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Title of Journal: Plant Mol Biol

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Abbravation: Plant Molecular Biology

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Springer Netherlands

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DOI

10.1007/978-94-011-1336-6_31

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1573-5028

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Saltinduced expression of genes related to NaSup

Authors: Mingquan Ding Peichen Hou Xin Shen Meijuan Wang Shurong Deng Jian Sun Fei Xiao Ruigang Wang Xiaoyang Zhou Cunfu Lu Deqiang Zhang Xiaojiang Zheng Zanmin Hu Shaoliang Chen
Publish Date: 2010/02/16
Volume: 73, Issue: 3, Pages: 251-269
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Abstract

Using the Affymetrix poplar genome array we explored the leaf transcriptome of salttolerant Populus euphratica Oliv and saltsensitive P popularis 3544 P popularis under control and saline conditions Our objective was to clarify the genomic differences in regulating K+/Na+ and reactive oxygen species ROS homeostasis between the two species Compared to P popularis salttolerant P euphratica responses to salinity involved induction of a relatively larger number of probesets after shortterm ST exposure to 150 mM NaCl 24 h and relatively fewer probesets after a longterm LT exposure to salinity 200 mM NaCl 28 days Compared to P popularis leaves of the control P euphratica plants exhibited a higher transcript abundance of genes related to Na+/H+ antiport Na+/H+ antiporters H+ pumps and K+ uptake and transport Notably the expression of these genes did not decrease with a few exceptions during salt treatment Regarding ROS homeostasis P euphratica exhibited rapid upregulation of a variety of antioxidant enzymes after exposure to ST salinity indicating a rapid adaptive response to salt stress However the effect of NaCl on transcription in P popularis leaves was more pronounced after exposure to prolonged salinity LTstressed P popularis upregulated some genes mediating K+/Na+ homeostasis but decreased transcription of main scavengers of superoxide radicals and H2O2 except for some isoforms of a few scavengers Mineral and ROS analyses show that NaCl induced a marked increase of leaf Na+ and H2O2 in LTstressed plants of the two species and the effects were even more pronounced in the saltsensitive poplar We place the transcription results in the context of our physiological measurements to infer some implications of NaClinduced alterations in gene expression related to K+/Na+ and ROS homeostasisThe research was supported jointly by the HITECH Research and Development Programme of China 863 Programme grant number 2006AA10Z131 the National Natural Science Foundation of China grant numbers 30430430 30872005 the Foundation for Supervisors of Beijing Excellent Doctoral Dissertations grant number YB20081002201 the Foundation for Authors of the National Excellent Doctoral Dissertation of PR China grant number 200152 the Teaching and Research Award Programme for Outstanding Young Teachers at Higher Education Institutions of the Ministry of Education MOE PRC grant number 2002323 the Key project of the MOE PRC grant number 200984 and the Natural Science Foundation of Hubei Province grant number 2007ABB003 We thank Prof Dr Tom Hazenberg Faculty of Forestry and the Forest Environment Lakehead University Thunder Bay ON Canada for his English corrections We acknowledge the offer for the use of the confocal miscroscope by the Platform of Large Instruments and Equipment at Beijing Forestry University

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