ارزیابی مقاومت ژنوتیپ‌های مختلف گندم نان نسبت به نماتد سیستی غلات(Heterodera filipjevi) در شرایط گلخانه

Cereal cyst nematodes (CCNs) are considered as the most important group of plant parasitic nematodes on wheat and acknowledged globally as a biotic constraint for wheat production, particularly under rain-fed conditions and drought stress. Among species of CCNs, Heterodear filipjevi is the dominant species in most cereal growing areas of Iran and is widespread in different regions of the country. Assessment of crop loss caused by H. filipjevi in som cultivars including Back-cross Rowshan, Pishtaz and Parsi under field conditions in Iran showed, significant reduction of grain yield ranged 20- 25 percent.The reaction of common accessions of bread wheat, including some cultivars and lines, to H. filipjevi was assessed according to used method for screening of wheat accessions under controlled conditions (Dababat, 2014). The results showed that Back-cross Rowshan accession with mean 30.2 and Silverstar accession with mean 6.8 had the most and the least number of cysts in soil and root of each plant, respectively. Cluster analysis divided all accessions into 4 groups. Back-cross Rowshan, Pishtaz and Pishgam accessions were identified as highly susceptible according to higher mean of the cyst number in soil and root, in comparison to Bezostaya accession (Susceptible check). Mahdavi, Bam, Dena, Bahar, Sivand, Ofogh, Arg and Bezostaya accessions were categorized as susceptible. Rowshan, Alvand, Parsi, Es-93-95 and Marvdasht accessions were groupted as moderately susceptible, and, Sirvan, M-90-9, M-90-7 and Silverstar (Moderately resistant check) accessions were identified as moderately resistant. Complementary studies about assessing the bread wheat accessions to cereal cyst nematodes, H. filipjevi, under field conditions are recomended.