Root, who replaced Alastair Cook as skipper in February, will take charge in the four-test series starting at Lord's on July 6.
"It will be a very proud day for Joe, and he has a lot of good and very experienced people around him to bounce ideas off," Bairstow told reporters.
"We have players with more than 100 test caps in the team," he said, referring to the likes of Cook and paceman Stuart Broad who is racing against time to recover from a heel injury to play the Lord's test.
"Joe himself has got fifty or so and I’m one of the guys with 30-odd tests now."
"It's exciting, and I am sure Joe will be putting his own stamp on the job and his own authority on it, while we as a side will be looking forward to playing under him."
Bairstow also pressed the case of Gary Ballance's return to the test side after the Yorkshire skipper scored 815 County Championship runs at an average of 101.87 this season.
"Gaz's (Ballance) form is second to none," Bairstow said.
"He's scored a serious amount of runs this season for Yorkshire, just as he's scored a serious amount of runs over a long period of time.
"We don't know what the (England) selection is going to be, but Gaz is a serious player and a class act."
alastair cookEngland vs South Africa 2017england-south africaGary BallanceJoe RootJonny BairstowRootRoot England Captain
First Published: June 29, 2017, 4:29 PM IST