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Abstract
Sensing chemical signal secreted from host root and find the best site for penetration are crucial for initiating infection of Phytophthora zoospore. G protein α subunit of P. sojae participates in not only the chemotaxis to soybean isoflavone, but also finding penetrating site. Further more, although calcium signal pathway has been proven to be influenced by Gα, other signal pathways which are also influenced by G protein are need to be find out. In this addendum, we describe an RGS protein, PsRGS6, is expressed downregulated in zoospores of Gα silenced mutant. This result indicates that the expression of Gα and RGS protein may be influenced by each other. Some differences between Gα mutants of P. infestans and P. sojae may be due to the different developmental procedures.