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Molecular Plant Advance Access originally published online on October 8, 2008
Molecular Plant 2009 2(1):22-31; doi:10.1093/mp/ssn058
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© The Author 2008. Published by the Molecular Plant Shanghai Editorial Office in association with Oxford University Press on behalf of CSPP and IPPE, SIBS, CAS.

Overexpression of SOS (Salt Overly Sensitive) Genes Increases Salt Tolerance in Transgenic Arabidopsis

Qing Yanga,b,c, Zhi-Zhong Chena,b,c, Xiao-Feng Zhoua,b,c, Hai-Bo Yina,b,c, Xia Lia,b,c, Xiu-Fang Xina,b,c, Xu-Hui Honga,b,c, Jian-Kang Zhuc,d and Zhizhong Gonga,b,c,1

a State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing 100193, China
b The National Center for Plant Gene Research, Beijing, China
c University of California-Riverside-China Agricultural University Joint Center for Plant Cell and Molecular Biology, Beijing 100193, China
d Department of Botany and Plant Sciences, Institute for Integrative Genome Biology, 2150 Batchelor Hall, University of California, Riverside, CA 92521, USA

1 To whom correspondence should be addressed. E-mail gongzz{at}cau.edu.cn, fax 86-10-62733733.

Soil salinity is a major abiotic stress that decreases plant growth and productivity. Recently, it was reported that plants overexpressing AtNHX1 or SOS1 have significantly increased salt tolerance. To test whether overexpression of multiple genes can improve plant salt tolerance even more, we produced six different transgenic Arabidopsis plants that overexpress AtNHX1, SOS3, AtNHX1 + SOS3, SOS1, SOS2 + SOS3, or SOS1 + SOS2 + SOS3. Northern blot analyses confirmed the presence of high levels of the relevant gene transcripts in transgenic plants. Transgenic Arabidopsis plants overexpressing AtNHX1 alone did not present any significant increase in salt tolerance, contrary to earlier reports. We found that transgenic plants overexpressing SOS3 exhibit increased salt tolerance similar to plants overexpressing SOS1. Moreover, salt tolerance of transgenic plants overexpressing AtNHX1 + SOS3, SOS2 + SOS3, or SOS1 + SOS2 + SOS3, respectively, appeared similar to the tolerance of transgenic plants overexpressing either SOS1 or SOS3 alone.

Key Words: abiotic/environmental stress • salinity • signal transduction


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