Characterization of salicylic acid-mediated modulation of the drought stress responses: Reactive oxygen species, proline, and redox state in Brassica napus

Comparative hormonal regulatory pathway of the drought responses in relation to glutamate-mediated proline metabolism in Brassica napus

“…Proline accumulation has been found to be also a primary stress responsive symptom resulting from dehydration in plant tissues such as drought conditions (Kim et al ., 2004; Lee et al ., 2009b), high salinity (Hong et al ., 2000), or freezing temperature (Kaplan et al ., 2007). The proline pool of plant cells depends on the rate-limiting steps in proline synthesis and degradation, which are catalyzed by Δ 1 -pyrroline-5-carboxylate synthease (P5CS) and proline dehydrogenase (ProDH) (Rejeb et al ., 2014; 2015; La et al ., 2019). Multifunctional roles of proline including in preventing oxidative damage, in stabilizing DNA, membranes and protein complex as well as in providing carbon and nitrogen source during stress have been well documented (Szabados and Savouré, 2010).…”

“…Interestingly, proline metabolism has been reported to promote mitochondrial ROS production and enhance ROS in hypersensitive plants (Liang et al ., 2013). Therefore, the modified proline metabolism by drought stress may further involves in drought stress tolerance by regulating intracellular redox potential (La et al ., 2019), as well as energy transfer and reducing power (Szabados and Savouré, 2010; Rejeb et al ., 2014), which are not yet fully understood.…”

“…Increasing evidences have shown that stress responsive ROS and/or proline metabolism are regulated by hormonal signaling pathways (Miura and Tada, 2014; Herrera-Vásquez et al ., 2015; La et al ., 2019). Among these, ABA-dependent signaling pathway has been more emphasized (Boudsocq and Sheen, 2013; Osakabe et al ., 2014).…”

“…Among these, ABA-dependent signaling pathway has been more emphasized (Boudsocq and Sheen, 2013; Osakabe et al ., 2014). Indeed, proline accumulation is partially regulated by an ABA-dependent signaling pathway in osmotic (Chung et al ., 2008) and drought stress (La et al ., 2019). Similarly, enhanced H 2 O 2 , as a ROS signaling from NADPH oxidase, stimulate ABA-induced proline accumulation (Verslues et al ., 2007; La et al ., 2019).…”

“…Indeed, proline accumulation is partially regulated by an ABA-dependent signaling pathway in osmotic (Chung et al ., 2008) and drought stress (La et al ., 2019). Similarly, enhanced H 2 O 2 , as a ROS signaling from NADPH oxidase, stimulate ABA-induced proline accumulation (Verslues et al ., 2007; La et al ., 2019). Several studies have provided evidence for the ROS-mediated SA biosynthesis via Ca 2+ signaling (Seyfferth and Tsuda, 2014; Herrera-Vásquez et al ., 2015), as well as the proline-mediated biosynthesis of SA via NDR1-dependent signaling (Chen et al ., 2011).…”