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A new desert-dwelling oomycete, Pustula persica sp. nov., on Gymnarrhena micrantha (Asteraceae) from Iran

The obligate biotrophic oomycete genus Pustula is one of the four major linages of white blister rusts ( Albuginaceae ) identified so far. Species of the genus Pustula cause white blister rust on numerous genera in the asterids, represented by several phylogenetically distinct genus-specific lineages, most of which still await formal description. Thus, the observation of the species of Pustula on the Asteraceae subfamily Gymnorhenoideae , pointed out to the existence of a hitherto undescribed species. By the morphological and molecular phylogenetic investigation conducted in this study it is concluded that the pathogen on Gymnarrhena micrantha from Iran indeed represents a hitherto unknown species and is described as P. persica . This species has apparently adapted to desert condition and is, after Albugo arenosa , the second species of white blister rust from Iranian deserts, highlighting the adaptability of white blister rusts to hot and dry habitats.