利用拮抗菌防治由 Alternaria tenuissima 引起的马铃薯褐叶斑病以及病害发展过程中植物相关的生化变化

IF 2.3 3区 农林科学 Q1 AGRONOMY
Ebrahim Salari, Sareh Baghaee-Ravari
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引用次数: 0

摘要

在伊朗的马铃薯田里,由 Alternaria tenuissima 引起的褐叶斑病发病率呈上升趋势。褐叶斑病造成的经济损失和常用杀真菌剂之间的交叉抗药性促使研究人员寻找替代的生物防治源,以结合化学药剂来控制这种侵袭性病原体。在对 A. tenuissima 生长有抑制作用的细菌分离物中,所测试的生物防治特性和植物生长促进(PGP)特性各不相同。最终选择了三株具有抗真菌特性的菌株和一株具有 PGP 能力的菌株进行进一步的体外和体内实验。结合表型特征和 16S rRNA 测序,它们分别被鉴定为卤化芽孢杆菌(Bacillus halotolerans)-H14、芽孢杆菌(Bacillus sp.)-H52、多肉沙雷氏菌(Serratia polymuthica)-FR1 和臭单胞菌(Stenotrophomonas sp.)-J29。在与上述细菌菌株的共培养试验中,观察到它们会诱导 A. tenuissima 的菌丝结构变形并抑制孢子萌发。对疾病症状的监测表明,在体内挑战实验中,H14、FR1 和 J29 能够降低疾病的严重程度。此外,还研究了上述细菌在激活马铃薯防御 A. tenuissima 途径中的作用。在 Solanum tuberosum-A. tenuissima 相互作用期间,用 Stenotrophomonas sp.J29 和 Serratia plymuthica-FR 预处理后再接种 A. tenuissima 的马铃薯植株中,苯胺氨解酶活性和总酚类物质的积累显著增加。这项研究提供了初步证据,证明了卤化芽孢杆菌、十字花科沙雷氏菌和 Stenotrophomonas sp.在马铃薯-A. tenuissima 相互作用中作为病害发展抑制剂和抗性生物诱导剂的潜在作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Utilization of Antagonistic Bacteria for Managing Potato Brown Leaf Spot Caused by Alternaria tenuissima and Plant-Associated Biochemical Changes During Disease Development

Utilization of Antagonistic Bacteria for Managing Potato Brown Leaf Spot Caused by Alternaria tenuissima and Plant-Associated Biochemical Changes During Disease Development

The incidence of brown leaf spot, attributed to Alternaria tenuissima, has exhibited an increase within potato fields in Iran. The economic losses caused by brown leaf spot and detection of cross-resistance among commonly used fungicides have incited research towards identifying alternative biocontrol sources to manage this aggressive pathogen in combination with chemicals. Among bacterial isolates that showed inhibition of A. tenuissima growth, the tested biocontrol properties and plant growth-promoting (PGP) characteristics varied. Three strains with antifungal traits and one strain with PGP capacity were chosen for further in vitro and in vivo experiments. They were identified as Bacillus halotolerans-H14, Bacillus sp.-H52, Serratia polymuthica-FR1, and Stenotrophomonas sp.-J29, respectively, using a combination of phenotypic traits and 16S rRNA sequencing. In co-culturing assays with the aforementioned bacterial strains, it was observed that they induced hyphal structural deformation and suppressed spore germination of A. tenuissima. Monitoring of the disease symptoms showed the ability of H14, FR1, and J29 to decrease disease severity under in vivo challenge experiments. Moreover, the role of aforementioned bacteria was studied in activation of potato defence pathways against A. tenuissima. During Solanum tuberosum-A. tenuissima interaction, biochemical attributes related to defence response such as superoxide and hydrogen peroxide production, redox enzymes (catalase, superoxide dismutase, ascorbate peroxidase, and guaiacol peroxidase), phenylalanine ammonia-lyase activity, and accumulation of total phenolics were markedly increased in potato plants pre-treated with Stenotrophomonas sp.-J29 and Serratia plymuthica-FR and post-inoculated with A. tenuissima. This study provides the initial evidence demonstrating the potential role of Bacillus halotolerans, Serratia plymuthica, and Stenotrophomonas sp. as prohibitor of disease progression as well as biological inducer of resistance in potato—A. tenuissima interplay.

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来源期刊
Potato Research
Potato Research AGRONOMY-
CiteScore
5.50
自引率
6.90%
发文量
66
审稿时长
>12 weeks
期刊介绍: Potato Research, the journal of the European Association for Potato Research (EAPR), promotes the exchange of information on all aspects of this fast-evolving global industry. It offers the latest developments in innovative research to scientists active in potato research. The journal includes authoritative coverage of new scientific developments, publishing original research and review papers on such topics as: Molecular sciences; Breeding; Physiology; Pathology; Nematology; Virology; Agronomy; Engineering and Utilization.
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