Johnsongrass [Sorghum halepense (L.) Pers.] is one of the most noxious weeds distributed around the world. Due to its rapid growth, wide dissemination, seeds that can germinate after years in the soil, and ability to spread via rhizomes, S. halepense is difficult to control. From a perspective of plant pathology, S. halepense is also a potential reservoir of pathogens that can eventually jump to other crops, especially corn (Zea mays L.) and sorghum [Sorghum bicolor (L.) Moench]. As one of the most problematic weeds, S. halepense and its diseases can provide useful information concerning its role in diseases of agronomically important crops. An alternative consideration is that S. halepense may provide a source of genes for resistance to pathogens. While some studies have verified that pathogens isolated from S. halepense actually cause disease on host crops through cross inoculation, similarity of disease symptoms and pathogen morphology have been used for identity of the disease agent in most studies. Availability of DNA sequence information has greatly altered and improved pathogen identification, leading to significant changes in phylogenetic assignments. Reclassification of pathogens, especially fungi, raises new questions concerning the role of S. halepense as a disease reservoir. Our goals in this review are to pinpoint, where possible, diseases for which S. halepense acts as a significant pathogen reservoir and to point out problem areas where further research is needed.

中文翻译：

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Johnsongrass (Sorghum halepense) 病害：可能是影响其他植物的病原体库

约翰逊草 [高粱(L.) Pers.] 是分布在世界各地的最有害的杂草之一。由于其生长迅速、传播范围广、种子在土壤中多年后可以发芽，以及通过根茎传播的能力，S. halepense很难控制。从植物病理学的角度来看，S. halepense也是一个潜在的病原体库，最终可以传播到其他作物，尤其是玉米（玉米L.) 和高粱 [双色高粱（L.）蒙奇]。作为最有问题的杂草之一，S. halepense及其病害可以提供有关其在重要农作物病害中作用的有用信息。另一种考虑是S. halepense可能提供抵抗病原体的基因来源。虽然一些研究已经证实从S. halepense实际上通过交叉接种对寄主作物造成疾病，在大多数研究中，疾病症状和病原体形态的相似性已被用于确定病原。DNA 序列信息的可用性极大地改变和改进了病原体鉴定，导致系统发育分配发生重大变化。病原体的重新分类，尤其是真菌，提出了关于病原体作用的新问题。S. halepense作为疾病宿主。我们在本次审查中的目标是在可能的情况下查明哪些疾病S. halepense作为一个重要的病原体库，并指出需要进一步研究的问题领域。