|LV County Championship Division One, Trent Bridge|
|Close, day one: Yorkshire 291-3|
|Yorkshire 2pts, Notts 1pt|
Joe Root hit a career-best 89 not out as Yorkshire dominated Nottinghamshire on the opening day at Trent Bridge.
The 20-year-old shared an unbroken partnership of 107 with Jonny Bairstow (50no) as Yorkshire closed on 291-3.
Earlier, Adam Lyth (57) and Joe Sayers (50) put on 114 for the first wicket after the visitors won the toss.
Andrew Gale (32) also contributed, with Luke Fletcher, Paul Franks and Samit Patel all taking a wicket each for the defending champions.
All-rounders Paul Franks (knee) and Andre Adams (elbow) required injections to be fit for the match, with the latter bowling just nine overs on the opening day.
After Charlie Shreck was ruled out overnight with a knee problem, the hosts turned to former Somerset man Ben Phillips, who was to end the day wicketless on his Championship debut for Notts.
Lyth and Sayers were untroubled in the opening session as Somerset were 101 without loss at lunch.
The break did Notts a favour and both openers were dismissed in the space of three balls, five overs into the afternoon session.
Sayers edged Fletcher to first slip and Lyth spooned his attempted pull shot off Franks to mid-on.
Gale was the only player not to reach a half century as the Yorkshire captain fell to brilliant catch by Adam Voges, running around from slip in anticipation of a sweep off the spin of Patel.
The rest of the day belonged to Yorkshire, who had collapsed to 86 all out in their second innings to hand Notts victory when the two sides meet at Headingley in April.
Root, playing in his sixth first-class match, hit 13 fours as he closed in on a maiden century, an opportunity he still has after being dropped in the penultimate over off the day by Neil Edwards at gully.
CLOSE OF PLAY SUMMARY
BBC Radio Nottingham's Dave Bracegirdle: "With chances at a premium the defending county champions endured a tough day in the field as Yorkshire's top five helped themselves on a friendly, even-paced tracked.
"A new day will inspire tired bodies and, after their recent comeback victory over the same opposition at Headingley, Notts will feel they are very much in this contest if they can enjoy some success on the second morning and keep the visitors' score below 400.
"Joe Root impressed on his way to a career-best 89 and will look forward to adding the extra 11 soon after the re-start."