PHIM Plant Health Institute, CIRAD, INRAE, Univ Montpellier, Institut Agro, IRD, 34398 Montpellier Cedex 5, France.
Viruses. 2024 Sep 5;16(9):1420. doi: 10.3390/v16091420.
Begomoviruses, transmitted by the whitefly , pose significant threats to global agriculture due to their severe impact on various crops. Among the satellite molecules associated with begomoviruses, betasatellites play a crucial role in enhancing disease severity and yield losses. The spread and association of these molecules with helper viruses in host plants are thus matters of concern. Here, we focus on the propagation of betasatellites and, more specifically, on their transfer between different helper viruses and hosts through vector transmission. Our results show that the cotton leaf curl Gezira betasatellite (CLCuGeB), initially acquired with its helper virus cotton leaf curl Gezira virus (CLCuGeV) from an okra plant, can be transmitted and assisted by a different helper virus, tomato yellow leaf curl virus (TYLCV), in a different host plant (tomato plant). The new association can be formed whether TYLCV and CLCuGeB encounter each other in a host plant previously infected with TYLCV or in whiteflies having acquired the different components separately. Our findings reveal two pathways by which betasatellites can be transferred between helper viruses and host plants and highlight the ability of betasatellites to spread in begomovirus-infected environments.
双生病毒，通过粉虱传播，对全球农业造成严重威胁，因为它们对各种作物都有严重的影响。在与双生病毒相关的卫星分子中，贝塔卫星在增强疾病严重程度和产量损失方面起着关键作用。因此，这些分子在宿主植物中的传播和与辅助病毒的关联是值得关注的问题。在这里，我们专注于贝塔卫星的传播，更具体地说，关注它们通过媒介传播在不同辅助病毒和宿主之间的转移。我们的结果表明，最初从秋葵植物中与辅助病毒棉叶卷曲圭亚那病毒（CLCuGeV）一起获得的棉花卷曲圭亚那贝塔卫星（CLCuGeB），可以在不同的宿主植物（番茄植物）中由不同的辅助病毒番茄黄卷叶病毒（TYLCV）进行传播和辅助。新的关联可以在先前感染 TYLCV 的宿主植物中或在分别获得不同成分的粉虱中形成，无论 TYLCV 和 CLCuGeB 是相遇还是不相遇。我们的研究结果揭示了贝塔卫星在辅助病毒和宿主植物之间转移的两种途径，并强调了贝塔卫星在双生病毒感染环境中传播的能力。
