Penicillium section Lanata-divaricata from acidic soil.

Area of Science:

• Mycology
• Environmental Microbiology
• Fungal Taxonomy

Background:

• Penicillium species in the section Lanata-divaricata are common soil fungi.
• Their occurrence and characteristics in acidic soils are under-investigated.
• A survey of Penicillium species in China focused on soil isolates.

Purpose of the Study:

• To investigate Penicillium species diversity in Chinese soils, particularly acidic environments.
• To phylogenetically characterize isolates from the Lanata-divaricata section.
• To describe new species and assess their growth under varying pH conditions.

Main Methods:

• Isolation of 60 Penicillium strains from the Lanata-divaricata section from soil samples.
• Phylogenetic analysis using internal transcribed spacer (ITS), BenA, CaM, and RPB2 gene sequences.
• Macroscopic and microscopic observations for species description.
• Growth rate determination at acidic (pH 4), neutral (pH 7), and alkaline (pH 10) conditions.

Main Results:

• Identification of seven accepted species and 13 novel lineages within Penicillium section Lanata-divaricata.
• Description of 13 new fungal species based on phylogenetic and morphological data.
• Eleven new species were identified as acid-preferential, growing faster at pH 4.
• Penicillium viridissimum showed optimal growth at neutral pH, and Penicillium guangxiense at alkaline pH.

Conclusions:

• The study describes significant new fungal diversity in Penicillium section Lanata-divaricata from Chinese soils.
• Many newly described species exhibit acid-preferential or acid-tolerant growth characteristics.
• Targeted isolation from unique environments reveals fungal diversity with specific physiological adaptations.