Mealy bug transmission of sugar cane bacilliform and sugar cane clostero-like viruses
| MSI99P1053 | |
| Lockhart, B. E. L. Autrey, L. J. C. | |
| Mealy bug transmission of sugar cane bacilliform and sugar cane clostero-like viruses | |
| 3rd ISSCT Sugar Cane Pathology Workshop, Mauritius, 22-26 July 1991 | |
| Conference paper | |
| 1991 | |
| Abstract in Sug. Cane 1992 (1): 25 | |
| En | |
| En | |
| Sugar cane bacilliform badnavirus (SCBV), a dsDNA plant virus, was first described in 1985, and has recently been found to be widely distributed in noble canes. Sugar cane clostero-like virus (SCCV), which has flexuous filamentous particles measuring 1500-1600 x 12 nm, has recently been described from both noble canes in germplasm collections as well as from commercial cultivars in several locations. To date, all sugar cane clones infected naturally by SCCV have been infected with SCBV. In some clones (e.g. Iscambine, M27/16) mixed SCBV-SCCV infection is associated with prominent chlorotic stippling and streaks on leaves, whereas in other clones (e.g. NCo 376, B 41227) no foliar symptoms are apparent. Neither SCBV nor SCCV was transmitted from infected sugar cane to the virus-free clones IK 76319 and CL 61620 by Melanaphis sacchari, but both viruses were transmitted by the pink sugar cane mealy bug Saccharicoccus sacchari (Cockerelle). Transmission of both viruses to healthy test plants was verified by electron microscopy, immuno-electron microscopy and enzyme immunoassay. Plant badnaviruses occur most frequently in nature in mixed infections with other viruses, and the dependence of rice tungro bacilliform virus (RTBV) on a transmissibility factor produced by the associated rice tungro spherical virus (RTSV) invokes the possibility of a similar dependence existing for other plant badnaviruses. From IK 76319, in which SCBV apparently multiplies poorly and attains a low concentration, SCCV was transmitted singly by S. sacchari to healthy plants of the same clone. From IK 76319 infected only with SCCV, the virus was transmitted by S. sacchari to healthy IK 76319 and CL 61620. Similarly, SCBV was transmitted by S. sacchari from NG 57239, infected only with SCBV, to healthy CL 61620. These results indicate that transmission of SCBV and SCCV by S. sacchari is not dependent on the simultaneous presence of both viruses nor on any factor associated with infection by either virus. After 12 months, test plants of CL 61620 infected with SCBV by mealy bug transmission whowed no foliar symptoms. Plants infected with SCCV only showed a very mild interveinal mosaic on some leaves, while plants infected with both SCBV and SCCV showed very mild mosaic, narrowing of leaves, reduced vigour, shortening of terminal internodes, occasional chlorotic stripes, and occasional dieback of ratoon shoots. These observations were made under greenhouse conditions, and no trials have been done to compare the growth and appearance of healthy and virus-infected plants under typical field conditions. SCBV was transmitted by S. sacchari from infected sugar cane to healthy banana (cv. Grand Nain). SCBV-infected banana developed symptoms indistinguishablle from those described for banana streak virus (BSV) infection. SCBV and BSV are serologically indistinguishable, and BSV is readily transmitted to sugar cane by mechanical inoculation, but previous attempts to infect banana with SCBV have have failed. There is now ample justification to consider SCBV and BSV as the same virus. | |
| SUGARCANE PLANT VIRUSES DISEASE TRANSMISSION DISEASES SUGAR CANE BACILLIFORM VIRUS SUGARCANE CLOSTERO-LIKE VIRUS | |
| MAURITIUS | |
| Sugarcane: Diseases and disease management | |
| 1992-07-13 | |
| En | |
| University of Minnesota, Department of Plant Pathology Mauritius Sugar Industry Research Institute | |
| PATH |