Trott and Neil Carter put on 102 in 26 overs in a defiant seventh-wicket stand which denied Lancashire their first breakthrough of the day until half an hour before lunch.
Stuart Clark made an immediate breakthrough when his first delivery of the day bounced awkwardly and accounted for Aaron Redmond, who was caught by Ricky Ponting at second slip for three.
The breakthrough was welcome but on such an arduous day England would not have relished the sight of the limpet-like Shivnarine Chanderpaul walking out to bat, a man with a Test average of 100 in the last two years.