Abstract:Leaf spots were observed on commercial plants of Bai Zhu (Atractylodes macrocephala Koidz.), a perennial herb that is used in traditional Chinese medicine in Panan County of Zhejiang Province, China. Approximately, 40% of the plants surveyed in the field showed severe symptoms of leaf spot during the summer of 2011. Fungal isolates obtained from infected leaf tissues were grown on Potato Dextrose Agar (PDA), and morphological characteristics of the colonies and the sporulating apparatus were determined. DNA ex… Show more
“…Gene sequences were deposited in the NCBI database and were assigned with accession numbers (C. capsici (AAUBC-Cc1) -MH010314, A. alternata (AAUBC-Aa1) -MH010315 and P. byssoides (AAUBC-Pb1) -MH010316). Similar findings were reported by (Torres-Calzada et al, 2011;Guo-yin et al, 2013).…”
Bio-efficacy of different biological control agents for the management of chilli fruit rot/anthracnose disease ABSTRACT: Chilli (Capsicum annum L.) an important economic crop worldwide is severely infected by fruit rot disease which may cause yield losses of up to 100%. Although different chemical fungicides are being recommended and used for the management of the disease, biocontrol-based strategy attracts considerable attention and offers great potential of novel biocontrol agents. Further, biological control methods for chilli fruit rot/anthracnose disease have not received much attention. Therefore, an investigation was carried out to assess the efficacy of different biological control agents against chilli fruit rot/anthracnose disease. Antagonistic yeast isolates Pichia guillermondii (Y-12), Hanseniaspora uvarum (Y-73) and Trichoderma asperellum (Th-3), Pseudomonas fluorescens (Pf-1) were tested through seed treatment, seedling dip and foliar spray at concentration of 2 × 10 8 cfu/g. The pathogens viz., Colletotrichum capsici, Alternaria alternata and Periconia byssoides were found associated with fruit rot during the study. Lowest mean disease intensity (MDI), highest disease control (DC) over untreated control was recorded in the treatment P. guillermondii (Y-12) (5.39% MDI, 64.72% DC) and this was found at par with the treatment P. fluorescens (Pf-1) (5.92% MDI, 65.52% DC). However, T. asperellum (Th-3) showed satisfactory results. The present study highlights the efficacy of antagonistic yeast species against chilli fruit rot pathogens and these findings serve as base for further exploration and exploitation of yeast species for eco-friendly management of crop diseases.
“…Gene sequences were deposited in the NCBI database and were assigned with accession numbers (C. capsici (AAUBC-Cc1) -MH010314, A. alternata (AAUBC-Aa1) -MH010315 and P. byssoides (AAUBC-Pb1) -MH010316). Similar findings were reported by (Torres-Calzada et al, 2011;Guo-yin et al, 2013).…”
Bio-efficacy of different biological control agents for the management of chilli fruit rot/anthracnose disease ABSTRACT: Chilli (Capsicum annum L.) an important economic crop worldwide is severely infected by fruit rot disease which may cause yield losses of up to 100%. Although different chemical fungicides are being recommended and used for the management of the disease, biocontrol-based strategy attracts considerable attention and offers great potential of novel biocontrol agents. Further, biological control methods for chilli fruit rot/anthracnose disease have not received much attention. Therefore, an investigation was carried out to assess the efficacy of different biological control agents against chilli fruit rot/anthracnose disease. Antagonistic yeast isolates Pichia guillermondii (Y-12), Hanseniaspora uvarum (Y-73) and Trichoderma asperellum (Th-3), Pseudomonas fluorescens (Pf-1) were tested through seed treatment, seedling dip and foliar spray at concentration of 2 × 10 8 cfu/g. The pathogens viz., Colletotrichum capsici, Alternaria alternata and Periconia byssoides were found associated with fruit rot during the study. Lowest mean disease intensity (MDI), highest disease control (DC) over untreated control was recorded in the treatment P. guillermondii (Y-12) (5.39% MDI, 64.72% DC) and this was found at par with the treatment P. fluorescens (Pf-1) (5.92% MDI, 65.52% DC). However, T. asperellum (Th-3) showed satisfactory results. The present study highlights the efficacy of antagonistic yeast species against chilli fruit rot pathogens and these findings serve as base for further exploration and exploitation of yeast species for eco-friendly management of crop diseases.
“…Although a disease caused by Alternaria has been reported on A. lancea in China and Korea (Romain et al 2022;Tan et al 2013), an Alternaria disease of A. lancea had not been previously reported in Japan. Therefore, we refer to this new disease as black spot disease of A. lancea (Kokuhan-byo in Japanese).…”
Atractylodes lancea is a medicinal plant that has been used in traditional Chinese and Japanese herbal medicines. In 2020, A. lancea plants with leaf spot were identi ed in Ibaraki, Japan. We isolated fungi from the leaf spot symptom, and in inoculation tests, the isolate reproduced these symptoms. The isolate was identi ed as Alternaria gaisen based on conidial morphology and sequences of three genomic regions (rpb2, gapdh, and tef1). To our knowledge, this is the rst report of leaf spot of A. lancea caused by A. gaisen.
The complete genome sequence of a member of a distinct species of the genus Carlavirus in the family Betaflexiviridae, tentatively named atractylodes mottle virus (AtrMoV), has been determined. Analysis of its genomic organization indicates that it has a single-stranded, positive-sense genomic RNA of 8866 nucleotides, excluding the poly(A) tail, and consists of six open reading frames typical of members of the genus Carlavirus. The individual open reading frames of AtrMoV show moderately low sequence similarity to those of other carlaviruses at the nucleotide and amino acid sequence levels. Pairwise comparison and phylogenetic analysis suggest that AtrMoV is most closely related to chrysanthemum virus B.
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