Cross-kingdom RNAi induced by a beneficial endophytic fungus to its host requires transitivity and amplification of silencing signals

IF 3.6 3区 生物学 Q1 PLANT SCIENCES
Plant Biology Pub Date : 2025-05-16 DOI:10.1111/plb.70026
L. M. Kellari, A. Dalakouras, O. Tsiouri, P. Vletsos, A. Katsaouni, V. V. Uslu, K. K. Papadopoulou
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Abstract

Abstract Image

有益内生真菌诱导宿主的跨界RNAi需要沉默信号的传递性和放大性。
小RNA (sRNA)分子的跨界转移已被确定为植物和相互作用的微生物之间的一种交流手段,但这种基于sRNA的相互作用的机制细节仍然难以捉摸。我们之前已经证明,有益的根定殖真菌枯萎菌K (Fusarium solani strain K, FsK)会将sRNAs转移到它的宿主Nicotiana benthamiana (Nb)身上,导致一个报告基因的系统性沉默。在这里,我们使用RNAi传感器系统研究了内生菌诱导的系统沉默的机制细节。我们用含有靶向宿主GFP (FsK- hpgf)的转基因的FsK转化的分生孢子接种了3株Nb GFP表达系。FsK-hpGF介导的沉默效率在紫外光和定量RT-qPCR下进行了表型监测。进行sRNA测序以评估靶向宿主GFP的sRNA的产生。最后,亚硫酸盐测序用于评估植物GFP甲基化水平。我们发现,易位的真菌sRNAs诱导了次要sRNAs的产生,主要是22-24-nt大小的sRNAs,而21-nt sRNAs的明显缺失。重要的是,在RNA依赖性RNA聚合酶6 (RDR6) CRISPR/Cas敲除背景下,也不能在含内含子的靶基因中诱导系统沉默。总的来说,我们的数据表明,宿主内生菌诱导的沉默需要rdr6介导的沉默信号的传递性和放大。尽管基于人工RNAi传感器系统,但我们的观察结果可能反映了跨界RNAi的一个更普遍和迄今未被探索的方面,即基于rdr6的传递性影响共生体和病原体在其寄主植物中引发系统表型的方式。
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来源期刊
Plant Biology
Plant Biology 生物-植物科学
CiteScore
8.20
自引率
2.60%
发文量
109
审稿时长
3 months
期刊介绍: Plant Biology is an international journal of broad scope bringing together the different subdisciplines, such as physiology, molecular biology, cell biology, development, genetics, systematics, ecology, evolution, ecophysiology, plant-microbe interactions, and mycology. Plant Biology publishes original problem-oriented full-length research papers, short research papers, and review articles. Discussion of hot topics and provocative opinion articles are published under the heading Acute Views. From a multidisciplinary perspective, Plant Biology will provide a platform for publication, information and debate, encompassing all areas which fall within the scope of plant science.
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