Study of viruses co-infecting white clover (Trifolium repens) in China

作者：Qiaolan Liang, Liexin Wei, Bingliang Xu, Alejandro Calderón‐Urrea, Dong Xiang · 发表于：Journal of Integrative Agriculture · 年份：2017 · DOI：10.1016/s2095-3119(16)61606-4 · 被引用次数：13 · 研究领域：Plant Virus Research Studies、Plant and Fungal Interactions Research、Plant pathogens and resistance mechanisms

Globally, white clover (Trifolium repens L.) is commonly infected by plant viruses. It is grown at gardens, roadsides, and public areas as ornamental plants in northern China. Some leaves present disease symptoms that are similar to those of virus infection. However, to our knowledge, no records are available from China regarding white clover (Trifolium repens L.) virus co-infection. To determine the viral species that infect white clover in China, plant samples with virus disease symptoms were collected and virion morphology and ultrastructure morphology of co-infected plants were observed by electron microscopy; viruses were detected by enzyme linked immunosorbent assay (ELISA) and reverse transcription PCR (RT-PCR). Virus co-infection was studied by double antibody sandwich enzyme linked immunosorbent assay (DAS-ELISA) and real-time fluorescence quantitative PCR (RT-qPCR) after rub-inoculation of virus-free white clover planted in a growth chamber (25°C) with a photoperiod of 16 h, using single or several purified virions. Results showed that there were six types of symptoms, including those of shrinking mosaic, shrinking and macular mosaic, severe mottle mosaic, yellow macular mosaic, shrinkage chlorisis, and ring plaque and ring stria. The incidence rates for each symptom were 20.93, 1.48, 16.85, 59.07, 1.30, and 0.37%, respectively, based on the field investigation. Two types of viral pathogens were identified as Alfalfa mosaic virus (AMV) and White clover mosaic virus ...