Blue chips have had a tough day so far with most eyes on the US results season. LSE is no exception, after Goldman Sachs removed it from its Conviction Buy list and downgraded its rating to neutral.Broker comment had a more beneficial impact in the retail sector where Tesco led the supermarket sub-sector higher after Japanese broker Nomura Securities lifted its price target from 405p to 526p.Broker comment also lit a fire under the share price of plumbing supplies merchant Wolseley. Merrill Lynch has raised its rating from 'underperform' to 'buy'. FTSE 100 - RisersWolseley (WOS) 1,453.00p +2.76%Admiral Group (ADM) 1,086.00p +2.55%Tesco (TSCO) 392.65p +2.39%Cable & Wireless (CW.) 142.90p +2.22%Land Securities Group (LAND) 658.50p +1.78%Thomas Cook Group (TCG) 223.80p +1.63%SEGRO (SGRO) 384.80p +1.24%Smith & Nephew (SN.) 536.50p +1.23%FTSE 100 - FallersSmiths Group (SMIN) 925.00p -4.59%Xstrata (XTA) 970.00p -3.19%London Stock Exchange Group (LSE) 905.00p -3.16%British Sky Broadcasting Group (BSY) 564.50p -3.09%WPP Group (WPP) 569.50p -3.06%Man Group (EMG) 355.90p -3.02%Fresnillo (FRES) 807.50p -2.94%Lonmin (LMI) 1,672.00p -2.90%