Hard red winter wheat spot basis bids jumped 11 cents per bushel for trains bound of the US Gulf Coast on Wednesday and held steady at interior elevators as farmers continued to hold back supplies from the summer harvest, dealers said. K.C. wheat futures have rebounded from their roughly decade-lows touched on August 31, but have traded in a sideways pattern for weeks, failing to entice significant new selling from farmers. Gains in Gulf rail market bids followed a recent boost in export demand for US wheat, including last week's largest HRW wheat sale to Morocco in years.