Kanaklata is the elder daughter of Singh who died after a prolonged illness here in September.
Though she has no political experience, she was fielded as SP chief Mulayam Singh Yadav thought that Mohan Singh's legacy should continue, party leaders said.
Two Rajya Sabha seats from Uttar Pradesh fell vacant after the demise of Singh, and disqualification of Congress MP Rasheed Masood following his conviction in the MBBS seat scam.
The ruling party in Uttar Pradesh is yet to decide on the name of the second candidate.