4.3 Drought responses of S. krylovii
When plants are subjected to drought stress, they usually reduce photosynthetic capacity to reduce water consumption, and reduce their growth and ensure their survival (Dias et al., 2007; Poorter et al., 2012), and similar results were found in this study (Table 2). Furthermore, we tried to explore the functioning changing of S. krylovii facing to heavy drought treatment based on RNA-Seq data. The significantly enriched pathways by KEGG based on DCGs were glycolysis / glycoconeogenesis, starch and sucrose metabolism, MAPK signaling pathway-plant and plant hormone signal transduction, with relative larger number of genes significantly up-regulated (Table S6 & S7). This finding indicated that S. krylovii compensated for the damage under the drought stress condition by continuously enhancing its metabolic vigor, which was consistent with the drought stress on Kentucky bluegrass (Poa pratensis ) (Bushman et al., 2021). Similar pathways of responses to drought stress were found in other species, such as glycolysis / glycoconeogenesis pathway for okra (Abelmoschus esculentus ) (Shi et al., 2020), starch and sucrose metabolism pathway for Verbena bonariensis (Wang et al., 2018), plant hormone signal transduction pathway for foxtail millet (Setaria italica ) (Qin et al., 2020), MAPK signaling pathway-plant for peanut (Arachis hypogaea ) (Zhao et al., 2021).