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First Report of Cucurbit aphid-borne yellows virus infecting five cucurbits in India. | LitMetric

First Report of Cucurbit aphid-borne yellows virus infecting five cucurbits in India.

Plant Dis

I.A.R.I, Regional Station, Pune, Maharashtra, India, 125 ITI Road Aundh, Pune, Maharashtra, India, 411067;

Published: October 2023

AI Article Synopsis

Article Abstract

Cucurbits are among the most popular vegetables cultivated globally. They have high economic importance, especially in India, where they are cooked and eaten as vegetables (Dhillon et al. 2016). In February 2023, yellowing symptoms were observed on cucurbitaceous species, viz. (Snake gourd - SG), (Ridge gourd - RG), (Bottle gourd - BG), (Sponge gourd - SPG) and yellow chlorotic spots were recorded on (Ash gourd - AG) growing in the experimental farm at the Indian Agricultural Research Institute, Regional Station, Pune (Supplementary Figure 1). The average disease incidence ranged from 5% to 30%. A total of 175 leaf samples, including thirty symptomatic and five asymptomatic plants of each cucurbit, were collected and tested by DAS-ELISA using antisera against cucurbit aphid-borne yellows virus (CABYV) (DSMZ, Germany), cucurbit yellow stunting disorder virus (CYSDV) (Arsh Biotech, India), cucumber mosaic virus (CMV), zucchini yellow mosaic virus (ZYMV), and papaya ringspot virus (PRSV) (Agdia, USA). All 150 symptomatic cucurbit samples tested positive for CABYV, while five samples from SG, 14 from RG, two from AG, and 11 from SPG hosts were also positive for PRSV. Asymptomatic samples were negative for all viruses tested. In order to further confirm the presence of the virus, total RNA was extracted from ten samples of each cucurbit host that were positive only for CABYV and the asymptomatic samples using the RNeasy Plant Mini Kit (Qiagen, Germany) as per the manufacturer's protocol. Two-step RT-PCR was carried out using the extracted RNA and CABYV-specific primers, amplifying c. 484 bp of the coat protein gene region (Boubourakas et al. 2006). Amplicons of expected size were obtained in all symptomatic samples, whereas the asymptomatic samples tested negative. Three amplicons obtained from positive samples from each of the cucurbit species were directly sequenced and found to be identical to each other. A representative virus sequence obtained from each cucurbit was deposited in GenBank (Snake gourd - OQ921128, Ridge gourd - OQ921127, Bottle gourd - OQ921126, Ash gourd - OQ921125, Sponge gourd - OQ921129). In BLASTn analysis, the isolates shared from 94.23 to 100% nucleotide identities with the Indian CABYV isolates of various cucurbits and clustered closely with other Pune isolates in the phylogenetic analysis (Supplementary Figure 2). CABYV (genus ) is a single-stranded positive-sense RNA virus, and is known to infect and cause severe economic losses in cucurbits worldwide. Previously, occurrences of CABYV have been reported in cucurbits such as watermelon, bitter gourd, cucumber, squash, teasel gourd, and muskmelon in India (Nagendran et al. 2022; Tripathi et al. 2023). It has also been reported to infect a weed species - from the same geographical region (Verma et al. 2023). To our knowledge, this is the first report of the natural occurrence of CABYV in snake gourd and ridge gourd worldwide and bottle gourd, ash gourd and sponge gourd in India. The present findings have significant epidemiological importance, as they demonstrate that CABYV is spreading to other cucurbits and occurring widely in India.

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Source
http://dx.doi.org/10.1094/PDIS-09-23-1719-PDNDOI Listing

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