Cited by 179Plant Molecular Biology ResearchPlant Parasitism and ResistanceFlowering Plant Growth and Cultivation

Overexpression of a Knotted -Like Homeobox Gene of Potato Alters Vegetative Development by Decreasing Gibberellin Accumulation

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Rosin, Faye M., Hart, Jennifer K., Horner, Harry T., Davies, Peter J., Hannapel, David J.·2003·Plant Physiology

Abstract

Potato (Solanum tuberosum) homeobox 1 (POTH1) is a class I homeobox gene isolated from an early-stage tuber cDNA library. The RNA expression pattern ofPOTH1, unlike that of most other class Iknotted-like homeobox genes, is widespread in the cells of both indeterminate and differentiated tissues. Using in situ hybridization, POTH1 transcripts were detected in meristematic cells, leaf primordia, and the vascular procambium of the young stem. Overexpression of POTH1 produced dwarf plants with altered leaf morphology. Leaves were reduced in size and displayed a “mouse-ear” phenotype. The mid-vein was less prominent, resulting in a palmate venation pattern. The overall plant height of overexpression lines was reduced due to a decrease in internode length. Levels of intermediates in the gibberellin (GA) biosynthetic pathway were altered, and the bioactive GA, GA1, was reduced by one-half in sense mutants. Accumulation of mRNA for GA 20-oxidase1, a key biosynthetic enzyme, decreased in overexpression lines. In vitro tuberization was enhanced under both short- and long-day photoperiods in several POTH1 overexpression lines. Sense lines produced more tubers at a faster rate than controls. These results imply that POTH1 mediates the development of potato by acting as a negative regulator of GA biosynthesis.

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Crossref · 10.1104/pp.102.015560

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Authors
Rosin, F. M., Hart, J. K., Horner, H. T., Davies, P. J., & Hannapel, D. J.
Affiliations
  • Interdepartmental Program in Molecular, Cellular, and Developmental Biology (F.M.R., D.J.H.),
  • Interdepartmental Genetics Major (J.K.H., D.J.H.),
  • Iowa State University (US)
  • Cornell University (US)
Venue
Plant Physiology
Published
2003-05-01
Volume
132
Issue
1
Pages
106-117
ISSN
  • 0032-0889 (ISSN-L)
  • 1532-2548
OpenAlex
W2089856609
Cited by
179
References
88
Citations by year
2026: 7 · 2025: 6 · 2024: 4 · 2023: 2 · 2022: 16 · 2021: 12 · 2020: 5 · 2019: 4 · 2018: 5 · 2017: 6 · 2016: 2 · 2015: 13 · 2014: 12 · 2013: 7 · 2012: 5
FWCI
11.00
Type
journal article
Language
en
Open access
Locations
  • PLANT PHYSIOLOGY (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Iowa State University Digital Repository (Iowa State University) (submittedVersion)
Funders
Iowa State University
Topics
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Molecular Biology Research
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Parasitism and Resistance
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Flowering Plant Growth and Cultivation
Keywords
potato, gibberellin biosynthesis, vegetative growth, leaf morphology, tuberization, dwarfism, internode length, gene overexpression
MeSH terms
Gibberellins, Molecular Sequence Data, Phenotype, Phylogeny, Plant Proteins, Solanum tuberosum, RNA, Messenger, Blotting, Northern, In Situ Hybridization, Homeodomain Proteins, Gene Expression Regulation, Plant, Gene Expression Regulation, Developmental, Plants, Genetically Modified

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