Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_27155678_2 ( accession_number VARCHAR, genus_species VARCHAR )

### Question ###
Name the accession number for rhodopseudomonas palustris

### Accurate SQL ###

SELECT accession_number FROM table_27155678_2 WHERE genus_species = "Rhodopseudomonas palustris"