Biological parameters and host preference of Tyrophagus putrescentiae (Schrank) on different Pleurotus ostreatus cultivars

Tyrophagus putrescentiae (Acari: Acaridae) is a destructive pest of edible fungi. Different species of edible fungi have variable effects on the growth, development and fecundity of T. putrescentiae, but it is unclear whether these effects exist in the same species. We used nine cultivars of the oyster mushroom (Pleurotus ostreatus) to evaluate the development and reproduction parameters of T. putrescentiae at 26 ± 1°C and 80 ± 5% humidity. Different P. ostreatus cultivars had significant effects on the immature stages, female fertility, and reproductive lifespan. Total egg-to-adult development time ranged from 10.0 ± 1.2 d (on Po389 cultivar) to 12.5 ± 1.0 d (on Po62 cultivar). Mite mortality ranged from 54.3 ± 4.2% (on Po86 cultivar) to 100.0 ± 0.0% (on Po62 cultivar). The number of eggs laid per female ranged from 3.2 ± 0.4 (on Po45 cultivar) to 9.1 ± 1.1 (on Po86 cultivar). The average lifespan of females ranged from 3.0 ± 0.5 d (on Po45 cultivar) to 16.3 ± 1.7 d (on Po86 cultivar). Host preference of the mite was significantly different among the nine cultivars with a preference for cultivars Po65, Po80, Po389, and Po86. These results indicate that P. ostreatus cultivars significantly affect the biology of T. putrescentiae and the relationship between mite damage and mushroom yield.

Constituents from the Fruiting Bodies of Trametes cubensis and Trametes suaveolens in Vietnam and Their Anti-Inflammatory Bioactivity

It is reported that various fungi have been used for medicine and edible foods. The tropical Trametes genus is popular and well-known in Vietnam for its health effects and bioactivities. In this study, the fruiting bodies of the edible fungi T. cubensis and T. suaveolens were collected in Vietnam. The preliminary bioactivity screening data indicated that the methanol extracts of the fruiting bodies of T. cubensis and T. suaveolens displayed significant inhibition of superoxide anion generation and elastase release in human neutrophils. Therefore, the isolation and characterization were performed on these two species by a combination of chromatographic methods and spectrometric analysis. In total, twenty-four compounds were identified, and among these (1–3) were characterized by 1D-, 2D-NMR, and HRMS analytical data. In addition, the anti-inflammatory potentials of some purified compounds were examined by the cellular model for the inhibition of superoxide anion generation and elastase release in human neutrophils. Among the isolated compounds, (5,14), and (19) displayed significant anti-inflammatory potential. As the results suggest, the extracts and isolated compounds from T. cubensis and T. suaveolens are potential candidates for the further development of new anti-inflammatory lead drugs or natural healthy foods.

Morphological and Molecular Identification of Oyster Mushroom [Pleurotus Ostreatus (Jacq.) P. Kumm]

Oyster mushroom (Pleurotus ostreatus) is fleshy, edible fungi and used throughout the world. Among the most well-known species of mushrooms, Pleurotus sp. is the third most popularly grown mushroom in the world and rank second in India. The most well-known species of Pleurotus are P. ostreatus, P. florida, P. eryngii, P. cystidiosis, P. flabellatus, P. cornucopie, and P. sajor-caju. According to the morphological, molecular character and ITS sequencing, the Pleurotus ostreatus was distinguish from the other species. The cap (pileus) of the oyster mushroom has whitish to grey color and fleshy. Stipe cream and smooth surface. Spores are whitish to lilac grey in mass, cylindrical to oblong shape. Spore print was white in color. Whitish mycelium growth in PDA plate. The ITS sequence was submitted to gene bank NCBI and it was accepted by NCBI with accession number MW446165.

First report that Mucor irregularis causes white mold disease on substrates used for wine-cap mushroom (Stropharia rugosoannulata) cultivation in China

Stropharia rugosoannulata, a world-wide popular mushroom, is one of the edible fungi recommended by the Food and Agriculture Organization of the United Nations (FAO) to developing countries (Hawksworth et al., 1996). In China, the cultivation scale of S. rugosoannulata exceeded 40 km2 in 2020 according to the incomplete statistics from emushroom network (http://www.emushroom.net/news/202104/06/33499.html). In October 2020, white mold disease was found on substrates of S. rugosoannulata in a heliogreenhouse in Huai’an city, Jiangsu province, China (Figure 1). The cultivation materials of S. rugosoannulata included rice straw (30%), wheat straw (30%), saw dust (30%), and a small amount of wheat bran (5%) and rice bran (5%). After mixing them together, the mycelial strain of S. rugosoannulata was seeded into the mixture, and then covered by casing soil for further cultivation. In the heliogreenhouse, the average air temperature and relative air humidity were 18 ± 4℃ and 73 ± 3%, respectively. In the diseased substrates, a large amount of thick white fungal mycelia were observed with yellow ooze on the surface, which prevented the growth of the mycelia and fruiting bodies of S. rugosoannulata (Figure 2). However in the fruiting period, no disease symptoms were found on mature fruiting bodies of S. rugosoannulata. The white mold disease incidence was calculated as ~ 30% by dividing the total infected area of substrates with the total area of the substrates examined. This white mold disease resulted in serious economic losses due to reduced production.

Planifilum fulgidum Is the Dominant Functional Microorganism in Compost Containing Spent Mushroom Substrate

The extensive accumulation of spent mushroom substrate (SMS) owing to the large-scale production of edible fungi is causing environmental problems that cannot be ignored. Co-composting is a promising method for agricultural and animal husbandry waste disposal. In this study, the composition and function of microbial communities in the process of cattle manure–maize straw composting with SMS addition were compared through an integrated meta-omics approach. The results showed that irrespective of SMS addition, the predominant fungi were Ascomycota, while the dominant bacteria were Firmicutes, Proteobacteria, Actinobacteria, and Bacteroidetes. High temperature promoted the evolution from Gram-negative bacteria (Bacteroides, Proteobacteria) to Gram-positive bacteria (Firmicutes, Actinomycetes). The composting process was accelerated by SMS addition, and the substrate was effectively degraded in 14 days. Metaproteomics results showed that the dominant microorganism, Planifilum fulgidum, secreted large amounts of S8, M17, and M32 proteases that could degrade macromolecular protein substrates in the presence of SMS. Planifilum fulgidum, along with Thermobifida fusca and Melanocarpus albomyces, synergistically degraded hemicellulose, cellulose, and protein. In addition, the dominant microorganisms related to the initial raw materials such as Pichia, Lactobacillus in the microbial agent and Hypsizygus in SMS could not adapt to the high-temperature environment (>60 °C) and were replaced by thermophilic bacteria after 5 days of composting.