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Expression of an Expansin Gene Is Correlated with Root Elongation in Soybean
Open accessAbstract
Expansin is a family of proteins that catalyze long-term expansion of cell walls and has been considered a principal protein that affects cell expansion in plants. We have identified the first root-specific expansin gene in soybean (Glycine max),GmEXP1, which may be responsible for root elongation. Expression levels of GmEXP1 were very high in the roots of 1- to 5-d-old seedlings, in which rapid root elongation takes place. Furthermore, GmEXP1 mRNA was most abundant in the root tip region, where cell elongation occurs, but scarce in the region of maturation, where cell elongation ceases, implying that its expression is closely related to root development processes. In situ hybridization showed that GmEXP1 transcripts were preferentially present in the epidermal cells and underlying cell layers in the root tip of the primary and secondary roots. Ectopic expression ofGmEXP1 accelerated the root growth of transgenic tobacco (Nicotiana tabacum) seedlings, and the roots showed insensitivity to obstacle-touching stress. These results imply that theGmEXP1 gene plays an important role in root development in soybean, especially in the elongation and/or initiation of the primary and secondary roots.
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Similar GO classification results have been recently demonstrated for sweetpotato and other root transcriptomes, including rice, wild rice and Avena barbata, supporting the quality of our Georgia Jet sweetpotato root transcriptome data.
“Similar results have been recently demonstrated for sweetpotato [19-21] and other root transcriptomes, including rice [25], wild rice [26] and Avena barbata[27], supporting the quality of our Georgia Jet sweetpotato root transcriptome data.”
From Transcriptional profiling of sweetpotato (Ipomoea batatas) roots indicates down-regulation of lignin biosynthesis and up-regulation of starch biosynthesis at an early stage of storage root formation (2013) · cites this paper as [21]
The sections on soybean expansin cDNAs and GmEXP1 expression in roots examine individual genes, not GO classifications of root transcriptomes. Searches for sweetpotato, rice, wild rice, Avena barbata, and Gene Ontology transcriptome classification found no passage addressing the attributed comparison. Page numbers were not available in our copy. (LLM, conf=0.77)
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References 65 · Cited by 187
Metadata
- Authors
- Lee, D.-K., Ahn, J. H., Song, S.-K., Choi, Y. D., & Lee, J. S.
- Affiliations
- Seoul National University (KR)
- Venue
- Plant Physiology
- Publisher
- Oxford University Press (OUP)
- Published
- 2003-03-01
- Volume
- 131
- Issue
- 3
- Pages
- 985-997
- ISSN
- 0032-0889 (ISSN-L)
- 1532-2548
- PMC
- PMC166864
- OpenAlex
- W2027481395
- Cited by
- 187
- References
- 65
- Citations by year
- 2026: 3 · 2025: 9 · 2024: 13 · 2023: 10 · 2022: 15 · 2021: 4 · 2020: 12 · 2019: 10 · 2018: 6 · 2017: 4 · 2016: 10 · 2015: 5 · 2014: 13 · 2013: 13 · 2012: 4
- FWCI
- 10.26
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model (vor)
- Locations
- PLANT PHYSIOLOGY (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Kyung Hee University
- Korea Science and Engineering Foundation
- Topics
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Molecular Biology Research
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Polysaccharides and Plant Cell Walls
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant nutrient uptake and metabolism
- Keywords
- expansin, soybean, root elongation, root development, root tip, cell wall expansion, gene expression, epidermal cells, transgenic tobacco, root growth
- MeSH terms
- Cell Division, Multigene Family, Molecular Sequence Data, Plant Proteins, RNA, Messenger, Glycine max, Nicotiana, In Situ Hybridization, Sequence Analysis, DNA, DNA, Complementary, Gene Expression Regulation, Plant, Gene Expression Regulation, Developmental, Plant Roots, Plant Epidermis, Soybean Proteins, Plants, Genetically Modified
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