Abstract
Camelina sativa L. is an emerging biodiesel crop with exceptional cold tolerance. We isolated two small hydrophobic proteins, CsRCI2A and CsRCI2E (rare cold inducible), from Camelina. The proteins displayed high homology with RCI2-related proteins from various species. CsRCI2A contained only two trans-membrane domains but CsRCI2E possessed both trans-membrane domains and a C-terminal tail. Subcellular localization of the two encoded proteins was detected in the plasma membrane and these proteins were induced by salinity stress at 0.2 M NaCl and cold stress at 2 °C. The two genes mediated an early defense to abiotic stresses dependant on the circadian clock. To understand the function of the CsRCI2 proteins, various combinational arrangements of the two genes were transformed into the yeast deletion mutant PMP3. CsRCI2A was able to complement the mutation in yeast under salinity stress (0.5 M NaCl), while CsRCI2E protein was not. However, a truncated version of the protein (CsRCI2E∆58) functionally complemented PMP3. Interestingly, the CsRCI2A+E swapped protein not able to complement to the degree of CsRCI2A, but complemented better than the CsRCI2E protein. A similar pattern was evident concerning restoration of membrane potential in hyperpolarization caused by deletion of PMP3. The results indicate different functions of the CsRCI2A and CsRCI2E proteins in plasma membrane potential regulation during salt stress. The CsRCI2 C-terminal hydrophilic tail likely has a suppressor function and the two hydrophobic domains likely are activators via maintenance of membrane potential.
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Abbreviations
- BTP:
-
1,3-bis(tris[hydroxymethyl]methylamino) Propane
- CsFAD :
-
Flavin adenine dinucleotide gene
- CsRCI2A :
-
Camelina sativa rare cold inducible gene A
- CsRCI2E :
-
Camelina sativa rare cold inducible gene E
- CBF/DREB:
-
C-repeat binding factor/dehydration responsive element binding
- DTT:
-
Dithiothreitol
- HRP:
-
Horseradish peroxidase
- MOPS:
-
3-[N-morpholino] propanesulfonic acid
- OsLti6 :
-
Oryza sativa low temperature inducible gene
- PBST:
-
Phosphate buffered saline–tween 20
- PMP3 :
-
Plasma membrane protein 3
- PVP:
-
Polyvinylpyrrolidine
- RACE:
-
Rapid amplification of cDNA ends
- SSC:
-
Saline-sodium citrate
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This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of education (2014R1A1A4A01009621).
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Kim, HS., Lee, JE., Jang, HY. et al. CsRCI2A and CsRCI2E genes show opposite salt sensitivity reaction due to membrane potential control. Acta Physiol Plant 38, 50 (2016). https://doi.org/10.1007/s11738-016-2072-3
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DOI: https://doi.org/10.1007/s11738-016-2072-3