First Report of Iris yellow spot virus Infecting Green Onion in Indonesia

Green onion (Allium fistulosum L.) is an important vegetable crop for small-holder farmers for domestic consumption in Indonesia. Iris yellow spot virus (IYSV; family Bunyaviridae, genus Tospovirus) transmitted by Thrips tabaci is an economically important viral pathogen of bulb and seed onion crops...

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Veröffentlicht in:Plant disease. - 1997. - 97(2013), 12 vom: 05. Dez., Seite 1665
1. Verfasser: Pappu, H R (VerfasserIn)
Weitere Verfasser: Rauf, A
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2013
Zugriff auf das übergeordnete Werk:Plant disease
Schlagworte:Journal Article
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520 |a Green onion (Allium fistulosum L.) is an important vegetable crop for small-holder farmers for domestic consumption in Indonesia. Iris yellow spot virus (IYSV; family Bunyaviridae, genus Tospovirus) transmitted by Thrips tabaci is an economically important viral pathogen of bulb and seed onion crops in many onion-growing areas of the world (1,3). In Asia, IYSV has been reported in India and Sri Lanka (2,4). In April 2013, symptoms suspected to be caused by IYSV were observed on a 1-month-old green onion crop grown for their leaves in a farmer's field in Cipendawa, Pacet, Cianjur District, West Java. Symptoms consisted of elliptical to spindle-shaped, straw colored, irregular, chlorotic lesions with occasional green islands on the leaves. Approximately 25% of the field had plants with these symptoms. The presence of the virus was confirmed with an IYSV-specific Agdia Flash kit. IYSV infection was confirmed by RT-PCR with primers specific to the nucleoprotein (N) gene of IYSV. Primers 465c: 5'-AGCAAAGTGAGAGGACCACC-3' and IYSV-239f: 5' TGAGCCCCAATCAAGACG3' (3) were used as forward and reverse primers, respectively, using total nucleic acids eluted from FTA cards that were previously coated with freshly prepared sap extracts from field samples. Amplicons of approximately 240 bp were obtained from four symptomatic plants tested but not from healthy and water controls. The amplicons were cloned and sequenced. Consensus sequence was derived from three clones. Comparison with IYSV N gene sequences available in GenBank showed sequence identity of 95 to 99% confirming the identity of the virus as IYSV. To our knowledge, this is the first report of IYSV infecting onion in Indonesia. The finding in Java underscores the need for conducting surveys in Java as well as other onion-growing regions of Indonesia to gain a better understanding of its incidence, distribution, and potential impact. References: (1) D. H. Gent et al. Plant Dis. 88:446, 2004. (2) B. Mandal et al. Plant Dis. 96:468, 2012. (3) H. R. Pappu et al. Virus Res. 141:219, 2009. (4) K. S. Ravi et al. Plant Pathol. 55:288, 2006 
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