Abstract
SbHRGP3 encodes an HRGP whose expression is correlated with the cessation of root elongation in soybean. The wound-inducible expression of SbHRGP3 interestingly requires sucrose although wounding alone induces the expression of many HRGP genes. To examine whether sugar serves as a specific signal on the wound-inducible expression or whether sugar is required to provide ATP, we examined SbHRGP3::GUS expression in transgenic tobacco plants. Various oligosaccharides including non-metabolizable sugar induced SbHRGP3::GUS expression in transgenic plants. The inhibitors of photosynthesis and of cellular respiration did not affect the wound-inducible expression of SbHRGP3::GUS. However, the induction was significantly affected by PCMBS, an inhibitor of active apoplastic phloem loading of sucrose, suggesting that SbHRGP3::GUS expression in phloem tissues requires translocated sucrose. We therefore propose that sugar acts as a specific regulatory signal on the wound-inducible expression of SbHRGP3, rather than acting as a simple provider of ATP.
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Abbreviations
- ATP:
-
Adenosine triphosphate
- DCMU:
-
3-(3,4-Dichlorophenyl)-1,1-dimethylurea
- DTT:
-
Dithiothreitol
- HRGP:
-
Hydroxyproline-rich glycoprotein
- GUS:
-
β-Glucuronidase
- MU:
-
4-Methylumbelliferone
- MUG:
-
4-Methylumbelliferyl ß-glucuronide
- PCMBS:
-
p-Chloromercuribenzenesulphonic acid
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Acknowledgements
We thank Seung Kwan Yoo and Jeong Hwan Lee for their comments on this manuscript. We are also grateful to two anonymous reviewers for their perceptive comments. This research was supported by a grant from the Plant Metabolism Research Centre of Kyung Hee University (J. S. L.), a grant from Plant Signalling Network Research Centre of Korea University (J. H. A), and a grant from the Crop Functional Genomics Centre of the 21C Frontier Program of the Ministry of Science and Technology of Korea (J. H. A. and J. S. L.).
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Communicated by I.S. Chung
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Ahn, J.H., Lee, J.S. Sugar acts as a regulatory signal on the wound-inducible expression of SbHRGP3::GUS in transgenic plants. Plant Cell Rep 22, 286–293 (2003). https://doi.org/10.1007/s00299-003-0685-7
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DOI: https://doi.org/10.1007/s00299-003-0685-7