Alton Carter, 89, President Carter's uncle and the former mayor of Plains, Ga., died Wednesday at the Americus-Sumter County Hospital in Americus, Ga.

He had undergone gall bladder surgery on Jan. 8 and had been in intensive care since then.

Funeral services will be held at 11 a.m. Saturday in the Maranatha Baptist Church near Plains.

President Carter, who will be in Atlanta tonight for a fund-raising dinner, will atend the services. He was described as being "very close" to his uncle.

Alton Carter was born in Arlington, Ga. When he was 15 years old, he moved his mother, two sisters, and his younger brother, James Earl Carter, father of the President, to Plains from Rowens, Ga.

James Earl Carter died in 1953, and Alton, according to members of the family, became somewhat like a second father to President Carter.

Alton Carter was mayor of Plains, the President's hometown, for 28 years, and a Sumter County commissioner for seven years.

He operated a general store in Plains from 1909 until 1971.He continued to work with his son, State Sen. Hugh Carter, in the Carter Antique Shop in Plains until he became ill.

Also surviving are his wife, Betty Jennings Carter; another son, Don, who is a vice president of Knight-Ridder Newspapers in Miami; two sisters, Lula Fleming, of Birmingham, Ala., and Jeanette Lowery, of Tallahassee, Fla., three grandchildren and three great-grandchildren.