واکنش اکوتیپ های مختلف رازیانه تحت تنش کم آبی براساس خصوصیات مورفو-فنولوژیکی و کمی

Fennel is one of the most important medicinal plants that can be grown in a wide range of climates.Abiotic stresses, such as drought (water deficit), salinity and temperature, are the main limiting factors of crop yield production in arid and semi-arid environments. Although drought stress would reduce crop yield, it could have positive effects on herbal essential constituents. Thus more attention would be required to the application of medicinal plants than previously considered.Therefore, the primary aim of this study was to study the response of different ecotypes of fennel to water deficit stress that imposed during reproductive stages, in terms of grain yield and effective quality components. In this experiment, seven different ecotypes of fennel were compared in a randomized complete block design with three replications under normal and water deficit conditions. Bojnourd ecotype had the highest yield under normal condition, while under stress conditions, the ecotypes of Mashhad, Nishapur, Khosf and Bojnourd were located in a high yielding class, Ilam and Roman ecotypes were at the middle class and Gonabad showed the lowest yield.