title: Nitric oxide, as a downstream signal, plays vital role in auxin induced cucumber tolerance to sodic alkaline stress.
abstract: Nitric oxide (NO) and auxin (indole-3-acetic acid; IAA) play vital roles in regulating plants tolerance to abiotic stresses. This study showed that both NO and IAA could induce cucumber plants tolerance to sodic alkaline stress, which depended on their roles in regulating reactive oxygen species (ROS) scavenging, antioxidative enzymes activities, Na(+) accumulation and protecting photosystems II (PSII) from damage. In addition, IAA has significant effect on NO accumulation in cucumber root, which could be responsible for IAA-induced sodic alkaline stress tolerance. Further investigation indicated that the function of IAA could be abolished by NO scavenger (cPTIO). On the contrary, IAA transport inhibitor (NPA) showed no significant effects on abolishing the function of NO. Based on these results, it could be concluded that NO is an essential downstream signal for IAA-induced cucumber tolerance to sodic alkaline stress.
authors.affiliation: State Key Laboratory of Crop Biology, Scientific Observing and Experimental Station of Environment Controlled Agricultural Engineering in Huang-Huai-Hai Region, Ministry of Agriculture, College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an 271018, PR China.
authors.forename: Biao
authors.initials: B
authors.lastname: Gong
authors.affiliation: State Key Laboratory of Crop Biology, Scientific Observing and Experimental Station of Environment Controlled Agricultural Engineering in Huang-Huai-Hai Region, Ministry of Agriculture, College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an 271018, PR China.
authors.forename: Li
authors.initials: L
authors.lastname: Miao
authors.affiliation: Resources and Environment Department, Heze Univeristy, Heze 274015, PR China.
authors.forename: Wenjie
authors.initials: W
authors.lastname: Kong
authors.affiliation: College of Life Sciences, Shandong Agricultural University, Tai'an 271018, PR China.
authors.forename: Ji-Gang
authors.initials: JG
authors.lastname: Bai
authors.affiliation: State Key Laboratory of Crop Biology, Scientific Observing and Experimental Station of Environment Controlled Agricultural Engineering in Huang-Huai-Hai Region, Ministry of Agriculture, College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an 271018, PR China.
authors.forename: Xiufeng
authors.initials: X
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Crop Biology, Scientific Observing and Experimental Station of Environment Controlled Agricultural Engineering in Huang-Huai-Hai Region, Ministry of Agriculture, College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an 271018, PR China.
authors.forename: Min
authors.initials: M
authors.lastname: Wei
authors.affiliation: State Key Laboratory of Crop Biology, Scientific Observing and Experimental Station of Environment Controlled Agricultural Engineering in Huang-Huai-Hai Region, Ministry of Agriculture, College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an 271018, PR China. Electronic address: qhshi@sdau.edu.cn.
authors.forename: Qinghua
authors.initials: Q
authors.lastname: Shi
mesh_terms: D018553:Cucumis sativus / Q000378:metabolism*; D007210:Indoleacetic Acids / Q000378:metabolism; D009569:Nitric Oxide / Q000378:metabolism*; D045332:Photosystem II Protein Complex / Q000378:metabolism*; D015398:Signal Transduction; D012964:Sodium / Q000378:metabolism*; D013312:Stress, Physiological
chemical_list: D007210:Indoleacetic Acids; D045332:Photosystem II Protein Complex; D009569:Nitric Oxide; D012964:Sodium
keywords: Cucumber; IAA; NO; ROS; Sodic alkaline stress