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• W4280495112 abstract "Ficus religiosa (L.) belongs to the family Moraceae, native to India and commonly known as 'Peepal'. It has high medicinal value due to its antibacterial, antiviral and antioxidant properties (Singh et al., 2015; Kalpana et al., 2009). In August 2021, leaf spots were observed on F. religiosa trees in Pabbi forest park Kharian (32°50'01.4N 73°50'17.7E), District Gujrat, Pakistan. The disease incidence was recorded approximately 30%. The leaf spots were irregular in shape, brown in colour, 3-9 mm in size and encircled by yellowish halo. In severe condition, the spots coalesced and produced necrotic areas on leaf surface (Figure 1). The samples (n=21) were collected based on symptoms and infected leaf segments were excised into small pieces, surface disinfected with 1% NaClO for 20s and rinsed 3 times with sterilized distilled water. The pieces were plated on Potato Dextrose Agar (PDA) medium and incubated at 28°C for 7 days. All the pure cultures were obtained through single spore method on PDA and preserved in 30% glycerol at -80°C. The colonies were olive green to dark brown with white margin and later turned dark olive or black with enormous sporulation. Conidia (n=24) were obclavate, ovoid, brown in colour and measuring 10.2 to 34.1 µm long x 5.9 to 12.3 µm wide with 1 to 6 transverse and 1 to 3 longitudinal septa (Figure 2). Based on these characteristics, the pathogen was identified as Alternaria alternata (Gilardi, G., et al. 2019). For molecular identification, the Internal Transcribed Spacers (ITS) region, endopolygalacturonase (endoPG) gene and major allergen (Alt a1) gene were amplified using ITS1/4 (White et al. 1990), PG3/PG2b (Andrew et al. 2009) and Alt-4for/Alt-4rev (Lawrence et al. 2013) primers respectively. Based on molecular characteristics, all isolates were identified as A. alternata. The sequences of the representative isolate FLB-1 were submitted in the GenBank with the accession numbers OL514181 for ITS, OK315658 for endoPG and OK315659 for Alt al showing 100% similarity with ITS accession KP124298, and endoPG accession AY205020 and 99.7% with Alt al accession KP123847 sequences of CBS106.24 A. alternata after BLASTn queries. The Phylogenetic reconstruction based on maximum likelihood, using Mega X (Kumar et al. 2018) and FLB-1 grouped with A. alternata (Figure 3). Pathogenicity test was performed on nine months old healthy F. religiosa (L.) seedlings (n=12) to fulfil the Koch's postulates. The leaves were pinpricked and sprayed with FLB-1 conidial suspension (107 spores/ml) by using atomizer (Bajwa et al., 2010). The leaves of F. religiosa (L.) seedlings (n=12) sprayed with sterilized distilled water served as control. All the seedlings were incubated at 25 ± 3°C in the glasshouse. The experiment was performed three times under the same conditions. The typical symptoms appeared on inoculated leaves after 7-14 days that were similar to the symptoms observed on original infected F. religiosa (L.) trees. In the control treatment leaves remained asymptomatic (Figure 4). The pathogen from the artificial infected leaves was re-isolated and identified as A. alternata based on morphological and molecular characteristics. To our knowledge, this is the first report of leaf spot of F. religiosa (L.) caused by A. alternata in Pakistan. The leaves of F. religiosa (L.) are commonly used in Asia for different purposes and this leaf spot disease may represent a significant threat to F. religiosa (L.) tree health." @default.
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• W4280495112 date "2022-12-01" @default.
• W4280495112 modified "2023-10-15" @default.
• W4280495112 title "First Record of Leaf Spot of <i>Ficus religiosa</i> Caused by <i>Alternaria alternata</i> in Pakistan" @default.
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• W4280495112 doi "https://doi.org/10.1094/pdis-12-21-2715-pdn" @default.
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