San Diego also optioned left-handed reliever Joe Thatcher to Portland. He was recalled on Tuesday when pitcher Jake Peavy went on the disabled list.
The Padres needed to fill the roster spots of pitcher Chris Young and catcher Josh Bard who were placed on the 15-day disabled list prior to Thursday's game at PETCO Park against the Reds.
Young suffered a nasal fracture and a lacerated nose when he was hit in the face by a line drive off the bat of Albert Pujols in the third inning of Wednesday's 11-3 loss to the Cardinals.
Bard suffered a high left ankle sprain in the same inning on a play at the plate involving a sliding Pujols. Bard had an MRI on Thursday. He's expected to miss between four and six weeks, manager Bud Black said.
Wells was 1-1 with a 5.85 ERA with nine saves for the Beavers. Adams was 3-1 with a 5.52 ERA. He is the only player who was not on the 40-man roster meaning the Padres had to purchase his contract from Portland.
Banks was 1-1 with a 6.66 ERA in eight games with the Beavers. He could fill Young's spot in the rotation should they need it. Young's spot in the rotation comes again on an off-day (May 26) meaning the Padres wouldn't need to address that spot until May 31.
Banks allowed one run in six innings with eight strikeouts in his last start for Portland on May 19. He was claimed off waivers from the Blue Jays on April 23.
This will be Morton's second stint with the Padres this season. He had one during a 15 at-bat stint in nine games after catcher Michael Barrett was placed on the disabled list with a sprained right elbow.
The Padres did consider activating Barrett from the disabled list after three rehabilitation stints with Portland but opted to let him play on Friday for nearby Class A Lake Elsinore before making a decision to activate him if need be.
"I don't think Michael is far away," Black said. "We can pull Michael at any time that we deem he's ready."
As for Germano, Black said that the right-hander's lack of fastball command was what caused him so many problems this season when he went 0-3 with a 5.98 ERA after starting the season with 13 scoreless innings. He was later taken out of the rotation.
"I don't think it's any one thing," Black said. "Looking at it from the baseball side, the command of his fastball wasn't as sharp as it was early in the year. With Justin it comes down to location.
"Coming up like he did last season, reeling off five straight wins when we needed it. He helped us to get where we were last year, in a pennant race and a chance to grab a playoff spot."