Rules concerning political donations will be put in place following a wave of embarrassing media coverage, including Daily Express owner Richard Desmond's £100,000 gift to the Labour Party revealed last week.
APPC members will now be required to advise clients of the need for transparency when giving donations.
APPC executive member and outgoing chairman Michael Burrell said: 'What happened with Desmond looked worse because there was a perception that there wasn't as much openness as there should have been.'
The APPC has also extended its so-called Drapergate clause, which bans exaggerated claims of government influence, to include claims over political parties.
Also at the APPC's AGM this week, Citigate Public Affairs MD Warwick Smith was confirmed as chairman, replacing Burrell, who had come to the end of his three-year term.
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