ISEEP-2017 VIII. Internatıonal Symposium on Ecology and Environmental Problems, Çanakkale, Türkiye, 4 - 07 Ekim 2017, ss.209
Strigolactones (SLs) are signaling molecules and synthesizing from carotenoids. They are effective in the response of plants to metabolic and environmental events, in the interaction with other organisms such as parasite plants, and in the auxin-signaling pathway. On the other hand, salt stress is a major abiotic stress factor that limits wheat yield in the world. This study was aimed to investigate the role of SL treatment (20 μM GR24) on growth parameters under salt stress (0, 100, 200 mM NaCl) in drought-resistant (Tosunbey) and drought-sensitive (Sultan-95) wheat varieties. Root and shoot samples were collected in 0 and 7th days. With this aim, the changes in relative water contents (RWC), chlorophyll contents, root and shoot lengths were determined.
Our results showed that 200 mM NaCl+20 μM GR24 increased the stem length by 7%, chlorophyll content by 13%, and RWC by 40% in Sultan 95 varieties. In Tosunbey variety, the root length did not change, shoot length decreased, chlorophyll content increased 44% and RWC increased 19% at the same concentration. According to these results, GR24 application may have a protective effect against negative effects of salt stress by increasing the water holding capacity and chlorophyll content in salt-sensitive cultivars. In addition, the SL application seems to have good potential for increase the yield in resistant varieties.