Abstract
The vein clearing (kokke kandu) disease suspected to be caused by an unknown virus is an important production constraint of cardamom in India. In the present study the causal virus was transmitted from infected to healthy cardamom plants through the aphid, Pentalonia caladii. Small RNA (sRNA) and RNA sequencing (RNA-seq) of the aphid-inoculated plant showed several nucleorhabdovirus-like contigs. The sRNA and RNA-seq results were verified through reverse transcription polymerase chain reaction (RT-PCR) using total RNA from infected plant and primers designed from the contigs. The cloning and sequencing of RT-PCR products resulted in a sequence of 13,392 bases that showed similarities to nucleorhabdoviruses. The sequenced region contained six open reading frames in the order 3’-N-P-P3-M-G-L-5′ and showed nucleotide sequence identities ranging from 37 to 55% with nucleorhabdoviruses indicating its distinct nature for which we propose the name, cardamom vein clearing virus. A reliable RT-PCR and SYBR Green-based real-time RT-PCR assays were developed for the detection of the virus that will aid in the identification and propagation of virus-free cardamom plants.
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Acknowledgements
Authors are thankful to Science and Engineering Research Board (SERB), Government of India for the funding (EMR/2016/001135), Head (Division of Crop Protection), Distributed Information Sub Centre and Director, ICAR-Indian Institute of Spices Research, Kozhikode, Kerala, India for facilities.
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Bhat, A.I., Pamitha, N.S., Naveen, K.P. et al. Identification and characterization of cardamom vein clearing virus, a novel aphid-transmitted nucleorhabdovirus. Eur J Plant Pathol 156, 1053–1062 (2020). https://doi.org/10.1007/s10658-020-01958-2
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DOI: https://doi.org/10.1007/s10658-020-01958-2