Title: Winter wheat susceptibilty to leaf rust and resistance sources to diseases
Abstract: Winter wheat cultivars were significantly infected by <i>Puccinia triticina</i> causing leaf rust in seasons 2000-2002 in southern and also central regions of Poland. Resistance genes <i>Lr9</i>, <i>Lr19</i> and <i>Lr24</i> were found to be effective against dominating populations of the pathogen and typical isolates of <i>P. triticina</i>. Mentioned three resistance genes as well as genes <i>Lr10</i> and <i>Lr37</i> were identified using STS (Sequence Tagged Site) DNA - PCR markers in cultivars and resistance sources. Mentioned markers were found very useful in resistance breeding of wheat.