Abstract
Rice (Oryza sativa L.) is a salt-sensitive species. Salt stress can cause injury to the plant cellular membrane. Plant lipid transfer proteins (LTPs) are abundant lipid binding proteins that are important in membrane vesicle biogenesis and trafficking, however, the biological importance of LTPs on salt-stress response in rice remains unclear. Therefore, salt-responsive rice LTPs were identified and characterized in this study. Microarray analysis showed seven genes positively regulated by salinity, including five Ltp genes (LtpII.3, LtpII.5, LtpII.6, LtpV.1, and LtpV.2) and two Ltp-like (LtpL; LtpL1, and LtpL2) genes. Amino acid alignment revealed that all these Ltp and LtpL genes contained the N-terminal signal peptide. Apart from LtpL1, all salt-inducible Ltp genes had the conserved eight cysteine residue motifs backbone. Verification of gene expression to different stimuli in rice seedlings revealed that salt-regulated Ltp genes differentially responded to drought, cold, H2O2, abscisic acid (ABA) and CaCl2. Furthermore, the expression of Ltp and LtpL genes was tissue-specifically regulated by ABA-dependent and independent pathway. In silico analysis of a 1.5-kb 5’-upstream region of these genes showed regulatory cis-elements associated with ABA, calcium, and cold/drought responses. Three LtpII subfamily genes, including LtpII.3, LtpII.5, and LtpII.6, were strictly expressed in flowers and seeds, and LtpIII.1 mRNA strongly accumulated in stem tissue. Subcellular localization analysis of LTP-DsRed fusion proteins revealed that the five LTPs and two LTPLs localized at the endoplasmic reticulum. The results provide new clues to further understanding the biological functions of Ltp genes.
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Abbreviations
- ABA:
-
abscisic acid
- ABRE:
-
ABA-responsive element
- 8-CM:
-
eight-cysteine motif
- DRE/CRT:
-
dehydration-responsive/C-repeat element
- ER:
-
endoplasmic reticulum
- LTPs:
-
lipid transfer proteins
- LtpL:
-
Ltp-like
- MYB:
-
MYB transcription factor recognition sequence
- MYC:
-
MYC transcription factor recognition sequence
- ROS:
-
reactive oxygen species
- ROSE:
-
ROS/oxidative stress-responsive element
- RT:
-
reverse transcription
- TNG67:
-
Tainung 67
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Acknowledgments: We are grateful to the Joint Center for Instruments and Researches of the College of Bioresources and Agriculture at the National Taiwan University for confocal microscopy and technical support. This work was supported by a research grant (MOST 104-2313-B-002 -013 -MY3) from the Ministry of Science and Technology of Taiwan to C.-Y. Hong.
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Lin, KC., Wu, TM., Chandrika, N.N.P. et al. Molecular characterization and subcellular localization of salt-inducible lipid transfer proteins in rice. Biol Plant 61, 501–510 (2017). https://doi.org/10.1007/s10535-016-0671-x
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DOI: https://doi.org/10.1007/s10535-016-0671-x