CREATE TABLE table_27155678_2 (accession_number VARCHAR2, genus_species VARCHAR2)

Name the accession number for rhodopseudomonas palustris
SELECT accession_number FROM table_27155678_2 WHERE genus_species = "Rhodopseudomonas palustris"
SELECT "accession_number" FROM "table_27155678_2" WHERE "Rhodopseudomonas palustris" = "genus_species"