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首页> 外文期刊>Plant Disease >Phytopythium litorale: A Novel Killer Pathogen of Plane (Platanus orientalis) Causing Canker Stain and Root and Collar Rot
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Phytopythium litorale: A Novel Killer Pathogen of Plane (Platanus orientalis) Causing Canker Stain and Root and Collar Rot

机译：PhytopyThium Litorale：平面（Platanus Orientalis）的新型杀手病原体，导致溃疡污渍和根和锁骨腐烂

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Decline symptoms associated with lethal stem and branch canker stain along with root and collar rots were observed on 5- to 7-year-old roadside oriental plane trees (Platanus orientalis) in Diyarbakir, Turkey. Aboveground symptoms included leaf necrosis, leaf curling, extensive bluish or blackish staining of shoots, branches, stem bark, and wood surfaces, as well as stem cankers and exfoliation of branch bark scales. A general decline of the trees was distinctly visible from a distance. A Phytophthora/Pythium-like oomycete species with globose to ovoid, often papillate and internally proliferating sporangia was consistently isolated from the fine and coarse roots and stained branch parts and shoots. The pathogen was identified as Phytopythium litorale based on several morphological features. Partial DNA sequences of three loci, including nuclear rDNA internal transcribed spacer (ITS) and the large ribosomal subunit (LSU), and mitochondrial cytochrome c oxidase subunit II (coxII) confirmed the morphological identification. All P. litorale isolates were homothallic, developing gametangia, ornamented oogonia with elongate to lobate antheridia. Pathogenicity of P. litorale was tested by inoculation on excised shoots and by root inoculation on seedlings. P. litorale produced large lesions and blights on shoots in just 5 days and killed 100% of the seedlings in a month. This paper presents the first confirmed report of P. litorale as an important pathogen on a plant species causing branch and stem cankers, and root and collar rot, in and on P. orientalis, resulting in a rapid decline of trees and suggesting a threat to plane.
机译：在土耳其Diyarbakir的5至7岁的路边东方平面树（Platanus Orientalis），观察到与致命杆和分支溃疡污渍相关的症状与致命的茎和分支溃疡污染与根和衣领腐蚀。地上症状包括叶坏死，叶片卷曲，广泛的蓝色或黑色染色的芽，分支机构，茎树皮和木材表面，以及茎溃疡和分支鳞片的剥离。从远处明显明显树木的一般下降。一种植物与卵泡的植物甾藻/钯样卵霉素，通常是乳头和内部增殖的Sporangia始终从细小的根部和粗糙的根部和染色的分支零件和芽中分离出来。基于几种形态特征，将病原体鉴定为植物特性。三个基因座的部分DNA序列，包括核RDNA内转录的间隔物（其）和大核糖体亚基（LSU）和线粒体细胞色素C氧化酶亚基II（COXII）证实了形态学鉴定。所有P. Litorale分离物都是HOMOTHALLIC，开发的GALETANGIA，装饰的卵黄糖蛋白，伸长，以露出植物瘤。通过接种切除的芽和幼苗的根部接种来测试P. Litorale的致病性。 P. Litorale在短短5天内产生了大病变和枝条上的枯萎，并在一个月内造成100％的幼苗。本文介绍了P. Litorale的第一个确认的报告，作为导致分支和茎溃疡的植物物种的重要病原体，根和锁骨腐烂，在P. Orientalis中，导致树木的快速下降并表明威胁飞机。

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