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Plant and Cell Physiology Advance Access published online on March 4, 2009
Plant and Cell Physiology, doi:10.1093/pcp/pcp038
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© The Author 2009. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

Comparative Profiles of Gene Expression in Leaves and Roots of Maize Seedlings under the Conditions of the Salt Stress and the Removal of the Salt Stress

Dong-Jin Qinq1,2, Hai-Feng Lu1,2, Ning Li3, Hai-Tao Dong4, Deng-Feng Dong5 and You-Zhi Li1,2

1 Guangxi Key Laboratory of Subtropical Bioresource Conservation and Utilization; 2 College of Life Science and Technology, Guangxi University, Nanning, Guangxi 530005, P.R.China
3 Department of Biology, The Hong Kong University of Science and Technology, Clear water bay, Hong Kong SAR, China.
4Institute of Biotechnology, Zhejiang University, Hangzhou, Zhejiang 310029, P.R.China
5 Agricultural College, Guangxi University, Nanning, Guangxi 530005, P.R.China

Corresponding author: Dr. Youzhi Li, College of Life Science and Technology, Guangxi University, Nanning, Guangxi 530005, P.R.China. Phone: +86-771-3270103; Fax: +86-771-3270130; E-mail: dyzl{at}gxu.edu.cn


  Abstract

We studied transcriptional profiles of leaves and roots of three-leaf-stage seedlings of the maize inbred line YQ7-96 under the conditions of salt stress (100 mM NaCl) and removal of the salt stress (RSS). A total number of 296 genes were regulated specifically by the stress, of which 206 genes were specific to leaves and 90 genes were specific to roots. Stress-regulated genes were classified into eight and seven expression patterns for leaves and roots, respectively. There were 60 genes which were regulated specifically by RSS, of which 27 genes were specific to leaves and 33 genes were specific to roots. No genes were found to be co-regulated in tissues and to be regulated commonly by the stress and RSS. It can be concluded that (1) at the early stage of the stress, transcriptional responses are directed at water deficit (WD) in maize leaves but at both WD and Na+ accumulation (NA) in roots; (2) at the later stage, the responses in leaves and roots result from dual effects of both WD and NA; (3) the metabolic pathway of polyamine is an important linker for the co-ordination between leaves and roots to accomplish the whole maize plant tolerance to the stress; (4) the stress can lead to genomic restructuring and nuclear transport in maize; (5) maize leaves are distinct from roots in molecular mechanisms for responses to and growth recovery from the stress; (6) mechanisms for the maize responses to the stress differ from those for their growth recovery during RSS.

Keywords: Maize - Leaf - Root - Gene expression - Salt stress - Removal of the stress

(Received December 4, 2008; Accepted March 1, 2009)
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