Identification and taxonomic position of a new Pseudoomphalina species from Pakistan based on light, scanning electron microscopy, and molecular analysis.

Khanspur, a small town located near Ayubia National Park, is a famous mountainous resort lying in Galyat area of Khyber Pakhtunkhwa. It is included in one of the richest biodiversity hotspots in the country. Despite of extensive previous studies, many new species are awaiting to be documented, including macrofungi. In this study, a new macrofungus Pseudoomphalina khanspurensis is analyzed by both light and scanning electron microscopy as well as DNA sequences based on nrITS and nrLSU regions. The sister species P. cokeri differs by its red to purple, dark to reddish brown, broadly convex to applanate pileus, purple blue to brownish stipe, and numerous cylindrical to lageniform cheilocystidia. HIGHLIGHTS: This is the first report of genus Pseudoomphalina from Pakistan and first study based on Scanning electron microscopy. These species have been described with detailed micro-morphological and molecular makers (nrITS and nrLSU). General distribution, ecology, diagnostic features and comparisons with alies have been provided. Graphical representation of DNA extraction and geographical locations of sampling sites are also illustrated. Softwares such as CIPRES Science Gateway Portal, MUSCLE, BioEdit, FigTree, Adobe illustrator and Adobe Photoshop are used in the current study. No member of this genus is already described from Pakistan.

Dose optimization of silicon for boosting arbuscular mycorrhizal fungi colonization and cadmium stress mitigation in maize (Zea mays L.).

The foliar applied silicon (Si) has the potential to ameliorate heavy metals, especially cadmium (Cd) toxicity; however, Si dose optimization is strategically important for boosting the growth of soil microbes and Cd stress mitigation. Thus, the current research was performed to assess the Si-induced physiochemical and antioxidant trait alterations along with Vesicular Arbuscular Mycorrhiza (VAM) status in maize roots under Cd stress. The trial included foliar Si application at the rate of 0, 5, 10, 15, and 20 ppm while Cd stress (at the rate of 20 ppm) was induced after full germination of maize seed. The response variables included various physiochemical traits such as leaf pigments, protein, and sugar contents along with VAM alterations under induced Cd stress. The results revealed that exogenous application of Si in higher doses remained effective in improving the leaf pigments, proline, soluble sugar, total proteins, and all free amino acids. Additionally, the same treatment remained unmatched in terms of antioxidant activity compared to lower doses of foliar-applied Si. Moreover, VAM was recorded to be at peak under 20 ppm Si treatment. Thus, these encouraging findings may serve as a baseline to develop Si foliar application as a biologically viable mitigation strategy for maize grown in Cd toxicity soils. Overall, the exogenous application of Si helpful for reducing the uptake of Cd in maize and also improving the mycorrhizal association as well as the philological mechanism and antioxidant activities in plant under cadmium stress conditions. Also, future studies must test more doses concerning to varying Cd stress levels along with determining the most responsive crop stage for Si foliar application.