Comparison of heat stress response in cotton (gossypium SPP.) genotypes in Diyarbakir conditions

The average temperature in the last century has increased by 1.5-5.9 ° C throughout the World due to global climate change. A temperature increase of 1-3,5 ° C is predicted until 2100. Turkey is among the countries that will be affected negatively by global climate change. The Aegean and Southeastern Anatolia regions, where about 78% of cotton production has been produced in our country, will be most affected by the high temperatures caused by the global climate change. High temperature stress causes significant loss of productivity by causing square, flower and boll shedding in cotton plant. Therefore, this study was carried out to determine the response of 200 cotton genotypes provided from different countries to temperature stress. The research was carried out in the field of experimental GAP International Agricultural Research and Training Center in field in 2016 in the form of 4 blocks according to the augmented trial design and 5 standard varieties (Gloria, SG 125, Flash, Uzbek 105 and Candia). The data obtained from this study are evaluated together; Deltapine 41, Africa E5 (20025), Campu, NIAB 111, NIAB 777, B557, FH 142, Haridost, Malmal-MHN-786, MNH786, MNH 814, NIAB-KIRN, Sadori, Sohn and VH 260 genotypes were selected to be tolerant to temperature stress. These results show that the selected cotton genotypes would be used as parent in cotton breeding studies to develop tolerant cotton varieties to temperature stress. Key words: Cotton, heat stress, seed cotton yield, fiber quality parameters.