Physiological adaptations to osmotic stress and characterization of a polyethylene glycol-responsive gene in Braya humilis

Abstract

Braya humilis (Brassicaceae) is a widely distributed plant in arid and semi-arid regions of northern Asia. This plant is well adapted to extremely arid conditions and is a promising candidate species to discover novel drought tolerance strategies. However, not much information about the mechanism(s) mediating drought resistance in this species is currently available. Therefore, the present study aimed to characterize the physiological traits and expression patterns of a polyethylene glycol (PEG)-responsive gene in B. humilis responding to different levels of osmotic stress induced by PEG-6000. Several important physiological parameters were examined, including the levels of relative water content, soluble protein, malondialdehyde, and antioxidant enzyme activity. A tolerance threshold between 20 and 30% PEG-6000 was identified for B. humilis. The water status and oxidative damage below this threshold were maintained at a relatively constant level during the 12 h of treatment. However, once the threshold was exceeded, the water status and oxidative damage were obviously affected after treatment for 4 h. The soluble protein results suggest that B. humilis maintains a vigorous resistance to osmotic stress and that it may play a greater role in osmotic regulation at late stages of stress. Moreover, superoxide dismutase and catalase may be important at preventing oxidative damage in plants at early stages of stress, while peroxidase may be more involved in some biological processes that resist osmotic stress at the late stage, especially in severely damaged plants. Furthermore, a PEG-responsive gene, BhCIPK12, was identified by differential display reverse transcription-polymerase chain reaction (PCR), cloned, and characterized by quantitative real-time PCR. We hypothesized that this gene may play an important role in mediating osmotic stress or drought resistance in plants. Altogether, these results provide valuable insights into the mechanism(s) mediating drought tolerance in B. humilis.

Arabidopsis IAR4 Modulates Primary Root Growth Under Salt Stress Through ROS-Mediated Modulation of Auxin Distribution

“…Seven-day-old seedlings were treated with 100 mM NaCl for 2 days, and then root samples were harvested. Enzyme extractions were performed at 4°C as described (Wang et al, 2016). Enzyme activities of superoxide dismutase (SOD) and catalase (CAT) were measured with SOD and CAT assay kits (Comin Biotechnology Co., Ltd., Suzhou, China) as described (Pan et al, 2016; Wang et al, 2016).…”

“…Enzyme extractions were performed at 4°C as described (Wang et al, 2016). Enzyme activities of superoxide dismutase (SOD) and catalase (CAT) were measured with SOD and CAT assay kits (Comin Biotechnology Co., Ltd., Suzhou, China) as described (Pan et al, 2016; Wang et al, 2016). Absorbances were measured using a spectrophotometer (DU730, Beckman Coulter) at 560 nm and 240 nm for SOD and CAT, respectively.…”