Publications by authors named "Velazhahan Rethinasamy"

Article Synopsis
  • The text discusses a diverse family of macrofungi, primarily wood-decaying fungi, containing about 89 species across various climates and some that act as pathogens for forest trees.
  • Phylogenetic analysis using genomic data revealed two major clades of genera within this family, with additional insights about their evolutionary timeline, indicating significant diversification events in the Early Cretaceous and Eocene epochs.
  • The study also introduces a new species identified in Oman, detailing its morphological characteristics and genetic relationships, alongside an identification key and discussions on the ecology and distribution of the family’s species.
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Senna, a medicinal herb, is highly susceptible to aflatoxin contamination, which often limits the export value of the final products due to the regulatory limits of importing countries. Presence of aflatoxin B1 (AFB) was investigated in 229 senna pod samples at various stages from field to storage over three years. Higher incidence of AFB was revealed during the late harvest stage with a mean level of 52.

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In this study, bacteria residing in the gut of the rice weevils ( L.) (Coleoptera: Curculionidae) feeding on aflatoxin-contaminated corn kernels were isolated and evaluated for their ability to suppress and to remove/degrade aflatoxin B1 (AFB1). Four morphologically distinct gut-associated bacterial isolates were isolated and identified as (RWGB1), (RWGB2), (RWGB3), and (RWGB4) based on 16S rRNA gene sequence analysis.

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has small to medium-sized mushrooms and the cap surface with squamulose pellicles, consisting of hymeniform or pseudoparenchymatous cells and yellowish-brown basidiospores. The species of are very similar to those of and it is extremely difficult to differentiate the species of both genera in the field. However, phylogenetically, both the genera are clearly distinct.

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-induced damping-off of cucumber is a major constraint to cucumber production in different parts of the world. Although chemical fungicides are used for managing this disease, they have many drawbacks to the environment. The ability of the antagonistic fungi isolated from the rhizosphere and endosphere of and in the control of soilborne pathogen was inspected.

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This study was conducted to investigate the antagonistic potential of endophytic and rhizospheric bacterial isolates obtained from in suppressing and and promoting the growth of cucumber. Molecular identification of bacterial strains associated with confirmed that these strains belong to the , , , , , , , , , and genera. A dual culture assay showed that nine of the bacterial strains exhibited antifungal activity, four of which were effective against both pathogens.

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The dubas bug () (Hemiptera: Tropiduchidae) is a serious pest in date palms in several date-producing countries, including Oman. Infestation results in a severe reduction in yield and a weakening of date palm growth. In addition, egg laying, which causes injuries to date palm leaves, results in the development of necrotic lesions on the leaves.

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In this study, endophytic and rhizospheric bacteria were isolated from and from Oman, and their in vitro antagonistic activity against was tested using a dual culture assay. The promising strains were tested further for their compatibility and potential for plant growth promotion, biofilm formation, antifungal volatile organic compound (VOC) production, and the biological control of damping-off of cabbage ( L.) under greenhouse conditions.

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Article Synopsis
  • The study focused on using soil-associated yeasts from India's Western and Eastern Ghats to combat the growth of Aspergillus flavus, a fungus responsible for aflatoxin contamination in food.
  • A total of 45 yeast isolates were tested, with 12 showing effective inhibition of A. flavus; these included species like Saccharomyces cerevisiae and Pichia kudriavzevii.
  • The selected yeast strains, particularly S. cerevisiae, demonstrated significant suppression of A. flavus growth and aflatoxin B production, with identified volatile compounds showing antimicrobial properties that could serve as potential biocontrol agents.
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is a saprotrophic mushroom genus with small-sized basidiomata in the family Agaricaceae (Agaricales). Prior to this study, 26 species belonging to this genus have been described and published. In this study, we reported for the first time from Oman with the description of two new species.

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Fig ( L.) is widely grown in Oman mainly for its nutritional value and health benefits. In May 2020, survey was conducted for fig trees which were showing symptoms of decline in three farms where more than 1500 fig trees were grown.

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Endophytic fungi viz., (E1 and E6) (E7), and (E8 and E10) were isolated from the medicinal plant, Shirazi thyme (). In tests, these endophytes inhibited the mycelial growth of , a plant pathogenic fungus.

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This study was conducted to investigate the antagonistic activity of endophytic and rhizosphere fungi isolated from a medicinal plant, , against , the cause of damping off of cucumber. A total of 40 endophytic and 19 rhizosphere fungi were isolated from . Three endophytic isolates and two rhizosphere isolates gave >50% suppression of in the in vitro dual-culture tests.

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A study was conducted to investigate the potential of obtained from mangrove roots in inhibiting and damping-off disease of cucumber. exhibited in vitro inhibition of growth. Electron microscope examination revealed that the antagonistic fungal isolate resulted in shrinking and groves in hypha.

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This study examined fungal diversity and composition in conventional (CM) and desert farming (DE) systems in Oman. Fungal diversity in the rhizosphere of tomato was assessed using 454-pyrosequencing and culture-based techniques. Both techniques produced variable results in terms of fungal diversity, with 25% of the fungal classes shared between the two techniques.

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Background: Aflatoxin contamination of various foodstuffs and agricultural commodities is a major problem worldwide. Several strategies have been reported for the detoxification of aflatoxins in contaminated foods and feeds, but all these methods have their own shortcomings. Traditional medicinal plants are potential sources of aflatoxin-detoxifying compounds.

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Thaumatin-like proteins (TLPs) were shown to be induced in rice plants (cv. IR58) that were infected with the sheath blight fungus, Rhizoctonia solani. Western blot analysis revealed the presence of two TLPs with sizes of 25 and 24 kDa which are different from a previously reported TLP with a size of 15.

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