The whitefly transmitted begomovirus Tomato yellow leaf curl virus (TYLCV) spread from the Middle East to become a near global problem for tomato production in the 1990s. This spread is believed to have occurred due to the global trade in live tomato planting material. Recently the important strains of TYLCV, “Israel” and “Mild”, in the Middle East have been shown to associate with the betasatellite Cotton leaf curl Gezira betasatellite (CLCuGeB). Betasatellites encode a potent suppressor of transcriptional and post‐transcriptional gene silencing and enhance virus symptoms and crop losses. The TYLCV‐CLCuGeB complex compromises Ty‐1 resistance, the major part of the arsenal of measures to reduce losses due to TYLCV. The events leading to this situation, the threat the complex poses to global tomato production and the need to urgently identify resistance to the complex are outlined.

中文翻译：

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番茄黄叶卷曲病毒与β卫星的相互作用-对番茄生产的全球威胁

粉虱传播的begomovirus番茄黄叶卷曲病毒（TYLCV）从中东传播，在1990年代成为番茄生产的近乎全球性的问题。据信这种扩散是由于活番茄种植材料的全球贸易而发生的。最近，中东地区的重要TYLCV菌株“以色列”和“轻度”已显示出与β-卫星卫星棉叶卷曲的Geziraβ-卫星（CLCuGeB）有关。Betasatellite编码一种有效的转录和转录后基因沉默抑制子，并增强病毒症状和农作物损失。TYLCV-CLCuGeB复合体危害Ty-1抵抗，减少TYLCV造成的损失的措施的主要部分。概述了导致这种情况的事件，该复合物对全球番茄生产构成的威胁以及迫切需要确定对该复合物的抗性的需求。