Molecular Identification for Sweet Potato Leaf Curl Virus Isolated in Fujian

Molecular characteristics of the sweet potato leaf curl virus (SPLCV) in Fujian province were studied. Specific segments of the genome were recovered, cloned and sequenced using selected primers. A sequence analysis positively confirmed the segments to be a part of SPLCV. Then, the full-length SPLCV was constructed with a pair of primers Q, and sequenced. The previously reported general purpose primers, PCRc1/PBLlv, for DNA-B were used for the subsequent amplification. The genome of SPLCV was found to be 2 827 bp containing 6 ORFs with DNA-A but not DNA-B (GenBank accession number:KT202303). The nucleotide homology between the isolated genome and the reported 6 other geminiviridae genomes was less than 85%;and, between it and SPLCV was the highest at 95.94%. In addition, the isolate shared a close genetic relationship with other isolates from Henan, Jiangsu, Zhejiang, South Korea, and the United States belonging to a same subgroup but in different branches.