Under cleisthenes reforms who could participate in Athenian government

Answer: Only male property owners born in Athens

Explanation: If it's for a quiz, then this is the answer.

Answer: The reforms of Cleisthenes In 508, after a short period of old-fashioned aristocratic party struggles, the Athenian state was comprehensively reformed by Cleisthenes, whom Herodotus calls "the man who introduced the tribes and the democracy," in that order. The order is important.