Abstract
Key message
The overexpression of LKP2 confers dehydration tolerance in Arabidopsis thaliana ; this is likely due to enhanced expression of dehydration-inducible genes and reduced stomatal opening.
Abstract
LOV KELCH PROTEIN 2 (LKP2) modulates the circadian rhythm and flowering time in plants. In this study, we observed that LKP2 overexpression enhanced dehydration tolerance in Arabidopsis. Microarray analysis demonstrated that expression of water deprivation-responsive genes was higher in the absence of dehydration stress in transgenic Arabidopsis plants expressing green fluorescent protein–tagged LKP2 (GFP-LKP2) than in control transgenic plants expressing GFP. After dehydration followed by rehydration, GFP-LKP2 plants developed more leaves and roots and exhibited higher survival rates than control plants. In the absence of dehydration stress, four dehydration-inducible genes, namely DREB1A, DREB1B, DREB1C, and RD29A, were expressed in GFP-LKP2 plants, whereas they were not expressed or were expressed at low levels in control plants. Under dehydration stress, the expression of DREB2B and RD29A peaked faster in the GFP-LKP2 plants than in control plants. The stomatal aperture of GFP-LKP2 plants was smaller than that of control plants. These results suggest that the dehydration tolerance of GFP-LKP2 plants is caused by upregulation of DREB1A–C/CBF1–3 and their downstream targets; restricted stomatal opening in the absence of dehydration stress also appears to contribute to the phenotype. The rapid and high expression of DREB2B and its downstream target genes also likely accounts for some features of the GFP-LKP2 phenotype. Our results suggest that LKP2 can be used for biotechnological applications not only to adjust the flowering time control but also to enhance dehydration tolerance.
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Acknowledgments
We thank Dr. K. Shimazaki (Kyushu University) and Dr. T. Kinoshita (Nagoya University) for their suggestions on the measurement of stomatal aperture. This research was partially supported by a fund from Ministry of Education, Culture, Sports, Science and Technology of Japan.
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Communicated by P. Lakshmanan.
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299_2015_1746_MOESM1_ESM.tif
Supplemental Fig. S1 Sixteen-day-old Arabidopsis plants (GFP-LKP2, lines 1 and 2; control, Col and GFP) grown in the absence of dehydration stress. (A) Plants grown on GM agar plates. (B) Leaf and root numbers of these plants (n = 10; mean ± SE). Different letters indicate statistical difference (p < 0.05, Student–Newman–Keuls test) (TIFF 2097 kb)
299_2015_1746_MOESM2_ESM.tif
Supplemental Fig. S2 Stomatal aperture of GFP-LKP2 (lines 1 and 2) and control (Col and GFP) plants at ZT20 under long-day (16-h light/8-h dark) conditions (n = 20; mean ± SE; p < 0.05, Student–Newman–Keuls test) (TIFF 101 kb)
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Miyazaki, Y., Abe, H., Takase, T. et al. Overexpression of LOV KELCH PROTEIN 2 confers dehydration tolerance and is associated with enhanced expression of dehydration-inducible genes in Arabidopsis thaliana . Plant Cell Rep 34, 843–852 (2015). https://doi.org/10.1007/s00299-015-1746-4
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DOI: https://doi.org/10.1007/s00299-015-1746-4