Khandu, who had replaced Nabam Tuki following a dissident campaign in July, paraded 42 MLAs before Assembly Speaker Tenzing Norbu Thongdok, who accepted their joining the PPA, Assembly sources said.
The merger would be notified in the Assembly bulletin, formalising the political development that leaves Congress with governments only in Manipur, Meghalaya and Mizoram in the northeast.
The dramatic development in Arunachal Pradesh brought back memories of the famous 'aya ram, gaya ram' episode involving Bhajan Lal who was heading a Janata Party government in Haryana and defected lock, stock, and barrel with all the party MLAs to the Congress after Indira Gandhi came back to power in 1980.
Khandu on July 16 had become the chief minister after months of political turmoil that unseated Tuki, who himself was reinstated as chief minister by the apex court only two days before.
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In a House of 60, the Congress had 44 MLAs with one seat falling vacant after former chief minister Kalikho Pul committed suicide on August 9, while the BJP has 11 members including two Independents.
The status of two Congress MLAs is yet to be decided as they put in their papers before the recent series of political developments that led to first Tuki government falling in January this year, imposition of President's rule and installation of the late Kalikho Pul government on February 19 for a short span.
Asked for the reasons behind the development, Deputy
Chief Minister Chowna Mein said that for a resource-starved state like Arunachal, it is necessary to be with a bigger party to get more development funds from the Centre.
However, Tuki, who was out of the station, could not be contacted for his comments.
The PPA had ruled the state for a brief period from March 3 to July 13 this year under late Pul. Earlier the PPA had formed the government in 1979 when Tomo Riba was the chief minister.
Meanwhile, state BJP President Tapir Gao, while welcoming Khandu's move, stated that the decision should have been taken earlier.
"We are happy that Prime Minister Narendra Modi's dream of a 'Congress-mukt Bharat' is becoming a reality now," Gao said.
While blaming the Congress high command for the mess in the party, Gao said party president Sonia Gandhi and Vice President Rahul Gandhi should have taken care of this.
Asked about the possibility of PPA MLAs merging with the BJP, Gao said the party's door was open.