Abstract
Arabidopsis glucuronokinase (AtGlcAK), as a member of the GHMP kinases family, is implicated in the de novo synthesis of UDP-glucuronic acid (UDP-GlcA) by the myo-inositol oxygenation pathway. In this study, two T-DNA insertion homozygous mutants of AtGlcAK, atglcak-1 and atglcak-2, were identified. AtGlcAK was highly expressed in roots and flowers. There was reduced primary root elongation and lateral root formation in atglcak mutants under osmotic stress. The atglcak mutants displayed enhanced stomatal opening in response to abscisic acid (ABA), elevated water loss and impaired drought tolerance. Under water stress, the accumulation of reducing and soluble sugars was reduced in atglcak mutants, and the metabolism of glucose and sucrose was affected by the synthetic pathway of UDP-GlcA. Furthermore, a reduced level of starch in atglcak mutants was observed under normal conditions. The phylogenetic analysis suggested that GlcAK was conserved in numerous dicots and monocots plants. In short, AtGlcAK mutants displayed hypersensitivity to ABA and reduced root development under water stress, rendering the plants more susceptible to drought stress.
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Acknowledgments
This research was supported by grants from the National Key Laboratory of Plant Molecular Genetics (2015), the National Natural Science Foundation of China (31540064, 31071076 and 30871325), the Ph.D. Programs Foundation of Ministry of Education of China (20130161110005), Hunan Provincial Innovation Foundation For Postgraduate (CX2015B073, CX2016B097), and Key Research & Development project of Hunan Provincial Department of Science and Technology support (2016WK2003).
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Wenjun Xiao and Shuai Hu contributed equally to this work.
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Supplemental Fig. 1
a Identification of T-DNA events in the two mutant lines. LP/RP was Left/Right genomic primer. LB was Left border primer of the T-DNA insertion. M indicated DNA maker III. b Sequencing of the insertional site. The green and blue boxes meant the T-DNA insertional sites of atglcak-1 and atglcak-2, respectively. The fragment marked in red lower cases was the UTR region. ATG was the star codon of AT3G01640. c Expression analysis of AtGlcAK and AtGALK2 in WT and mutant plants under drought condition. (JPEG 1.13 MB)
Supplemental Fig. 2
a Parameter of rosette leaves (RLs). Long axis was shown in black and short axis in gray. b Weight of shoots harvested from 30-day-old plants. Values are means ± SD. Asterisks indicated statistically significant differences compared with WT (Student’s t test,*P < 0.05, **P < 0.01). (JPEG 111 KB)
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Xiao, W., Hu, S., Zhou, X. et al. A glucuronokinase gene in Arabidopsis, AtGlcAK, is involved in drought tolerance by modulating sugar metabolism. Plant Mol Biol Rep 35, 298–311 (2017). https://doi.org/10.1007/s11105-017-1023-5
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DOI: https://doi.org/10.1007/s11105-017-1023-5