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Lr34 is a vital gene in
developing resistance to leaf rust, stripe rust, and powdery mildew of wheat.
Providing simultaneous resistance to various pathogens has made this gene
valuable in breeding for wheat resistance to many diseases. The present study investigates the csLV34 marker’s capability in diagnosing this locus in130 wheat
commercial cultivars and advanced wheat lines from Iran, and assesses the impact of this gene
on disease severity in field conditions. To assess the reactions of
cultivars and lines which contained Lr34 under epidemic conditions of leaf rust, these cultivars
were cultivated during the 2009 and 2010 cropping season. Of the 130 studied
cultivars, 43 contained Lr34. Cultivars that were selected
and studied in stress conditions had the most frequent presence of Lr34.
It can be concluded that this gene plays a vital role in increasing the
tolerance of cultivars under stress conditions. Lr34 seems to cause active