Bayer (BAYN.XE) has talked about strategic rationale for buying biotech-seed giant Monsanto (MON) in terms of decades and a growing global population. But MON's expectation for lower FY profit in seeds (the company now sees gross profit falling nearly 5% versus being flat previously) "may impact a potential buyer's view," says Citi. Bayer's $ 62B bid outlined in May will likely support MON shares anyway for the time being, but the investment bank says DuPont (DD), another top seed manufacturer, could face some of the same growing challenges in the sector.