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Item CHARACTERIZATION OF 18 F 5 LINES OF AUS RICE(INSTITUTE OF SEED TECHNOLOGY SHER-E-BANGLA AGRICULTURAL UNIVERSITY DHAKA 1207, 2016-06) ISLAM, MD. KAMRULThe investigation was carried out under field conditions to characterize eighteen advanced aus rice lines (F ) during the period of transplanting aus season (2015-2016) at the experimental field of Sher-e-Bangla Agricultural University, Dhaka-1207. The eighteen genotypes of rice were characterized for 10 quantitative and 31 qualitative traits. All the genotypes were characterized and categorized as per the descriptors developed by Biodiversity International, IRRI and WARDA-2007 for DUS test of inbred rice. Among the qualitative characteristics, no variation was observed in case of anthocyanin coloration of leaf sheath, penultimate leaf ligule shape, microscopic observation of pollen with I 2 5 -KI solution, anthocyanin coloration of lemma and palea, anthocyanin coloration of nodes, anthocyanin coloration of internodes, color of stigma, awns in the spikelet and decorticated grain aroma. Among all the quantitative characters, characters like panicle length, thousand grain weight, number of effective tillers per plant, culm length, time of maturity and grain length provided better agronomic performance which resulted in ultimate higher yield per plant. The average days to maturity was 111 days and the average culm length of the tested genotypes was 79.57 cm and most of the genotypes resulted in early maturity and lodging resistance. The most of the genotypes showed average panicle length 24.33 cm and average thousand grain weight 22.67gm resulted in higher yield per plant. These G1, G3, G6, G8, G9, G10, G12, G16 and G18 were the most promising lines in respect of yield and quality which could be released as variety in future.