辣椒种子中拮抗青枯病菌内生细菌的促生功能分析
2020-08-09牟玉梅李菲范高领邢丹蓬桂华
牟玉梅 李菲 范高领 邢丹 蓬桂华



摘 要:以拮抗青枯病菌的辣椒种子内生细菌为对象,研究并了解其促生功能多样性、促生效应等,为辣椒种子内生细菌的开发利用提供理论支撑。测定了6株内生细菌的多样化生物学功能,进行种子催芽和盆栽促生试验。结果表明,产IAA、溶磷、固氮、产嗜铁素是供试菌株中普遍具备的功能,6株内生细菌中有5株具有3种及3种以上的促生功能。所有内生细菌菌悬液均能显著地促进辣椒种子萌发和植株生长,增强种子活力,提高壮苗指数,具有较好的促生效果。辣椒种子内生菌菌株对辣椒具有较好的防病促生效果,具有开发微生物农药和菌肥的巨大潜力。
关键词:辣椒种子;内生细菌;拮抗作用;功能多样性
中图分类号:S633.3 文献标志码:A 文章编号:1673-2871(2020)07-056-05
Abstract:This experiment is to study and understand the function diversity and effect of cayenne pepper seed endophytic bacteria, which antagonizes cayenne pepper seed, and providing theoretical support for the development and utilization of endophytic bacteria in pepper seeds. The biological functions of 6 endogenous bacteria were determined by seed germination and plant growth in pot. IAA production, phosphorus dissolution, nitrogen fixation, and ferrophilic production are a common function of the tested strains. Five of the six endogenous bacteria have three or more probiotic functions. All endogenous bacterial suspensions can significantly promote the seed germination and growth of pepper, enhance the seed vitality, and improve the seedling index, which has a good effect of promoting growth. Endophytic bacterial strains of pepper seeds have good disease control and growth promotion effects on pepper, and have great potential to be developed as microbial pesticides and bacterial fertilizer.
Key words: Pepper seeds; Endophytic bacteria; Antagonistic effect; Functional diversity
内生菌是一类生活在植物体内且对植物无明显不利影响的微生物的总称[1]。植物内生菌的生物多样性十分丰富,其在自然选择条件下会产生与宿主植株相同或相似的生理生化活性物质[2],通过合成植物激素、产生铁载体、生物固氮等多种方式促进宿主种子萌发和植物生长,协助宿主植物抵御病原菌及不良的生长环境[3-4]。已有研究发现,内生菌除具有生防功能多样性外,还兼有一定的促生效果。程亮[5]从矮火绒草植株根、茎、叶和种子部位分离获得52株内生细菌,发现其中11株有拮抗病原真菌能力、9株有产IAA能力、7株有溶磷活性、7株有固氮活性、20株有除草活性、13株有耐低温能力和8株有促生作用。……
