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¹ Atatürk Üniversitesi Ziraat Fakültesi, Tarla Bitkileri Bölümü, Erzurum DOI : 10.21566/tarbitderg.279678 - Vegetative period (VP) and grain filling period (GFP) are closely related to grain yield since VP affects size of photosynthetic area and the number of potential grain, while GFP affects grain weight. To investigate the effects of late drought on these characters, this research carried out with 64 bread wheat genotypes under Erzurum conditions in 2011-12 and 2012-13 cropping seasons according to the 8x8 square lattice experimental design in two experiments (irrigated and late drought stress). According to average of cropping seasons, VP of genotypes ranged from 12.1 days (Bolal 2973) to 19.8 days (Lancer) under irrigated condition, while their VP varied between 11.9 days (Prostar) and 19.1 days (Gün 91) in late drought condition. According to the average of the crop year and genotypes, VP was 16.7 days in irrigated condition and was 16.0 days in the late drought condition. GFP of genotypes varied between 34.9 days (Pehlivan) and 41.4 days (Palandöken 97) in irrigated condition, while their GFP ranged from 27.2 days (Kırkpınar 79) to 32.5 days (Türkemen). GFP was 38.1 days in irrigated condition, while it was 29.1 days in late drought condition. The maximum reduction in GFP was determined in Özlü Buğday, Ankara 093/44, Zerin, Köse 220/39 and Koca Buğday genotypes, while minimum reduction was determined in Mızrak, Alparslan, Gün 91, Türkmen and Aytın 98 genotypes in late drought condition. Keywords : Wheat, drought, vegetative period, grain filling period