DENVER -- "Alabama" showed up big on Thursday.

That, of course, is how former Crimson Tide wide receiver DeAndrew White has come to be known. The San Francisco 49ers undrafted rookie was a standout during the team's final joint practice with the Denver Broncos from the UCHealth Training Center on Thursday. 

White was featured in both of the offense's two biggest plays, hauling in deep passes from both Colin Kaepernick and Blaine Gabbert.

The first came from Gabbert. During one of the first team periods, the 49ers backup quarterback sold a play-action fake and the offensive line gave him plenty of time in the pocket. Gabbert then found White streaking down the field from right to left and hit his receiver in stride. 

It wasn't a "live" play so there's no being completely sure, but the pass and catch would probably have gone for six had it been a real game.

White's second catch left no doubt whether or not it was a touchdown.

On a separate 11-on-11 portion, this time going the other direction on the field, it was Kaepernick who found the rookie. The 49ers quarterback stepped up in the pocket and fired a missile down the right sideline for White, who beat his man running a vertical route and caught the pass in stride.

The long connection would have been good for a 52-yard touchdown.

The rookie has been impressive throughout OTAs, minicamp and training camp and will look to turn that into production in the team's final two preseason games.

8 Other Notable Observations

• Rookie offensive lineman Ian Silberman saw first-team snaps at right guard for the second straight day. Marcus Martin moved to center while Joe Staley (LT), Alex Boone (LG) and Erik Pears (RT) manned their normal positions.

• The 49ers rotated running backs constantly, regardless of the other offensive personnel on the field. Each 'back played with the first-, second- and third-team offenses.

• San Francisco's offense scored a number of touchdowns during the red-zone 7-on-7 period. Kaepernick began the drill with back-to-back touchdowns to Vernon Davis and Anquan Boldin. Gabbert followed suit, throwing two more touchdowns to tight ends Davis and rookie Blake Bell. Not to be outdone, rookie quarterback Dylan Thompson threw two scores of his own to DiAndre Campbell and Nigel King.

• During one 11-on-11 period, Kaepernick completed another nice pass to Davis, this time on a play-action fake with Davis running a shallow cross.

• In the 1-on-1 drills between offensive and defensive linemen, Staley began the period by standing up star pass-rusher DeMarcus Ware. Newly acquired offensive lineman Jordan Devey also showed well, recording wins on back-to-back reps. Broncos first-round pick Shane Ray was stood up by 49ers tackle Patrick Miller on another rep.

• Gabbert completed another long pass in team drills, finding Chuck Jacobs down the right sideline. 

• As for the special teams, Phil Dawson made both of his field-goal attempts and Corey Acosta went 2-for-3.

• Thompson finished practice with three impressive passes, one on a perfect back-shoulder throw to King. That completion was followed by two straight passes to Campbell, one on the left sideline and the other deep middle.