The pitfalls of rDNA-based AMF identification: a comparative analysis of rDNA and protein-coding genes

IF 8.1 1区 生物学 Q1 PLANT SCIENCES
New Phytologist Pub Date : 2025-09-12 DOI:10.1111/nph.70557
Franck Stefani, Mario Laterrière, Lobna Abdellatif, Claudia Banchini, Greta Mader Stevens, Sylvie Séguin, Kasia Dadej, Lisa Koziol, Wendy Findlay, Yolande Dalpé
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引用次数: 0

Abstract

Abstract Image

基于rDNA的AMF鉴定的陷阱:rDNA和蛋白质编码基因的比较分析。
丛枝菌根真菌(arbuscular mycorrhizal fungi, AMF) rDNA的基因组内多态性在生态学和分类学研究中一直被忽视,rDNA核区用于物种鉴定的可靠性尚未得到全面评价,也未与蛋白质编码基因进行比较。对不规则根噬菌菌株的rDNA拷贝进行分析,发现菌株DAOM 197198的平均基因组内距离为0.08%(小亚基)~ 6.9%(内部转录间隔段2 (ITS2)),其中ITS1的最大基因组内距离为21.1%。基因组内rDNA多态性在AM真菌的系统发育中广泛存在,这一点已被来自44个物种的148个AM真菌培养物的单核苷酸多态性密度分析和PacBio测序所证实。在生态学和分类学研究中,所有常见的rDNA位点都是多态性的,其中ITS和大亚基是最可变的,这导致了副进化枝,并在密切相关的物种之间产生了误导性的系统发育解释。没有独特的遗传距离阈值可以用于识别AMF,因为所检查的蛋白质编码基因或部分rDNA都没有条形码间隙。然而,肾小球素的指示性距离阈值为1%,RPB1为1.1%,H+- atp酶为1.7%,为物种划分提供了指导。本研究描述了AMF基因组内rDNA多态性的程度,强调了高度可变位点带来的分类挑战,并描述了恢复rDNA拷贝的生物信息学管道。
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来源期刊
New Phytologist
New Phytologist 生物-植物科学
自引率
5.30%
发文量
728
期刊介绍: New Phytologist is an international electronic journal published 24 times a year. It is owned by the New Phytologist Foundation, a non-profit-making charitable organization dedicated to promoting plant science. The journal publishes excellent, novel, rigorous, and timely research and scholarship in plant science and its applications. The articles cover topics in five sections: Physiology & Development, Environment, Interaction, Evolution, and Transformative Plant Biotechnology. These sections encompass intracellular processes, global environmental change, and encourage cross-disciplinary approaches. The journal recognizes the use of techniques from molecular and cell biology, functional genomics, modeling, and system-based approaches in plant science. Abstracting and Indexing Information for New Phytologist includes Academic Search, AgBiotech News & Information, Agroforestry Abstracts, Biochemistry & Biophysics Citation Index, Botanical Pesticides, CAB Abstracts®, Environment Index, Global Health, and Plant Breeding Abstracts, and others.
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