Authors:G. Zadehdabagh, K. Karimi, M. Rezabaigi and F. Ajamgard
The northern of Khuzestan province in Iran is mainly considered as one of the major areas of miniature rose production. Blossom blight caused by Botrytis cinerea has recently become a serious limiting factor in rose production in pre and post-harvest. In current study, an attempt was made to evaluate the inhibitory potential of some local Trichoderma spp. strains against B. cinerea under in vitro and in vivo conditions. The in vitro results showed that all Trichoderma spp. strains were significantly able to reduce the mycelial growth of the pathogen in dual culture, volatile and non-volatile compounds tests compared with control, with superiority of T. atroviride Tsafi than others. Under in vivo condition, the selected strain of T. atroviride Tsafi had much better performance than T. harzianum IRAN 523C in reduction of disease severity compared with the untreated control. Overall, the findings of this study showed that the application of Trichoderma-based biocontrol agents such as T. atroviride Tsafi can be effective to protect cut rose flowers against blossom blight.
Authors:K. Karimi, A. Narmani, I. Pertot and M. Arzanlou
Proteases constitute a significant part of cell wall-degrading enzymes (CWDEs)
produced by fungal biocontrol agents and particularly crucial in mycoparasitism
of fungal phytopathogens. Plate-based screening methods are routinely used for
screening protease-producing microorganisms including fungi. Skim milk agar
(SMA) is one of the most popular media for the detection of protease producing
bacteria. However, SMA is not efficient to test fast growing fungi, because it
does not give an estimation of the actual amount of secreted protease produced
by fungal inocula. In the current study, the efficacy of two modified
plate-screening methods, including split-SMA (SSMA) and minimal medium
supplemented with skim milk (MSMW) was assessed for detection of protease
production by three representative fungal strains including Trichoderma
longibrachiatum strain N, Beauveria bassiana
strain B and Purpureocillium lilacinum strain PL. Protease
production was revealed on the three tested media by the three strains. However,
the halo diameter of the fungal strains (a proxy for protease production) was
the smallest on SMA. Furthermore, protease production could not be detected for
T. longibrachiatum strain N on SMA due to its fast growth;
while it showed the highest protease activity on both modified media compared
with the other strains. According to the result of this study, the SSMA medium
is an easy and more accurate method compared with the two other different
methods as it displays the actual amount of protease produced by fungal strains
and therefore this method is recommended for quantitative and qualitative
detection of protease production by slow and fast growing fungi.
Authors:K. Kalantar, Z. Farzaneh, M. Eshkevar Vakili, M.H. Karimi, M. Asadi, S. Khosropanah and M. Doroudchi
Atherosclerosis is an inflammatory disease causing a vast array of cardiovascular diseases. Adipophilin has been reported to be highly expressed in atherosclerotic lesions. This study investigated the possible existence of auto-reactive T cells against an HLA-A02-restricted adipophilin-derived peptide as well as peptides from Epstein-barr virus (EBV), Cytomegalovirus (CMV) and influenza (Flu) virus in patients with atherosclerosis.
HLA-A02 expression on peripheral blood mononuclear cells (PBMCs) was examined by flow cytometry. PBMCs from HLA-A02 individuals were stimulated with adipophilin, CMV, EBV, and Flu peptides at a concentration of 10 µM. Interferon (IFN)-γ production was evaluated in the culture supernatant using a commercial ELISA test.
The levels of IFN-γ production against an HLA-A02-restricted adipophilin peptide and peptides from CMV, EBV, and Flu revealed no statistically significant differences between patients and healthy controls. However, we found a positive correlation between IFN-γ production against adipophilin and Body mass index (BMI) of patients (R = 0.8, P = 0.003), whereas no significant correlation was found in healthy controls (R = −0.267, P = 0.378). No correlation between BMI and IFN-γ production against CMV, EBV, or Flu peptides was found.
Atherosclerotic patients with higher BMIs might have greater numbers of T cells against adipophilin that is highly expressed in atherosclerotic plaques. Therefore, autoimmune reactions may have a greater role in the development of atherosclerosis in individuals with higher BMI.