Abstract
Abscisic acid (ABA) is an important phytohormone involved in the regulation of plant growth, development and adaption to various environmental challenges. Regulatory component of ABA receptor 1 (RCAR1, also known as PYL9) acts as a newly discovered ABA receptor in Arabidopsis. To identify interacting partners of RCAR1, we have carried out a yeast two-hybrid screen. One protein was identified, ArathEULS3, which belongs to the Euonymus europaeus lectin (EUL) family of plant lectins. The interaction between RCAR1 and ArathEULS3 was confirmed by GST pull-down assay. Transient expression of RCAR1-EGFP and ArathEULS3-EGFP in Arabidopsis protoplasts revealed that both proteins were mainly expressed in cytoplasm and nucleus. Real time qRT-PCR analysis showed that over-expression of RCAR1 increased the expression of ArathEULS3. Furthermore, up-regulating ArathEULS3 in Arabidopsis conferred ABA hypersensitivity during post-germination growth and enhanced drought tolerance, but did not affect the expression of RD29B, RAB18 and RD29A (ABA- and drought-responsive genes). Previously, ArathEULS3 was shown as a carbohydrate-binding plant lectin. Thus, our results reveal a direct connection between abiotic stress responses and plant lectin.
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Abbreviations
- ABA:
-
Abscisic acid
- CPK3:
-
Calcium dependent protein kinase 3
- ABAR:
-
Abscisic acid receptor
- CHLH:
-
Mg-chelatase H subunit
- PYR:
-
Pyrabactin resistance
- PYL:
-
PYR1-like
- ABI1:
-
ABA-insensitive 1
- ABI2:
-
ABA-insensitive 2
- SnRK2.6:
-
SNF1-related protein kinase 2.6
- ABF2:
-
ABRE-binding factor 2
- AREB1:
-
ABA-responsive element binding protein 1
- LD-PCR:
-
Long-distance PCR
- PP2C:
-
Type 2C protein phosphatase
- DAPI:
-
4′,6-Diamidino-2-phenylindole
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Acknowledgments
This work was supported by Grants from the National Natural Science Foundation of China (31171586 to Y.Y.; 31271758 to J-M.W.), National 973 Project (2013CB733903 to Y.Y.) and National Transgene Project (2013ZX08009-003 to J-M.W.).
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Li, D., Wang, X., Yuan, D. et al. Over-expression of ArathEULS3 confers ABA sensitivity and drought tolerance in Arabidopsis . Plant Cell Tiss Organ Cult 117, 431–442 (2014). https://doi.org/10.1007/s11240-014-0453-0
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DOI: https://doi.org/10.1007/s11240-014-0453-0