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Journal of Agricultural and Food Chemistry 2019-Oct

In situ study of metabolic response of Arabidopsis thaliana leaves to salt stress by neutral desorption-extractive electrospray ionization mass spectrometry.

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Krækjan er vistuð á klemmuspjaldið
Dong Wu
Meng Cui
Yingbin Hao
Lihua Liu
Yalian Zhou
Wenjing Wang
Ahui Xue
Konstantin Chingin
Liping Luo

Lykilorð

Útdráttur

Abstract:Salt stress is one of the most common factors limiting plant cultivation. In this study, metabolic responses to salt stress in Arabidopsis thaliana (A. thaliana) leaves were analyzed in situ by neutral desorption-extractive electrospray ionization mass spectrometry (ND-EESI-MS) without any sample pretreatment. Metabolic changes of A. thaliana leaves were observed in response to salt stress conditions, including the levels of serine, glutamic acid, arginine, cinnamic acid, ferulic acid, caffeic acid, protocatechuic acid, epicatechin, morin, myricetin, apigravin and β-cotonefuran. The content of serine increased under 50, 100 and 200 mM NaCl salt stress, reaching to the highest level at 200 mM NaCl, but decreased under the maximum concentration of 300 mM NaCl. Similar phenomenon was observed for arginine, glutamic acid, cinnamic acid, caffeic acid, ferulic acid and epicatechin respectively involved in the metabolic pathway of shikimate-phenylpropanoid. Both principal component analysis (PCA) and partial least squares discrimination analysis (PLS-DA) showed that the salt stress treatment groups of the higher concentrations (200 mM and 300 mM) could be well distinguished from those of the lower concentrations (50 mM and 100 mM) and the control. Marker metabolites, like m/z 261 (apigravin) and m/z 305 (β-cotonefuran) were assistantly selected from the fingerprints by variable importance for the projection (VIP). Our results indicated the potential of ND-EESI-MS method for the rapid recognition of metabolic conditions in plant leaves under salt stress.

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