玉米茎腐病病原菌致病机制及防控技术研究进展

    Progress on Pathogenic Mechanism and Control Technology of Maize Stalk Rot Pathogen

    • 摘要: 玉米茎腐病(Maize stalk rot)是一种由病原真菌引起的侵染性病害, 在我国15个省份地区和5大玉米产区均有发生, 且在欧洲、美洲、东南亚等区域也均有危害报道, 其为害率也呈逐年加重趋势。玉米茎腐病为害可使玉米减产约10%, 严重时可减产50% 以上。基于玉米茎腐病国内外研究成果, 该文总结玉米茎腐病的病原菌种类、侵染方式、致病机制、防控技术等研究现状。玉米茎腐病可分为8种类型, 即赤霉茎腐病、镰孢茎腐病、腐霉茎腐病、炭疽茎腐病、炭腐茎腐病、色二孢茎腐病、球二孢茎腐病和细菌性茎腐病; 我国玉米茎腐病病原菌主要有禾谷镰孢、层出镰孢、拟轮枝镰孢、腐霉等, 且在不同玉米种植地区优势病原菌种类也存在差异。病原菌菌丝侵染方式主要为通过伤口或自然孔口进入玉米茎秆节间。其致病机制为, 病原菌分泌一系列能破坏寄主植物细胞壁的毒力因子, 如毒素、细胞壁降解酶, 使病原菌顺利进入寄主细胞内并大量生长繁殖, 破坏寄主植物组织, 从而导致玉米内茎髓部腐烂坏死, 最终整株于茎部折断或枯死。该文还阐述国内外防治玉米茎腐病的综合防控技术, 包括抗病品种选育、化学药剂防治、田间农业措施管理、生防菌生物防治等。目前玉米茎腐病防控难度仍较大, 要秉行“预防为主, 综合防治”的植保方针, 加强玉米茎腐病病原菌监测, 继续深入系统研究病原菌致病机理, 强化生物防治技术, 研发高效低毒低残留农药应急防控产品, 积极开展生态种植模式研究, 保障玉米安全高效生产。

       

      Abstract: Maize stalk rot is an infectious disease triggered by pathogenic fungi. It emerges in 15 provinces and regions as well as five major maize-producing areas in China. Maize stalk rot has also been documented in Europe, America and Southeast Asia, with its prevalence on the rise. Maize stalk rot can lead to a reduction of approximately 10% in maize yield, and over 50% in severe cases. Based on the research findings of maize stalk rot both at home and abroad, this paper summarizes the research status regarding pathogen species, infection mode, pathogenic mechanism, and prevention and control technology of maize stalk rot. The pathogens of maize stalk rot can be classified into 8 types, namely, Gibberella stalk rot, Fusarium stalk rot, Pythium stalk rot, Anthracnose stalk rot, Charcoal stalk rot, Botryodiplodia stalk rot, Diplodia stalk rot and bacterial stalk rot. The main pathogens of maize stalk rot in China are Fusarium graminearum, Fusarium verticillioides, Fusarium proliferatum, and Pythium sp.. There are variations in the dominant pathogens in different maize planting areas. The primary mode of infection of the pathogenic fungus mycelium is to penetrate the internodes of the corn stalk via wounds or natural pores. Its pathogenic mechanism involves the pathogen secreting a series of virulence factors, such as toxins and cell wall-degrading enzymes, which can damage the cell wall of the host plant. Thus, pathogenic fungi can successfully invade the host cells and multiply in large quantities, destroying the host plant tissues and leading to the decay and necrosis of the inner stem and medulla of maize, and eventually causing the entire plant to break or wilt. Additionally, the comprehensive prevention and control techniques of maize stalk rot both at home and abroad were described, including breeding resistant varieties, chemical control, field agricultural management, biocontrol bacteria and biological control, etc. Currently, the prevention and control of maize stalk rot remains challenging. It is necessary to adhere to the plant protection policy of "prevention first, comprehensive prevention and control", strengthen the monitoring of maize stalk rot pathogens, continuously and systematically study the pathogenic mechanism of the pathogens, enhance biological control technology, develop emergency control products with high efficiency, low toxicity and low residue pesticides, and actively conduct research on the ecological planting mode to ensure the safe and efficient production of corn.