New Delhi: Poonam Sinha, wife of actor-turned-politician Shatrughan Sinha who recently joined the Samajwadi Party, is likely to file her nomination as Lok Sabha candidate from Lucknow on Thursday.

Sinha, who is the candidate fielded by the SP-BSP-RLD combine against BJP veteran Rajnath Singh in Lucknow, will first hold a road show beginning from Samajwadi Party office at 11 am. She is slated to file her nomination upon reaching the collectorate at around 1 pm.

She will be accompanied by Shatrughan Sinha, who recently joined the Congress and was made party candidate from Patna Sahib constituency in Bihar, and her actor-daughter Sonakshi Sinha, sources said, adding that Dimple Yadav will also join Sinha when she files her papers.

Rajnath Singh had won the Lucknow seat in 2014 garnering 55.7 per cent of the total 10,06,483 votes polled. Singh filed his nomination from the Lucknow Lok Sabha seat on Friday. Lucknow is going to polls on May 6 along with a total of 51 constituencies across seven states in the fifth phase of elections.

The Lucknow seat is with BJP since 1991 when Atal Bihari Vajpayee won. He broke his own record in 1996 by defeating Raj Babbar (SP) by a margin of 1,18,671 votes. In 1998, SP gave ticket to Muzaffar Ali, who also tasted defeat and Atal's victory margin rose to 2.16 lakh votes.

In 2014, when BJP gave ticket to Rajnath Singh he broke all records and won by a margin of 5,61,106 votes by defeating his nearest rival Congress candidate Rita Bahuguna Joshi (now in BJP).