I have observed while screening for resistance for yellow vein mosaic virus disease in okra some genotypes inoculated with the virus via whitefly or graft transmission, produce leaf curl symptom and/or yellow vein mosaic too.
Normally, OYVMV does not cause leaf curl in okra. You have to make sure that no other virus is involved.
Ya..you are right Gunilla, that normally OYVMV does not cause leaf curl. But, i have observed some genotypes producing either or both yellow vein mosaic and leaf curl symptoms in different degree of severity when inoculated with pure culture of YVMV. I just want to confirm the reasons why either one or both the symptoms appear in some genotypes ?
The reason must lie in the difference between the genotypes and their interplay with the virus. As a begomovirus, OYVMV is prone to produce new strains all the time, and different genotypes may promote different strains.
This disease is caused by a complex consisting of the monopartite begomovirus Bhendi yellow vein mosaic virus and a small satellite DNA β component. BYVMV can systemically infect bhendi but produces only mild leaf curling in this host. DNA β induces typical symptoms of bhendi yellow vein mosaic disease (BYVMD) when with the begomovirus to bhendi.
Yes, Okra produce Upward curling, green patches on leaf and veinal thickening, a symptom okra enation leaf curl virus.
Sir there is a report also on association of cotton leaf curl and OYVMV in bhendi.
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3784899/
Best luck..
Yes some genotypes exhibit both yvmv and oelcv symptoms in okra, at molecular level there is a linkage drag between these two traits i think so and both viruses were caused by the same begomo viruses.
The problem may be with the incidence of sucking insects like: Jassids, hopper,etc.that sucks the plant sap from underside of the leaves which produce the characteristics leaf curl.
On the field trial, I could not find the YVMV and ELCV together in the same plants. But same field contains both viruses in various okra genotypes. They could be mutated strain of Begomoviruses. Now main challenge is to develop durable virus resistant okra lines. Any suggestion are appreciated to achieve the resistance.
Yes in some genotypes we can see mixed infection of OYVMV and MeYVMV, which produces vein clearing as well as vein thickening .
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