2-day exposure to freezing temperature (FT: −5°C in dark). Biomass production, membrane integrity and survival rate of plants indicated that the winter cultivar was more tolerant than the spring cultivar. Inoculation with AMF resulted in improved growth, photosynthesis, osmotic and water homeostasis, and potassium uptake under both control and LT conditions, whereas the effect on membrane integrity, antioxidative defence and phenolics metabolism was mainly observed in LT plants. AMF inoculation substituted partially or completely for acclimation treatment and increased the survival rate of FT plants, with the highest survival achieved in a combination of AMF and LT. Mycorrhizal responsiveness was higher in LT plants. Despite the lower AMF colonisation, G. versiforme was often more effective than R. irregularis for the alleviation of low temperature stress in both cultivars, whereas R. irregularis was more effective in increasing the survival rate. Our data suggest that the right combination of fungus species and host-plant cultivar is important for successful utilisation of AMF under cold conditions.

Carbon and nitrogen metabolism in arbuscular mycorrhizal maize plants under low-temperature stress

2015 ◽  
Vol 66 (1) ◽  
pp. 62 ◽  
Author(s):  
Xian-Can Zhu ◽  
Feng-Bin Song ◽  
Fu-Lai Liu ◽  
Sheng-Qun Liu ◽  
Chun-Jie Tian
Keyword(s):  
Low Temperature ◽  
Temperature Stress ◽  
Soluble Sugars ◽  
Arbuscular Mycorrhizal ◽  
Sucrose Phosphate Synthase ◽  
Low Temperature Stress ◽  
Total N ◽  
Am Fungus ◽  
N Metabolism ◽  
Maize Plants

Effects of the arbuscular mycorrhizal (AM) fungus Glomus tortuosum on carbon (C) and nitrogen (N) metabolism of Zea mays L. grown under low-temperature stress was investigated. Maize plants inoculated or not inoculated with AM fungus were grown in a growth chamber at 25°C for 4 weeks and subsequently subjected to two temperature treatments (15°C, low temperature; 25°C, ambient control) for 2 weeks. Low-temperature stress significantly decreased AM colonisation, plant height and biomass. Total N content and activities of glutamate oxaloacetate transaminase and glutamate pyruvate transaminase of AM plants were higher than those of non-AM plants. AM plants had a higher net photosynthetic rate (Pn) than non-AM plants, although low temperature inhibited the Pn. Compared with non-AM plants, AM plants exhibited higher leaf soluble sugars, reducing sugars, root sucrose and fructose contents, and sucrose phosphate synthase and amylase activities at low temperature. Moreover, low-temperature stress increased the C : N ratio in the leaves of maize plants, and AM colonisation decreased the root C : N ratio. These results suggested a difference in the C and N metabolism of maize plants at ambient and low temperature regimes. AM symbiosis modulated C metabolic enzymes, thereby inducing an accumulation of soluble sugars, which may have contributed to an increased tolerance to low temperature, and therefore higher Pn in maize plants.

Sign in / Sign up

Export Citation Format

Share Document