Shotgun proteomic analysis of soybean embryonic axes during germination under salt stress
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Date
2016-03-08
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Proteomics
Abstract
Seed imbibition and radicle emergence are generally less affected by salinity in soybean than in
other crop plants. In order to unveil the mechanisms underlying this remarkable salt tolerance
of soybean at seed germination, a comparative label-free shotgun proteomic analysis of embryonic
axes exposed to salinity during germination sensu stricto (GSS) was conducted. The results
revealed that the application of 100 and 200 mmol/L NaCl stress was accompanied by significant
changes (>2-fold, P<0.05) of 97 and 75 proteins, respectively. Most of these salt-responsive
proteins (70%) were classified into three major functional categories: disease/defense response,
protein destination and storage and primarymetabolism. The involvement of these proteins in
salt tolerance of soybean was discussed, and some of them were suggested to be potential salttolerant
proteins. Furthermore, our results suggest that the cross-protection against aldehydes,
oxidative as well as osmotic stress, is the major adaptive response to salinity in soybean.