Monsanto is considering fresh acquisitions in the agrichemicals sector, and still has its eye on Syngenta, executives told investors.
Meanwhile, Syngenta's chairman, Michel Demare, which earlier this year rebuffed a $45bn takeover bid from Monsanto, a said that he was "convinced" that the next six months would bring a shake-up of the industry.
Monsanto president Brett Begemann said on Tuesday that, even after Syngenta's rejection - which was ill received by many of the Swiss group's investors - "we've had conversations inside" about a further pursuit of the company, or indeed and other agribusinesses.
Mr Begemann said Monsanto is in the market for agrichemical acquisitions in particular, potentially for business spun-out as a result of industry mergers.
Hugh Grant, the Monsanto chief executive, said that the group, the world's largest seed company, was "best placed to be a leading consolidator or a leading partner in an industry that is changing".
The environment in the agricultural chemical sector has grown increasingly febrile, against a background of low grain prices and strained farmer budgets, as discussion around takeover bids proliferates.
Agricultural input companies are smarting from reduced farmer incomes, with US operators particularly hard hit, due to the strengthening dollar which has eaten into foreign currency-denominated revenues.
And Syngenta in particular has found itself the centre of takeover attention.
As well as the Monsanto offer, the third such bid this year, the Swiss agribusiness last week rejected at $42bn offer from the Chinese state-owned China National Chemical Corp.
German chemical group BASF is reported to have sought financing for a Syngenta takeover earlier this year.
And the Wall Street Journal has carried reports that Syngenta was in takeover discussions with Dupont.
Syngenta's chief executive Mike Mack stepped down last month, in the wake of the rejected Monsanto bid.
The rebuff, which was down to the Syngenta board rather than Mr Mack, sent the company's shares sharply downward.
In an interview with the Financial Times on Wednesday, Syngenta chairman Michel Demare said that merger and acquisition conversations in the industry were "extremely active".
"This is the result of the Monsanto approach for Syngenta, which for sure has shaken the whole industry ... It has created the huge activity in which everyone is speaking to each other," Mr Demare said.
"We are all convinced that [the sector] will look quite different in six months."
'Everyone is talking to everyone'
Meanwhile, DuPont has also been in talks with Dow Chemicals, over the possibility of acquiring the group's seed and ag-chemical division.
"Everyone is talking to everyone," the boss of Dow Chemical told investors last month,
Last week, Kerry Preete, Monsanto's vice-president of global strategy, told investors that consolidation in the sector was "inevitable," citing economies of scale in research and development.
But on Wednesday the German drugs and pesticides maker Bayer restated its commitment to keep hold of its crop chemicals business amid the feeding frenzy.
A Bayer spokesman said that the group's CropScience unit was an "integral part" of the group.
By William Clarke