Natural occurrence of mesta yellow vein mosaic virus and DNA-satellites in ornamental sunflower (Helianthus spp.) in Pakistan

Saudi Journal of Biological Sciences

Z. Iqbal¹  M. Naeem Sattar²  S. Najabat Ali²  M. Khurshid³  M. Shafiq⁴  I. Amin⁵ 

[1] Corresponding authors.;Central Laboratories, King Faisal University, Al-Ahsa 31982, Saudi Arabia;Department of Biotechnology, Faculty of Sciences, University of Sialkot, Sialkot, Pakistan;National Institute for Biotechnology and Genetic Engineering (NIBGE), 38000 Faisalabad, Pakistan;School of Biochemistry and Biotechnology, University of the Punjab, Quaid-e-Azam campus, P.O. Box 54590, Lahore, Pakistan;

关键词: Absolute quantification;    Alphasatellite;    Betasatellite;    Genome diversity;    Mesta yellow vein mosaic virus (MeYVMV);    Ornamental sunflower;   

DOI  :  

来源: DOAJ

【 摘 要 】

Weeds and ornamental plants serve as a reservoir for geminiviruses and contribute to their dissemination, genome recombination and/or satellite capture. Ornamental sunflower (Helianthus spp.) plants exhibiting mild leaf curl symptoms were subjected to begomovirus and DNA-satellites isolation. The full-length genome of the isolated begomovirus clone (Od1-A) showed 96.8% nucleotide (nt) sequence identity with mesta yellow vein mosaic virus (MeYVMV; accession no. FR772081) whereas, alphasatellite (Od1-a) and betasatellite (Od1-b) clones showed their highest nt sequence identities at 97.4% and 98.2% with ageratum enation alphasatellite (AEA; accession no. FR772085) and papaya leaf curl betasatellite (PaLCuB; accession. no. LN878112), respectively. The evolutionary relationships, average evolutionary divergence and the recombination events were also inferred. The MeYVMV exhibited 9.5% average evolutionary divergence and its CP and Rep had 9.3% and 12.2%, concomitantly; the alphasatellite and the betasatellite had 8.3% and 5.2%, respectively. The nt substitution rates (site-1 year−1) were found to be 6.983 × 10-04 and 5.702 × 10-05 in the CP and Rep of MeYVMV, respectively. The dN/dS ratio and the Tajima D value of MeYVMV CP demonstrated its possible role in host switching. The absolute quantification of the begomovirus demonstrated that mild symptoms might have a correlation with low virus titer. This is the first identification of MeYVMV and associated DNA-satellites from ornamental sunflower in Pakistan. The role of sequence divergence, recombination and importance of MeYVMV along with DNA-satellites in extending its host range is discussed.

【 授权许可】

Unknown