Evolution of <i>de novo</i> resistance to <i>Puccinia</i> spp. in responses to rust inoculations in sublines descended from susceptible progenitors.

ZS = Susceptible, MR = moderately resistant and R is resistant = 0;2 and susceptible = 34. The 0 is a resistant response, the (;) denotes hypersensitive fleck response, 1 or 2 denote small to medium sized uredinia surrounded by necrosis or chlorosis, with a 2 denoting more numerous uredinia, and 3 or 4 denote medium to large uredinia surrounded by large areas of necrosis or chlorosis. The minus (‘–’) denotes the lower end of the range and the plus (‘+’) the higher end of the range.