Phenotypic and Molecular Characterization of Wheat Leaf Rust Resistance Gene <i>Lr34</i> in Iranian Wheat Cultivars and Advanced Lines — Oak Academic Publishing
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Phenotypic and Molecular Characterization of Wheat Leaf Rust Resistance Gene <i>Lr34</i> in Iranian Wheat Cultivars and Advanced Lines
College of Agriculture, TarbiatModares University, Tehran, Iran;
,
International Center for Agricultural Research in the Dry Areas (ICARDA), Aleppo, Syria.
,
Seed and Plant Improvement Institute (SPII), Karaj, Iran;
,
College of Agriculture, TarbiatModares University, Tehran, Iran;
1 College of Agriculture, TarbiatModares University, Tehran, Iran;
2 International Center for Agricultural Research in the Dry Areas (ICARDA), Aleppo, Syria.
3 Seed and Plant Improvement Institute (SPII), Karaj, Iran;
4 College of Agriculture, TarbiatModares University, Tehran, Iran;
Lr 34 is a vital gene in developing resistance to leaf rust, stripe rust, and powdery mildew of wheat. Providing simulta neous resistance to various pathogens has made this gene valuable in breeding for wheat resistance to many diseases. The present study investigates the csLV 34 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 as sess the reactions of cultivars and lines which contained Lr 34 under epidemic conditions of leaf rust, these cultivars were cultivated during the 2009 and 2010 cropping season. Of the 130 studied cultivars, 43 contained Lr 34 . Cultivars that were selected and studied in stress conditions had the most frequent presence of Lr 34 . It can be concluded that this gene plays a vital role in increasing the tolerance of cultivars under stress conditions. Lr 34 seems to cause active transition of materials out of the cell. In addition to being resistant to several important diseases of wheat, Lr 34 can increase tolerance to stresses such as salinity. Considering the calculated value for AUDPC (3% - 440%/d) in cultivars containing Lr 34 , it seems that some cultivars contained additional resistance genes. The rate of infection in all cultivars, when presence of Lr 34 was detected through the molecular marker, was lower than in other cultivars. Field results confirmed the results of the analysis using the csLV 34 b molecular marker .
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