A survey of cultivated hybrid sugarcane ( Saccharum inter-specific hybrid) and noble sugarcane ( Saccharum officinarum ) in southern China for the presence of Sugarcane mosaic virus (SCMV), Sorghum mosaic virus (SrMV) and Sugarcane streak mosaic virus (SCSMV) was conducted by RT-PCR from the years 2003 to 2006. SCMV and SrMV, but not SCSMV, were found. A high incidence of SCMV and SrMV coinfection was revealed in both hybrid and noble sugarcanes. All coinfected plants showed mosaic symptom, whereas plants infected with a single virus were symptomatic or asymptomatic. It appears that virus mixtures are more virulent than single infections. The nucleotide sequences of the coat protein (CP) gene of 33 SCMV and 10 SrMV isolates from this study were compared to those of CP genes of SCMV and SrMV reported in GenBank. One hundred and seventy-three SCMV isolates, with the exception of MDB and Abaca strains, can be grouped into five groups, which include three previously known groups, the sugarcane (SCE), maize (MZ), and Thailand groups, and two newly identified groups, the noble sugarcane (NSCE) and Brazil groups. Twenty-two SrMV isolates were divided into two groups, HS (hybrid sugarcane) and NS (noble sugarcane) groups. Five out of eight SrMV hybrid isolates belonged to the HS group, and two SrMV noble isolates and three hybrid isolates were within the NS group. Interestingly, the three hybrid isolates within the NS group were isolated from hybrid sugarcane co-infected with SCMV. This indicates that SCMV helps the NS group SrMV to infect hybrid sugarcane.
Archives of Virology – Springer Journals
Published: Jun 1, 2008
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