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¹ Trakya Tarımsal Araştırma Enstitüsü, Edirne, Türkiye
² Namık Kemal Üni. Ziraat Fak. Tarla Bitkileri Böl. Tekirdağ, Türkiye DOI : 10.21566/tarbitderg.4436647 - The root structure, which is a very important factor in arid conditions in bread wheat, may vary depending on environmental and genetic factors. Root weight of some bread wheat genotypes were investigated under different drought stress condition on the root weight and on some physiological characters. This study was carried out in experimental field of Trakya Agricultural Research Institute in 2008-2009 and 2009- 2010 seasons with 15 bread wheat genotypes in split block design technique with 3 replicate. Five drought applications were the main plots and germplasms were sub-plots. Drought applications were performed from stem elongation stage to physiological maturating stage. Drought stress applications reduced the root weight. The highest root weight was determend in CV Bereket with 3.618 g. Drought stress effected the root weight at different ratios. The lowest root weight was obtained to fully drought condition with 2.815 g and the highest root weight was determined at non-stress treatment.The increase of root weight in genotypes promote the chlorophyll content in the flag leaves during pre-emergence and grain filling periods. Root weight reduced the canopy temperature under all drought stress applications. It was determined that when the amount of root in the plant enhanced the number of days of heading, maturation days and grain filling periods were increased. While the root weight promoted the stomata width and length, on the contrary it reduced the stomata number. Though the root weigth and environmental factors were affected by genotypes; chlorophyll content in leaves was increased and canopy temperature was decreased. Keywords : Bread wheat, variety, drought, root weight, agronomic characters