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Post-control seeds were cultivated in the area with 20 square meters (8 lines with 25 in 25 cm interval and 10 m length) in Rice Institute of Mazandaran Branch (Amol) in order to investigate 41 seed samples from 10 introduced rice cultivars classified in pre-basic, basic and certified in the official seed cycle of the country which were collected from two provinces (Mazandaran and Gilan). Moreover, 10 original cultivar samples were received from Rice Research Institute of Iran (RRII) which were cultivated as reference collection. Firstly, cultivars participant in reference collection and seed samples of post-control fields were assessed in terms of integrity of seed samples by comparing morphological features complied with introductions (UPOV). Then, plants of other cultivars and species in each post control were determined by observation and counting, and genetic purity percentage of seed samples were counting and calculated by comparing to standards of the Organization for Economic Cooperation and Development (OECD). Results indicated that from investigated 41 total seed samples (10 cultivars), 25 and 16 samples belonged to Gilan and Mazandaran, respectively. The 35 cultivars were standard and 5 cultivars due to integrity and 6 cultivars due to genetic purity were rejected in 41 total samples. Each 5 rejected samples because of integrity were relevant to Fajr cultivar which were classified in pre-basic (one sample), basic (one sample), and certified (3 samples) of Mazandaran. From 6 rejected samples because of purity 4 samples were relevant to Gilan (Annam, pre-basic, one sample), Khazar (pre-basic, one sample), Gilar (pre-basic, one sample), Gilaneh (basic, one sample), and two cultivars were related to Mazandaran, Tissa (basic, one sample) and Neda (pre-basic, one sample).
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