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有许多种病毒及其株系可以侵染植物,染病后植物会表现出多种多样的病症,下面就病毒引起的寄主植物的外部症状、内部症状及生理、代谢变化分别加以叙述。一、病毒引起的寄主植物外部症状植物染病后,常表现为叶片异常。不同病毒侵染对叶片的影响也不同。最为常见的是花叶病症,烟草花叶病毒侵染烟草植株引起斑驳、花叶。在花叶病中,叶片通常出现暗绿、亮绿相间的绿色区域,并有断续斑纹出现,也有在叶片上出现黄色区域,有时还伴有凸起的疱状斑点。在芜菁花叶病毒组病毒感染的叶片中,颜色差异系由叶绿体结团和退化引起。在暗绿色区域,叶绿体分布正常;而在亮绿色区域,叶绿体结团;在绿色最亮区域,叶绿
There are many kinds of viruses and their strains that can infect plants. After the plants are infected, they show a variety of diseases. The following describes the external symptoms, internal symptoms, physiological and metabolic changes of the host plants caused by viruses. First, the virus caused by the external symptoms of host plants after plant disease, often manifested as abnormal leaves. The effects of different virus infections on the leaves are also different. The most common is mosaic disease, Tobacco mosaic virus infects tobacco plants caused by mottling, mosaic. In mosaic disease, the leaves usually appear dark green, bright green and white areas with intermittent stripes appear, there are yellow areas on the leaves, and sometimes accompanied by bulging bulging spots. In the leaves infected with the turnip mosaic virus group, the color differences were caused by chloroplast clumps and degeneration. In the dark green area, the distribution of chloroplast is normal; in the bright green area, the chloroplast clumps; in the lightest green area,