The governor of Germany's Rhineland-Palatinate state Kurt Beck said Friday he is skeptical about plans by Fiat SpA (F.MI) to take over General Motors Corp.'s (GM) German unit Adam Opel AG.

Beck made the remarks after meeting with Fiat Chief Executive Sergio Marchionne earlier Friday.

"From a German view, and from the view of Rhineland-Palatinate, questions about the plan loom even larger after the discussion," Beck said.

"The state government has deep concern about a plan which doesn't include the independent production of engines in Germany," Beck added, with a view to Fiat's plan to close motor component production in Kaiserslautern. Beck said his government supports all four of Opel's German sites.

The state government will review all other offers the same way, hoping to make a decision as soon as possible, Beck said.

Separately, news agency ddp reported Marchionne saying he hopes for a decision on the purchase of Adam Opel AG by the end of this month.

"I hope that we're in a position to find a solution before U.S. President Barack Obama's deadline," he added.

Obama has given Opel parent company GM a deadline of June 1 to come up with a restructuring plan.

Discussions with Hesse state governor Roland Koch and Governor Beck went well, Marchionne added, according to the report.

-By Katharina Becker, Dow Jones Newswires; +49 (0)69 29725 112; katharina.becker@dowjones.com