If the deal goes through the new €75bn global entity could be split in three: agricultural chemicals, specialty products, and materials – according to press reports.
Shares in both firms have risen as a result of the proposal. Both companies have refused to comment on the speculation.
DuPont paid $6.3 bn (€5.75bn) for Danisco in 2011.
The US-based giant took full control of Solae from its partner Bunge in 2012.