title: Enhancing tolerance of rice (Oryza sativa) to simulated acid rain by exogenous abscisic acid.
abstract: Abscisic acid (ABA) regulates much important plant physiological and biochemical processes and induces tolerance to different stresses. Here, we studied the regulation of exogenous ABA on adaptation of rice seedlings to simulated acid rain (SAR) stress by measuring biomass dry weight, stomatal conductance, net photosynthesis rate, nutrient elements, and endogenous hormones. The application of 10 μM ABA alleviated the SAR-induced inhibition on growth, stomatal conductance, net photosynthesis rate, and decreases in contents of nutrient (K, Mg, N, and P) and hormone (auxin, gibberellins, and zeatin). Moreover, 10 μM ABA could stimulate the Ca content as signaling molecules under SAR stress. Contrarily, the application of 100 μM ABA aggravated the SAR-induced inhibition on growth, stomatal conductance, net photosynthesis rate, and contents of nutrient and hormone. The results got after a 5-day recovery (without SAR) show that exogenous 10 μM ABA can promote self-restoration process in rice whereas 100 μM ABA hindered the restoration by increasing deficiency of nutrients and disturbing the balance of hormones. These results confirmed that exogenous ABA at proper concentration could enhance the tolerance of rice to SAR stress.
authors.affiliation: State Key Laboratory of Food Science and Technology, Jiangsu Key Laboratory of Anaerobic Biotechnology, College of Environment and Civil Engineering, Jiangnan University, Wuxi, 214122, China.
authors.forename: Xi
authors.initials: X
authors.lastname: Wu
authors.affiliation: State Key Laboratory of Food Science and Technology, Jiangsu Key Laboratory of Anaerobic Biotechnology, College of Environment and Civil Engineering, Jiangnan University, Wuxi, 214122, China. liangchanjuan@jiangnan.edu.cn.|Jiangsu Cooperative Innovation Center of Technology and Material of Water Treatment, Wuxi, 214122, China. liangchanjuan@jiangnan.edu.cn.
authors.forename: Chanjuan
authors.initials: C
authors.lastname: Liang
mesh_terms: D000040:Abscisic Acid / Q000494:pharmacology*; D000064:Acclimatization / Q000187:drug effects; D015258:Acid Rain; D000222:Adaptation, Physiological; D018506:Gene Expression Regulation, Plant / Q000187:drug effects; D005875:Gibberellins; D007210:Indoleacetic Acids; D012275:Oryza / Q000254:growth & development*; D010788:Photosynthesis / Q000187:drug effects; D036226:Seedlings / Q000187:drug effects
chemical_list: D015258:Acid Rain; D005875:Gibberellins; D007210:Indoleacetic Acids; D000040:Abscisic Acid
keywords: ABA application; Hormone; Mineral nutrient; Rice seedlings; Simulated acid rain