Abstract
Key message
SbAP37 transcription factor contributes to a combination of abiotic stresses when applied simultaneously in rice. It modulates a plethora of proteins that might regulate the downstream pathways to impart salt stress tolerance.
Abstract
APETALA type of transcription factor was isolated from Sorghum bicolor (SbAP37), overexpressed in rice using a salt inducible abscisic acid 2 (ABA2) promoter through Agrobacterium tumefaciens following in planta method. Transgenics were confirmed by PCR amplification of SbAP37, hygromycin phosphotransferase (hptII) marker and ABA2 promoter and DNA blot analysis. Plants were exposed to 150 mM NaCl coupled with high day/night 36 ± 2/25 ± 2 °C temperatures and also drought stress by withholding water for 1-week separately at the booting stage. SbAP37 expression was 2.8- to 4.7-folds higher in transgenic leaf under salt, but 1.8- to 3.3-folds higher in roots under drought stress. Native gene expression analysis showed that it is expressed more in stem than in roots and leaves under 150 mM NaCl and 6% PEG stress. In the present study, proteomic analysis of transgenics exposed to 150 mM NaCl coupled with elevated temperatures was taken up using quadrupole time-of-flight (Q-TOF) mass spectrometry (MS). The leaf proteome revealed 11 down regulated, 26 upregulated, 101 common (shared), 193 newly synthesized proteins in transgenics besides 368 proteins in untransformed plants. Some of these protein sets appeared different and unique to combined stresses. Our results suggest that the SbAP37 has the potential to improve combined stress tolerance without causing undesirable phenotypic characters when used under the influence of ABA2 promoter.
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Acknowledgements
This work was supported by the UGC, New Delhi (No.F.4-2/2006(BSR)/18-1(3)/2011) and CSIR, New Delhi (No.21(0934)/12/EMR-II), and we are thankful for financial assistance of the projects. MP is thankful to the UGC for providing UGC-RGNF fellowship (F. 14-2(SC)/2010(SA-III). PBK is thankful to the UGC and CSIR, New Delhi for sanctioning UGC-BSR and CSIR-Emeritus fellowships.
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Parveda, M., Kiran, B., Punita, D.L. et al. Overexpression of SbAP37 in rice alleviates concurrent imposition of combination stresses and modulates different sets of leaf protein profiles. Plant Cell Rep 36, 773–786 (2017). https://doi.org/10.1007/s00299-017-2134-z
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DOI: https://doi.org/10.1007/s00299-017-2134-z