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Expression of MaMAPK Gene in Seedl.ngs of malus *** Water Stress

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

作者： l.-Xin PENG~(1,2) l.ng-Kun GU~2 Cheng-Chao ZHENG~2 De-Quan l.~2* Huai-Rui SHU~2 1 Department of Horticul.ure,Tianjin Agricuhural.Col.ege,Tianjin 300384,China 2 Col.ege of l.fe Science,Shandong Agricul.ural.University,Tai'an 271018,China Department of Horticul.ure Tianjin Agricultural CollegeTianjin 300384 China Col.ege of l.fe Science Shandong Agricultural UniversityTai'an 271018 China

Seedl.ngs 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-tol.rant species;and malus micromalus,a middl. *** showed that malusMAPK (MaMAPK,GenBank accession ***435805) was expressed in both roots and l.aves of seedl.ngsof the three malus species treated with 20% pol.ethyl.ne gl.col.for different time *** l.vel.peaked at 1.5 h after treatment with pol.ethyl.ne gl.col.then decreased to their l.west *** kinaseassays indicated that the dynamic changes of MAPK activity were very simil.r to those of the rel.tiveexpression of MaMAPK ***,the peak of the former occurred sl.ghtl. behind the *** wasnoticed that,al.hough the kinase activity decreased after the peak,it was stil. higher than that of the control.uring the whol. time *** resul.s suggested that MaMAPK was regul.ted not onl. by water stressat the transcription l.vel.but al.o by phosphoryl.tion and dephosphoryl.tion at the protein *** addition,of these three appl. species,the highest MAPK activity and MaMAPK expression l.vel.was found in ***,fol.owed by *** and ***,suggesting that MAPK might be correl.ted withdrought tol.rance in these three *** different expression l.vel. might be one of the mol.cul.rmechanisms of the different drought tol.rances in malus.

关键词： expression characteristics malus l. MaMAPK gene water stress

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