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Related Experiment Video

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On-Site Molecular Detection of Soil-Borne Phytopathogens Using a Portable Real-Time PCR System

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Published on: February 23, 2018

Pythium abappressorium--a new species from eastern Washington.

Timothy C Paulitz¹, Karen Adams, Mark Mazzola

¹USDA-ARS, Root Disease and Biocontrol Laboratory, 365 Johnson Hall, Washington State University, Pullman, Washington 99164-6430.

|December 16, 2010

Summary

A novel Pythium species, Pythium abappressorium, was identified in Washington wheat and apple roots. This fungus causes disease in wheat but not apples, and its unique genetic sequence indicates it is a new species.

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Published on: February 9, 2019

Area of Science:

Mycology
Plant Pathology
Fungal Taxonomy

Background:

Root-infecting oomycetes pose significant threats to agriculture.
Accurate identification of fungal species is crucial for effective disease management.

Purpose of the Study:

To describe a newly discovered species of Pythium isolated from wheat and apple roots.
To characterize the morphology, pathogenicity, and genetic distinctiveness of this new species.

Main Methods:

Isolation and culturing of the fungus from infected plant roots.
Microscopic examination for morphological characterization, focusing on appressoria and oospore formation.
Pathogenicity tests on wheat and apple seedlings.
Molecular analysis using the ITS1 region of the rDNA for phylogenetic comparison.

Main Results:

A new species, Pythium abappressorium sp. nov., is described, characterized by abundant appressoria with attached remnants.
The fungus is pathogenic to wheat, causing damping-off and stunting, but not to apples.
Optimal growth occurs between 5-30°C, with an optimum of 20°C.
ITS1 rDNA sequence analysis revealed no match with over 1200 existing Pythium isolates, confirming its novelty.

Conclusions:

Pythium abappressorium represents a previously undescribed species of oomycete.
Its pathogenicity to wheat highlights its potential agricultural significance.
The distinct morphological and genetic features warrant its classification as a new species.