| molecular characterization of two distinct begomoviruses from papaya in china. | six papaya samples showing downward leaf curling were collected in guangdong and guangxi provinces, china. the result of tas-elisa showed they were all infected by geminiviruses. comparison of partial dna-a sequences reveals that these virus isolates can be classified into two groups. group i includes isolates g2, g4, g5, g28 and g29 from guangxi province, while isolate gd2 from guangdong province belongs to group ii. the complete dna-a sequence of g2 and gd2 were characterized. sequence compari ... | 2004 | 15550769 |
| [the c4 proteins of ageratum yellow vein china virus and stachytarpheta leaf curl virus are suppressors of rna silencing]. | rna silencing is a highly conserved mechanism in many eukaryotic organisms that involves sequence-specific rna degradation. one of the important roles of rna silencing is antiviral infection. to counter this defense mechanism, many plant viruses have evolved or acquired functional proteins (suppressors) for suppression of rna silencing. geminiviruses are a family of small circular single-stranded dna (ssdna) viruses that cause severe diseases in major crop plants worldwide. ac2 (c2) and ac4 (c4) ... | 2007 | 17436621 |
| ageratum yellow vein china virus is a distinct begomovirus species associated with a dnabeta molecule. | abstract ageratum conyzoides plants exhibiting yellow vein symptoms, collected near haikou, hainan province, china, contained begomoviral dna-a-like molecules. the complete sequences of the molecules from two samples, hn2 and hn2-19, were shown to consist of 2,768 and 2,748 nucelotides (nt), respectively. these sequences have more than 97% nucleotide sequence identity, but less than 86% identity with other reported begomovirus sequences. in line with the taxonomic convention for begomoviruses, h ... | 2007 | 18943280 |
| complete genome sequence of a new begomovirus associated with yellow mosaic disease of hemidesmus indicus in india. | the complete dna a genome of a virus isolate associated with yellow mosaic disease of a medicinal plant, hemidesmus indicus, from india was cloned and sequenced. the length of dna a was 2825 nucleotides, 35 nucleotides longer than the unit genome of monopartite begomoviruses. comparison of the nucleotide sequence of dna a of the virus isolate with those of other begomoviruses showed maximum sequence identity of 69 % to dna a of ageratum yellow vein china virus (ayvcnv; aj558120) and 68 % with to ... | 2014 | 24276235 |
| identification and molecular characterization of two begomoviruses from pouzolzia zeylanica (l.) benn. exhibiting yellow mosaic symptoms in adjacent regions of china and vietnam. | two monopartite begomoviruses were isolated from pouzolzia zeylanica (l.) benn. plants showing yellow mosaic symptoms in gaoyao, guangdong province, china (gd1) and in phu tho, vietnam (vn), respectively. a comparison of the complete genome sequence of gd1 (2,739 nucleotides [nt]) with vn (2,741 nt) indicated that they shared 86.2 % nt sequence identity. gd1 and vn shared the highest nucleotide sequence identity at 86.7 % and 91.4 % respectively, with isolate ty01 of pouzolzia golden mosaic viru ... | 2014 | 24838912 |