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Int. J. Mol. Sci. 2015, 16(9), 21959-21974; doi:10.3390/ijms160921959

Metabolite Profiling of Diverse Rice Germplasm and Identification of Conserved Metabolic Markers of Rice Roots in Response to Long-Term Mild Salinity Stress

1
Environmental Risk and Welfare Research Team, Korea Basic Science Institute, Seoul 02855, Korea
2
Omics System Research Team, Korea Basic Science Institute, Seoul 03759, Korea
3
Molecular Breeding Division, National Academy of Agricultural Science, Jeonju 565-851, Korea
4
Protein Structure Team, Korea Basic Science Institute, Cheongju 28119, Korea
5
Department of Molecular Biology, Institute of Nanosensor and Biotechnology, Dankook University, Yongin-si, Gyeonggi-do 448-701, Korea
These authors contributed equally to this work.
Present address: Metabolic Engineering Division, National Academy of Agricultural Science, Jeonju 565-851, Korea;
*
Author to whom correspondence should be addressed.
Academic Editor: Ute Roessner
Received: 27 July 2015 / Revised: 19 August 2015 / Accepted: 6 September 2015 / Published: 11 September 2015
(This article belongs to the Special Issue Metabolomics in the Plant Sciences)
View Full-Text   |   Download PDF [951 KB, uploaded 15 September 2015]   |  

Abstract

The sensitivity of rice to salt stress greatly depends on growth stages, organ types and cultivars. Especially, the roots of young rice seedlings are highly salt-sensitive organs that limit plant growth, even under mild soil salinity conditions. In an attempt to identify metabolic markers of rice roots responding to salt stress, metabolite profiling was performed by 1H-NMR spectroscopy in 38 rice genotypes that varied in biomass accumulation under long-term mild salinity condition. Multivariate statistical analysis showed separation of the control and salt-treated rice roots and rice genotypes with differential growth potential. By quantitative analyses of 1H-NMR data, five conserved salt-responsive metabolic markers of rice roots were identified. Sucrose, allantoin and glutamate accumulated by salt stress, whereas the levels of glutamine and alanine decreased. A positive correlation of metabolite changes with growth potential and salt tolerance of rice genotypes was observed for allantoin and glutamine. Adjustment of nitrogen metabolism in rice roots is likely to be closely related to maintain the growth potential and increase the stress tolerance of rice. View Full-Text
Keywords: rice germplasm; salt stress; root; 1H-NMR; metabolite markers rice germplasm; salt stress; root; 1H-NMR; metabolite markers
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Nam, M.H.; Bang, E.; Kwon, T.Y.; Kim, Y.; Kim, E.H.; Cho, K.; Park, W.J.; Kim, B.-G.; Yoon, I.S. Metabolite Profiling of Diverse Rice Germplasm and Identification of Conserved Metabolic Markers of Rice Roots in Response to Long-Term Mild Salinity Stress. Int. J. Mol. Sci. 2015, 16, 21959-21974.

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