[Sequence analysis of the complete genome of papaya ringspot virus hainan isolate].
Total RNA was extracted from infected papaya (Carica papaya L.) leaves in Hainan Province, and the full-length sequences of papaya ringspot virus were amplified by RT-PCR and RACE, and its complete genomic sequence was assembled, named Hainan-P isolate. The RNA genome sequence of Hainan-P isolate was 10323 nucleotides (nts)in length,excluding the 3'-terminal poly(A) tail. And it was composed of a single open reading frame encoding a polyprotein of 3343 amino acids.. The result of homology analysis with twelve GenBank PRSV isolates showed that the polyprotein identity of Hainan-P ranged from 89. 8% to 93.2%, that was higher than the complete nt homology of 82.3% to 89.1%. The P1 amino acid was the least conserved (sharing homology only between 65.4% and 80.1%), whereas HC-Pro, CI and CP were the most conserved. Phylogenetic tree were constructed by the Neighbor-joining method in MEGA 3.1, which showed that PRSV isolates were obviously relevant to geographical origin, and it was impossible to delineate host-specific (P type and W type)evolution.
State Key Biotechnology Laboratory for Tropical Crops, Institute of BioScience and Biotechnology, CATAS, Haikou 571101, China. lu-ya-wei@hotmail.com
Ya-Wei
YW
Lu
Wen-Tao
WT
Shen
Qing-Jie
QJ
Tang
Yan-Mei
YM
Niu
Peng
P
Zhou
D029441:Carica / Q000821:virology*; D016679:Genome, Viral; D010802:Phylogeny; D017800:Potyvirus / Q000145:classification / Q000235:genetics*