APP下载

辣椒疫霉菌拮抗细菌L14-3的生防潜力及其鉴定

2021-02-25潘培培刘东平谢太震张忠良杜南山朴凤植申顺善

中国瓜菜 2021年1期

潘培培 刘东平 谢太震 张忠良 杜南山 朴凤植 申顺善

摘 要:为探讨L14-3菌株对辣椒疫病的生防潜力,采用皿内对峙试验和孢子萌发试验,测定其对辣椒疫霉菌的抑制活性,通过盆栽试验验证其对辣椒疫病的防治效果,并根据形态特征、生理生化特性和16S rDNA序列同源性分析对其进行鉴定。结果表明,L14-3菌株对辣椒疫霉菌的菌丝生长、游动孢子囊的形成、游动孢子的释放和休止孢子的萌发均具有显著的抑制作用;在盆栽试验中,L14-3处理对辣椒疫病的防治效果达到75.00%。经过鉴定,L14-3菌株为多黏类芽孢杆菌(Paenibacillus polymyxa)。

关键词:辣椒;多黏类芽孢杆菌;疫病;抑制活性;防治效果;鉴定

中图分类号:S641.3+S436 文献标志码:A 文章编号:1673-2871(2021)01-029-06

Biocontrol potential of antagonistic bacteria L14-3 against Phytophthora capsici and its identification

PAN Peipei1, LIU Dongping1, XIE Taizhen1, ZHANG Zhongliang1, DU Nanshan2, PIAO Fengzhi2, SHEN Shunshan1

(1. Henan New Pesticide Discovery Key Laboratory/College of Plant Protection, Henan Agricultural University, Zhengzhou 450002, Henan, China; 2. College of Horticulture, Henan Agricultural University, Zhengzhou 450002, Henan, China)

Abstract: In order to study the biocontrol potential of strain L14-3 against phytophthora blight of pepper, the antifungal activity of strain L14-3 against Phytophthora capsici were detected by in vitro and pot experiments. The results showed that, in vitro experiment, L14-3 was significant inhibit the mycelial growth, zoosporangium production, release and germination of zoospore of P. capsici. In the pot experiment, L14-3 performed the successful potential control against Phytophthora blight of pepper, the control efficiencies was 75.00%. In addition, based on the morphological,physiological characteristics and 16S rDNA sequence analysis, the strain L14-3 was identified as Paenibacillus polymyxa.

Key words: Pepper; Paenibacillus polymyxa; Phytophthora blight; Aantifungal activity; Control effect; Identification

辣椒疫病是由辣椒疫霉菌(Phytophthora capsici)引起的一种具有毁灭性的土传病害,在辣椒整个生育期均会发生。此病害发病速度快,传播范围广,给辣椒生产造成非常严重的损失[1]。近年来,不合理的轮作制度、水肥过度使用及品种抗病性差等因素,造成土壤中病原菌逐年积累,进而导致辣椒疫病的发生与流行。虽然目前已有多种防治方法,但是都存在着各种局限和不足。首先是现有的抗病品种单一,大多数抗病基因只能在一定的种、属之间表达,而几乎所有抗病品种都只对某一种或者少数几种致病微生物有抵抗能力;其次是土壤消毒的方法雖然简单、有效,但大多数只能局限于设施农业,在大田农业中很难实现,并且用化学药剂还会使病原菌产生抗药性,并对环境造成污染[2]。……

登录APP查看全文