A new species ofPythiumisolated from a vineyard in France

Abstract

Pythium apiculatum sp. nov. is a new oomycete characterized by the presence of both ornamented and smooth-walled oogonia. The ornamentations are blunt, and at times, bent. The oomycete was isolated from soil samples taken in a vineyard in the Burgundian region of France. Morphologically, it resembles some species having ornamented oogonia like Pythium radiosum, Pythium echinulatum, and resembles, also the species having smooth-walled oogonia like Pythium hypogynum and Pythium acrogynum. However, the oomycete has its own distinguishing characteristics which, when combined with molecular features, enables us to describe it as a new species. The taxonomic description of this new oomycete, its comparison with related species, and the sequence of the ITS region of its rRNA gene, are described in this article.

Long-Term Tillage and Crop Rotation Regimes Reshape Soil-Borne Oomycete Communities in Soybean, Corn, and Wheat Production Systems

“…under reduced tillage [58,59]. Conversely, G. apiculatum was more abundant under CT and rarely present under NT, although this species is not a confirmed pathogen [60]. G. ultimum, another species with higher abundance under CT, particularly in soybean monoculture (Figure 3A), has been reported as a highly damaging pathogen for corn and soybean seeds and seedlings [32,33,38,61].…”

Long-Term Tillage and Crop Rotation Regimes Reshape Soil-Borne Oomycete Communities in Soybean, Corn, and Wheat Production Systems

“…under reduced tillage [ 58 , 59 ]. Conversely, G. apiculatum was more abundant under CT and rarely present under NT, although this species is not a confirmed pathogen [ 60 ]. G. ultimum , another species with higher abundance under CT, particularly in soybean monoculture ( Figure 3 A), has been reported as a highly damaging pathogen for corn and soybean seeds and seedlings [ 32 , 33 , 38 , 61 ].…”

Phylogeny of the genus <i>Pythium</i> and description of new genera

“…Consequently, the distribution, ecological roles, and physiological features of the species have not been sufficiently elucidated. Recently, many new Pythium species have been described based on strains isolated from uncultivated fields or seminatural environments in several countries (Nechwatal and Oßwald 2003;Allain-Boule ´et al 2004;Nechwatal et al 2005;Nechwatal and Mendgen 2006;Paul 2006;Belbahri et al 2008;de Cock et al 2008;Moralejo et al 2008;Paul and Bala 2008;Uzuhashi et al 2009). This suggests that more unidentified species exist in soils of uncultivated fields, and thus a survey of Pythium species is warranted.…”