Option 1: M.S. Swaminathan was associated with the wheat hybridization program in India. He is an Indian geneticist and agricultural scientist who played a crucial role in India`s Green Revolution. He is known as the "Father of the Green Revolution in India" and made significant contributions to wheat hybridization.

Option 2: Panchanan Maheshwari was not associated with the wheat hybridization program in India. He was an eminent Indian botanist and plant cytologist, but his work was mainly focused on plant reproductive biology, cell biology, and embryology.

Option 3: Choudhary Ram Dhan Singh is associated with the wheat hybridization program in India. He is an Indian agricultural scientist and played a pivotal role in the development and spread of dwarf wheat varieties, which revolutionized wheat production in India.

Option 4: Norman E. Borlaug, an American agricultural scientist, was associated with the wheat hybridization program in India. He is often referred to as the "Father of the Green Revolution" and received the Nobel Peace Prize for his contributions to crop improvement and food production.

In summary, the correct answer is option 2, Panchanan Maheshwari, as he was not associated with the wheat hybridization