Abstract
Pogostemon cablin is one of the well-known Southern Chinese medicinal plants with detoxification, anti-bacterial, anti-inflammatory, and other pharmacological functions. Identification and characterization of phytopathogens on P. cablin are of great significance for the prevention and control of diseases. From spring to summer of 2019 and 2020, a leaf spot disease on Pogostemon cablin was observed in Guangdong Province, South China. The pathogen was isolated and identified based on both morphological and DNA molecular approaches. The molecular identification was conducted using multi-gene sequence analysis of large subunit (LSU), the nuclear ribosomal internal transcribed spacer (ITS), beta-tubulin (β-tubulin), and RNA polymerase II (rpb2) genes. The causal organism was identified as Stagonosporopsis pogostemonis, a novel fungal species. Pathogenicity of Stagonosporopsis pogostemonis on P. cablin was fulfilled via confining the Koch’s postulates, causing leaf spots and stem blight disease. This is the first report of leaf spot diseases on P. cablin caused by Stagonosporopsis species worldwide.
Highlights
Pogostemon cablin is a perennial aromatic herb, generally known as “Patchouli” or “Guanghuoxiang” [1]
As a well-known medicinal plant in traditional Chinese medicine, Pogostemon cablin is recognized for its detoxification, and other pharmacological features [5]
P. cablin is often affected by various diseases during its growth and development, that affect medicinal value [7]
Summary
Pogostemon cablin is a perennial aromatic herb, generally known as “Patchouli” or “Guanghuoxiang” [1]. Pogostemon cablin adapts to hot and humid climatic conditions and is mostly cultivated in the Philippines and some other tropical regions, including China. This plant is wildly grown in Southern China, including. As a well-known medicinal plant in traditional Chinese medicine, Pogostemon cablin is recognized for its detoxification, and other pharmacological features [5]. It contains a variety of natural antibacterial compounds, and has antibacterial and anti-inflammatory effects [6]. Bacterial wilt caused by Ralstonia solanacearum [8], root-knot disease caused by Meloidogyne incognita [9,10], some viral diseases [11], and the fungal disease by Corynespora cassiicola causing leaf spot [12] are reported
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