scholarly journals Enzymatic Evidence for the Key Role of Arginine in Nitrogen Translocation by Arbuscular Mycorrhizal Fungi

2006 ◽  
Vol 144 (2) ◽  
pp. 782-792 ◽  
Author(s):  
Cristina Cruz ◽  
Helge Egsgaard ◽  
Carmen Trujillo ◽  
Per Ambus ◽  
Natalia Requena ◽  
...  
Keyword(s):  
Arbuscular Mycorrhizal Fungi ◽  
Mycorrhizal Fungi ◽  
Arbuscular Mycorrhizal ◽  
Nitrogen Translocation

scholarly journals Induction of Osmoregulation and Modulation of Salt Stress inAcacia gerrardiiBenth. by Arbuscular Mycorrhizal Fungi andBacillus subtilis(BERA 71)

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Abeer Hashem ◽  
E. F. Abd_Allah ◽  
A. A. Alqarawi ◽  
A. A. Al-Huqail ◽  
M. A. Shah
Keyword(s):  
Salt Stress ◽  
Arbuscular Mycorrhizal Fungi ◽  
Glycine Betaine ◽  
Mycorrhizal Fungi ◽  
Plant Stress ◽  
Arbuscular Mycorrhizal ◽  
Systemic Resistance ◽  
Plant Growth Promoting ◽  
Acacia Gerrardii

The role of soil microbiota in plant stress management, though speculated a lot, is still far from being completely understood. We conducted a greenhouse experiment to examine synergistic impact of plant growth promoting rhizobacterium,Bacillus subtilis(BERA 71), and arbuscular mycorrhizal fungi (AMF) (Claroideoglomus etunicatum;Rhizophagus intraradices; andFunneliformis mosseae) to induce acquired systemic resistance in Talh tree (Acacia gerrardiiBenth.) against adverse impact of salt stress. Compared to the control, the BERA 71 treatment significantly enhanced root colonization intensity by AMF, in both presence and absence of salt. We also found positive synergistic interaction betweenB.subtilisand AMFvis-a-visimprovement in the nutritional value in terms of increase in total lipids, phenols, and fiber content. The AMF and BERA 71 inoculated plants showed increased content of osmoprotectants such as glycine, betaine, and proline, though lipid peroxidation was reduced probably as a mechanism of salt tolerance. Furthermore, the application of bioinoculants to Talh tree turned out to be potentially beneficial in ameliorating the deleterious impact of salinity on plant metabolism, probably by modulating the osmoregulatory system (glycine betaine, proline, and phenols) and antioxidant enzymes system (SOD, CAT, POD, GR, APX, DHAR, MDAHR, and GSNOR).

scholarly journals Role of Melatonin in Arbuscular Mycorrhizal Fungi-Induced Resistance to Fusarium Wilt in Cucumber

2020 ◽  
Vol 110 (5) ◽  
pp. 999-1009 ◽  
Author(s):  
Golam Jalal Ahammed ◽  
Qi Mao ◽  
Yaru Yan ◽  
Meijuan Wu ◽  
Yaqi Wang ◽  
...  
Keyword(s):  
Arbuscular Mycorrhizal Fungi ◽  
Fusarium Wilt ◽  
Mycorrhizal Fungi ◽  
Electrolyte Leakage ◽  
Leaf Gas Exchange ◽  
Combined Treatment ◽  
Arbuscular Mycorrhizal ◽  
Control Effect ◽  
Amf Inoculation

Melatonin is a multifunctional molecule that confers tolerance to a number of biotic and abiotic stresses in plants. However, the role of melatonin in plant response to Fusarium oxysporum and the interaction with arbuscular mycorrhizal fungi (AMF) remain unclear. Here we show that exogenous melatonin application promoted the AMF colonization rate in cucumber roots, which potentially suppressed Fusarium wilt as evidenced by a decreased disease index and an increased control effect. Leaf gas exchange analysis revealed that Fusarium inoculation significantly decreased the net photosynthetic rate (Pn), stomatal conductance (Gs), intercellular CO2 concentrations (Ci), and transpiration rate (Tr). Intriguingly, either melatonin application or AMF inoculation significantly increased the Pn, Gs, Tr, and dry biomass, and their combined treatment showed a more profound effect under Fusarium stress. Further analysis showed that Fusarium induced oxidative stress as evidenced by increased lipid peroxidation and electrolyte leakage. Conversely, either melatonin or AMF drastically attenuated the levels of malondialdehyde, H2O2, and electrolyte leakage in Fusarium-inoculated plants, and their combined treatment caused a further decrease. Fusarium inoculation decreased the activity and transcripts of superoxide dismutase and ascorbate peroxidase, and the content of glutathione and proline. Besides, the activity and transcripts of peroxidase and catalase, the content of phenols and flavonoids increased after Fusarium infection. Importantly, melatonin and/or AMF significantly increased those parameters with the greatest effect with their combined treatment under Fusarium stress. Our results suggest that a positive collaboration between melatonin and AMF enhances resistance to Fusarium wilt in cucumber plants.

The role of inoculum identity in drought stress mitigation by arbuscular mycorrhizal fungi in soybean

2014 ◽  
Vol 51 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Betiana C. Grümberg ◽  
Carlos Urcelay ◽  
María A. Shroeder ◽  
Silvina Vargas-Gil ◽  
Celina M. Luna
Keyword(s):  
Drought Stress ◽  
Arbuscular Mycorrhizal Fungi ◽  
Mycorrhizal Fungi ◽  
Arbuscular Mycorrhizal
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