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This study was carried out to determine the drought stress tolerant varieties of the perennial Lolium perenne L., which is the most used type of grass in the facility of grass fields. In the study, 4 perennial ryegrass (Lolium perenne L.) cultivars were used as a plant material. The experiment was carried out in petri dishes settled in growth cabinet with according to factorial arrangement of Complete Randomized Design with four replications. To determine the effect of of drought stress the doses of 0, -0.4, -0.8, -1.2 ve -1.6 MPa Polietilen glikol 6000 (PEG-6000) were used in a petri experiments. Germination percentage, germination index, mean germination time, shoot length, root length, shoot dry weight and root dry weight were determined. All investigated traits were adversely affected as increased PEG doses. All cultivars did not germinate drought stress of -1.2 and 1.6 MPa in petri. The highest germination rate was determined in Solstice II cultivar in application of (-0.4 MPa) drought stress (97.5%), and the lowest germination rate was in Barminton cultivar (51.5%) in application of drought stress of (-0.8 MPa). As a result of the research, it was determined that the Solstic II variety shows better germination and seedling development in drought conditions than other varieties, therefore it can be preferred in drought stress conditions Research Article Article History Received : 06.08.2020 Accepted : 08.10.2020

Lolium perenne L. Çeşitlerinde Kuraklık Stresinin Çimlenme ve Erken Fide Gelişimi Üzerine Etkisi