نوع مقاله : مقاله پژوهشی
1 دانشجوی دکتری اصلاح نباتات دانشکدگان کشاورزی و منابع طبیعی دانشگاه تهران
2 استاد اصلاح نباتات دانشکدگان کشاورزی و منابع طبیعی دانشگاه تهران
3 اشتادیار موسسه تحقیقات اصلاح و تهیه نهال و بذر، سازمان تحقیقات، آموزش و ترویج کشاورزی، کرج، ایران
4 دانشیار اصلاح نباتات دانشکدگان کشاورزی و منابع طبیعی دانشگاه تهران
5 استاد یار گروه زراعت دانشکده کشاورزی دانشگاه ارومیه
عنوان مقاله [English]
Identification the sources of seedling and adult plant resistance genes is important for gene pyramiding, gene deployment, and developing durable wheat cultivars to control the leaf rust with Puccinia triticinea Erickss agent. In this study, 218 Iranian wheat genotypes collected from different regions were cultivated in one-meter lines in the experimental farm of Golestan Agricultural Research Station in Ahwaz during 2019-2020 and treated with Khouzestan leaf rust prevalent pathotypes including LR-98-8, LR-98-5, LR-94-5 and LR-9-4. Seedling reactions with five prevalent pathotypes were carried out in a randomized complete block design with two replications in the greenhouses of the Cereal Pathology Unit of Seed and Plant Breeding Institute, Karaj. To evaluate resistance, we used Infection Type (IT), AUDPC (Area Under Disease Progression Curve), Final Disease Severity(FDS) and Coefficient Infection (CI) indices. The results showed that 10 percent and 7 percent of the genotypes are resistant in greenhouse and field conditions, respectively. In the adult plant stage, the responses of 23 genotypes were moderately resistant (MR) and 14 genotypes were moderately susceptible (MS). The correlation coefficients between the final disease severity, with the coefficient infection and rAUDPC were 0.989 and 0.949, respectively. Finally, 30 genotypes with the desired characteristics, ie final disease severity between 0-40%, coefficient of infection between 0-40 and rAUDPC between 0-30% were selected as the suitable genotypes. Cluster analysis classified the genotypes into four groups: susceptible (S), moderately susceptible (MS), moderately resistant (MR) and resistant (R).