JIPB:华南农业大学周国辉/张彤团队揭示水稻条纹花叶病毒劫持水稻抽穗相关基因促进其昆虫介体的越冬

近日，华南农业大学周国辉/张彤团队在JIPB发表了题为《Rice stripe mosaic virus hijacks rice heading-related gene to promote the overwintering of its insect vector》的研究论文，揭示了水稻条纹花叶病毒劫持水稻抽穗相关基因促进其昆虫介体的越冬。

水稻条纹花叶病毒（RSMV）是我国南方地区一种新出现的水稻病毒，能够显著降低水稻产量。它是由在稻田中越冬的电光叶蝉传播的。

作者的田间调查表明，RSMV感染会导致水稻抽穗延迟，导致大量绿色病株残留在冬季稻田中。这为电光叶蝉和病毒的越冬创造了有利的环境，有可能导致疾病的快速传播和流行。

随后，作者探讨了RSMV操纵水稻植株发育过程的机制。水稻抽穗期相关E3泛素连接酶，抽穗期相关因子1（HAF1）被RSMV编码的P6劫持。HAF1功能的受损影响下游蛋白HEADING DATE 1和EARLY FLOWERING3的泛素化和降解，导致水稻抽穗延迟。

总之，本论文的研究结果为病毒和植物之间基于发育调控的分子相互作用提供了新的见解，并强调了了解病毒-昆虫介体-植物三方相互作用对有效的疾病管理策略的非常重要。

Rice stripe mosaic virus (RSMV) is an emerging pathogen which significantly reduces rice yields in the southern region of China. It is transmitted by the leafhopper Recilia dorsalis, which overwinters in rice fields. Our field investigations revealed that RSMV infection causes delayed rice heading, resulting in a large number of green diseased plants remaining in winter rice fields. This creates a favorable environment for leafhoppers and viruses to overwinter, potentially contributing to the rapid spread and epidemic of the disease. Next, we explored the mechanism by which RSMV manipulates the developmental processes of the rice plant. A rice heading-related E3 ubiquitin ligase, Heading date Associated Factor 1 (HAF1), was found to be hijacked by the RSMV-encoded P6. The impairment of HAF1 function affects the ubiquitination and degradation of downstream proteins, HEADING DATE 1 and EARLY FLOWERING3, leading to a delay in rice heading. Our results provide new insights into the development regulation-based molecular interactions between virus and plant, and highlights the importance of understanding virus-vector-plant tripartite interactions for effective disease management strategies.

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