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Expression of mamapk gene in Seedlings of Malus *** Water Stress

Acta Biochimica et Biophysica Sinica 2006年第4期38卷 281-286页

作者： Li-Xin PENG~(1,2) Ling-Kun GU~2 Cheng-Chao ZHENG~2 De-Quan LI~2* Huai-Rui SHU~2 1 Department of Horticulture,Tianjin Agricuhural College,Tianjin 300384,China 2 College of Life Science,Shandong Agricultural University,Tai'an 271018,China Department of Horticulture Tianjin Agricultural CollegeTianjin 300384 China College of Life Science Shandong Agricultural UniversityTai'an 271018 China

Seedlings of three species of Malus were used to study the expression of mitogen-activatedprotein kinase (MAPK) in response to water stress:Malus hupehensis,a drought-sensitive species;Malussieversii,a drought-tolerant species;and Malus micromalus,a middle *** showed that MalusMAPK (mamapk,GenBank accession ***435805) was expressed in both roots and leaves of seedlingsof the three Malus species treated with 20% polyethylene glycol for different time *** levelspeaked at 1.5 h after treatment with polyethylene glycol,then decreased to their lowest *** kinaseassays indicated that the dynamic changes of MAPK activity were very similar to those of the relativeexpression of mamapk ***,the peak of the former occurred slightly behind the *** wasnoticed that,although the kinase activity decreased after the peak,it was still higher than that of the controlduring the whole time *** results suggested that mamapk was regulated not only by water stressat the transcription level,but also by phosphorylation and dephosphorylation at the protein *** addition,of these three apple species,the highest MAPK activity and mamapk expression level was found in ***,followed by *** and ***,suggesting that MAPK might be correlated withdrought tolerance in these three *** different expression levels might be one of the molecularmechanisms of the different drought tolerances in Malus.

关键词： expression characteristics Malus L. mamapk gene water stress

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