GPR11, a putative seven-transmembrane G protein-coupled receptor, controls zoospore development and virulence of Phytophthora sojae.
G protein-coupled receptors (GPCRs) represent a large receptor family involved in a broad spectrum of cell signaling. To understand signaling mechanisms mediated by GPCRs in Phytophthora sojae, we identified and characterized the PsGPR11 gene, which encodes a putative seven-transmembrane GPCR. An expression analysis revealed that PsGPR11 was differentially expressed during asexual development. The highest expression level occurred in zoospores and was upregulated during early infection. PsGPR11-deficienct transformants were obtained by gene silencing strategies. Silenced transformants exhibited no differences in hyphal growth or morphology, sporangium production or size, or mating behavior. However, the release of zoospores from sporangia was severely impaired in the silenced transformants, and about 50% of the sporangia did not completely release their zoospores. Zoospore encystment and germination were also impaired, and zoospores of the transformants lost their pathogenicity to soybean. In addition, no interaction was observed between PsGPR11 and PsGPA1 with a conventional yeast two-hybrid assay, and the transcriptional levels of some genes which were identified as being negatively regulated by PsGPA1 were not clearly altered in PsGPR11-silenced mutants. These results suggest that PsGPR11-mediated signaling controls P. sojae zoospore development and virulence through the pathways independent of G protein.
Wang
Yonglin
Y
Department of Plant Pathology, Nanjing Agricultural University, Nanjing 210095, China.
Li
Aining
A
Wang
Xiaoli
X
Zhang
Xin
X
Zhao
Wei
W
Dou
Daolong
D
Zheng
Xiaobo
X
Wang
Yuanchao
Y
D020418:Algal Proteins / Q000235:genetics / Q000378:metabolism*; D000595:Amino Acid Sequence; D005786:Gene Expression Regulation; D020868:Gene Silencing; D008969:Molecular Sequence Data; D010838:Phytophthora / Q000254:growth & development* / Q000378:metabolism / Q000472:pathogenicity; D043562:Receptors, G-Protein-Coupled / Q000235:genetics / Q000378:metabolism*; D013025:Glycine max / Q000382:microbiology; D013170:Spores; D014774:Virulence
D020418:Algal Proteins; D043562:Receptors, G-Protein-Coupled; C450520:seven-transmembrane G-protein-coupled receptor