Details

Autor(en) / Beteiligte

• Chen, Linlin
• Shen, Danyu
• Sun, Nannan
• Xu, Jing
• Wang, Wen
• Dou, Daolong

Titel

Phytophthora sojae TatD nuclease positively regulates sporulation and negatively regulates pathogenesis

Ist Teil von

• Molecular plant-microbe interactions, 2014-10, Vol.27 (10), p.1070-1080

Ort / Verlag

United States: The American Phytopathological Society

Erscheinungsjahr

2014

Quelle

MEDLINE

Beschreibungen/Notizen

• During pathogenic interactions, both the host and pathogen are exposed to conditions that induce programmed cell death (PCD). Certain aspects of PCD have been recently examined in eukaryotic microbes but not in oomycetes. Here, we identified conserved TatD proteins in Phytophthora sojae; the proteins are key components of DNA degradation in apoptosis. We selected PsTatD4 for further investigation because the enzyme is unique to the oomycete branch of the phylogenetic tree. The purified protein exhibited DNase activity in vitro. Its expression was upregulated in sporangia and later infective stages but downregulated in cysts and during early infection. Functional analysis revealed that the gene was required for sporulation and zoospore production, and the expression levels were associated with the numbers of hydrogen-peroxide-induced terminal dUTP nick end-labeling-positive cells. Furthermore, overexpression of PsTatD4 gene reduced the virulence in a susceptible soybean cultivar. Together, these data suggest that apoptosis may play different roles in the early and late infective stages of P. sojae, and that PsTatD4 is a key regulator of infection. The association of PsTatD4 and apoptosis will lay a foundation to understanding the basic biology of apoptosis and its roles in P. sojae disease cycle.