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Issue: Vol. 289 No. 1: 20 December 2016
Type: Article
Published: 2016-12-20
DOI: 10.11646/phytotaxa.289.1.7
Page range: 83–87
Abstract views: 20
PDF downloaded: 1

Pustula junggarensis (Albuginales, Oomycota), a new species of white blister rust on Takhtajaniantha pusilla from Junggar Basin in China

Department of Plant Pathology/Guangdong Province Key Laboratory of Microbial Signals and Disease Control, South China Agricultural University, Guangzhou, 510624, China College of Life Sciences, Tarim University, Aral, 843300, China
College of Life Sciences, Tarim University, Aral, 843300, China
Department of Plant Pathology/Guangdong Province Key Laboratory of Microbial Signals and Disease Control, South China Agricultural University, Guangzhou, 510624, China
Department of Plant Pathology/Guangdong Province Key Laboratory of Microbial Signals and Disease Control, South China Agricultural University, Guangzhou, 510624, China
Fungi Albuginales Asteraceae ephemeral plant taxonomy white blister rust

Abstract

An unknown white blister rust was collected on Takhtajaniantha pusilla (Pall.) Nazarovain (Asteraceae) in the desert regions of Junggar Basin in China. The pathogen is characterized by depressed primary sporangia,subglobose secondary sporangia with annulus, yellowish to dark reddish-brown oospores, (45.4)54.6–65.4(68.5) µm in diameter, with inner walls on average up to 2.7 µm thick and outer wall on average up to 5.2 µm thick, which is obviously larger than in the morphologically similar P. obtusata and P. helianthicola. Phylogenetic analyses based on cox2 mtDNA sequences provided the evidence that this pathogen is separated from other species of Pustula and forms a distinct lineage. Therefore, we consider this pathogen as a new species of Pustula, described here as Pustula junggarensis.