Abstract
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Among apple viruses, the present study identified Apple stem grooving virus infection in Bauhinia variegata . CP gene of the isolate clustered with kiwi isolate, however, differing in biological characteristics.
Abstract
Bauhinia variegata, widely distributed in Kangra district (Himachal Pradesh, India), was found to exhibit severe virus-like symptoms, which included chlorosis, chlorotic and necrotic spots, mottling, leaf distortion and grooves on the stem. Symptomatic leaf samples collected from three different locations in the district, viz. CSIR-IHBT (Palampur), CSK HPKV (Palampur) and Dharamshala were analyzed by DAS-ELISA, dot blot hybridization and RT-PCR for the presence of ASGV infection. The combined results of three detection techniques showed 9 out of 30 samples to be positive for the virus. To understand the incidence of other major apple viruses, samples were also analyzed by multiplex RT-PCR. However, only ASGV was detected from the samples. Complete CP gene from four of the positive samples was amplified by RT-PCR and confirmed through sequencing and BLAST analysis of the amplicons. Phylogenetically, three isolates (abbreviated as BAU1, BAU2 and BAU18) clustered with apple isolates from India, Brazil and China, while one (BAU16) clustered separately. All the four isolates shared 94–99 % sequence identity at amino acid level and 87–98 % sequence identity at nucleotide level with all the other isolates from various geographical locations and differing hosts. To the best of our knowledge, this is a first report describing ASGV infection on B. variegata, its molecular characterization, and diversity analysis and incidence study. The tree probably acts as a reservoir of ASGV as it is found actively growing around apple nursery plantations, while no other apple virus was diagnosed from Bauhinia.
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Acknowledgments
The authors are thankful to the Director, CSIR-Institute of Himalayan Bioresource Technology Palampur, HP (India), for providing necessary facilities. Department of Biotechnology (DBT), (grant no. BT/PR/11001PBD/16/803/2008), India is duly acknowledged for financial support. Academy of Scientific and Innovative Research (AcSIR), New Delhi, is also acknowledged. This is CSIR-IHBT publication number 3745.
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Communicated by W. Osswald.
Aijaz A. Zaidi: Deceased.
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Bhardwaj, P., Ram, R., Zaidi, A.A. et al. Natural occurrence of Apple stem grooving virus on Bauhinia variegata . Trees 29, 1415–1422 (2015). https://doi.org/10.1007/s00468-015-1219-y
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DOI: https://doi.org/10.1007/s00468-015-1219-y