title: Hg-responsive proteins identified in wheat seedlings using iTRAQ analysis and the role of ABA in Hg stress.
abstract: Wheat seedlings exposed to 100 μM HgCl2 for 3 days exhibited high-level mercury (Hg) accumulation, which led to inhibited growth, increased lipid peroxidation, and disrupted cellular ultrastructures. And root growth and ultrastructural changes of wheat seedlings were inhibited more severely than those of leaves. To identify the wheat protein response to Hg stress, the iTRAQ method was used to determine the proteome profiles of the roots and leaves of wheat seedlings exposed to high-Hg conditions. 249 proteins were identified with significantly altered abundance. 117 were found in roots and 132 in leaves. These proteins were classified into signal transduction, stress defense, carbohydrate metabolism, protein metabolism, energy production, and transport functional groups. The majority of proteins identified in Hg-stressed roots and leaves displayed differently altered abundance, revealing organ-specific differences in adaption to Hg stress. Pathway Studio software was used to identify the Hg-responsive protein interaction network that included 49 putative key proteins, and they were potentially regulated by abscisic acid (ABA). Exogenous ABA application conferred protection against Hg stress and increased activities of peroxidase enzyme, suggesting that it may be an important factor in the Hg signaling pathway. These findings can provide useful insights into the molecular mechanisms of Hg responses in higher plants.
authors.affiliation: The Collaborative Innovation Center of Henan Grain Crops, Henan Agricultural University , Zhengzhou, 450002, China.
authors.forename: Guozhang
authors.initials: G
authors.lastname: Kang
authors.forename: Gezi
authors.initials: G
authors.lastname: Li
authors.forename: Lina
authors.initials: L
authors.lastname: Wang
authors.forename: Liting
authors.initials: L
authors.lastname: Wei
authors.forename: Yang
authors.initials: Y
authors.lastname: Yang
authors.forename: Pengfei
authors.initials: P
authors.lastname: Wang
authors.forename: Yingying
authors.initials: Y
authors.lastname: Yang
authors.forename: Yonghua
authors.initials: Y
authors.lastname: Wang
authors.forename: Wei
authors.initials: W
authors.lastname: Feng
authors.forename: Chenyang
authors.initials: C
authors.lastname: Wang
authors.forename: Tiancai
authors.initials: T
authors.lastname: Guo
mesh_terms: D000040:Abscisic Acid / Q000378:metabolism*; D000704:Analysis of Variance; D002852:Chromatography, Ion Exchange; D002853:Chromatography, Liquid; D018506:Gene Expression Regulation, Plant / Q000187:drug effects*; D015227:Lipid Peroxidation / Q000187:drug effects; D008628:Mercury / Q000493:pharmacokinetics* / Q000633:toxicity; D046529:Microscopy, Electron, Transmission; D010940:Plant Proteins / Q000378:metabolism*; D018517:Plant Roots / Q000187:drug effects; D036226:Seedlings / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism*; D013312:Stress, Physiological / Q000187:drug effects*; D053719:Tandem Mass Spectrometry; D014908:Triticum / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism*
chemical_list: D010940:Plant Proteins; D000040:Abscisic Acid; D008628:Mercury
keywords: ABA; Triticum aestivum L.; interaction network; mercury; proteomics; ultrastructure