TOKYO — The Bank of Japan said Friday that it would adopt a negative interest rate policy for the first time, as a sputtering economy, stubbornly low inflation and turbulent global financial markets threaten to undermine Prime Minister Shinzo Abe’s economic-revival plan.

The central bank said it cut the deposit rate it pays on cash parked at the BOJ by commercial banks in excess of legally required reserves, to minus 0.1% from the previous plus 0.1%. The goal was to push down borrowing costs across a broad time spectrum to stimulate inflation, the bank said.