Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Comparing four heat-inducible promoters in stably transformed sugarcane regarding spatial and temporal control of transgene expression reveals candidates to drive stem-preferred transgene expression

Journal Article · · Frontiers in Plant Science
 [1];  [1]
  1. Univ. of Florida, Gainesville, FL (United States); Center for Advanced Bioenergy and Bioproducts Innovation (CABBI), Urbana, IL (United States)

Small heat shock protein (sHSP) promoters contain cis-regulatory elements that facilitate transcription in response to heat stress, making them valuable tools for functional studies through controlled gene expression and the precise regulation of gene-editing tools or morphogenic regulators. To evaluate their utility, GUS reporter gene expression driven by four plant-sourced HSP promoters (pGmHSP17.5, pHvHSP17, pZmHSP17.7, and pZmHSP26) was compared across various tissues of stably transformed sugarcane before and after heat treatment. At 22°C, all promoters showed minimal activity in leaves and roots, although pZmHSP17.7 and pHvHSP17 displayed moderate expression in stems. Following heat treatment, all promoters exhibited their highest activity in stems, followed by leaves and roots. In stem tissues, pGmHSP17.5 displayed heat-induced uidA expression comparable to the constitutive pZmUbi promoter. Notably, heat-induced reporter gene activity in stem middle sections of single-copy transgenic lines containing pZmHSP17.7, pHvHSP17, or pZmHSP26 exceeded pZmUbi-derived uidA activity by 9.7-fold, 3.8-fold, and 3.0-fold, respectively, with 346- to 3,672-fold induction compared to control conditions. Most promoters showed peak expression in the middle sections of the stem, while pHvHSP17 was the most active in the stem apices. Histochemical analysis revealed that pZmHSP17.7 and pHvHSP17 were active in both parenchyma cells and vascular bundles within sugarcane stems. Among leaf tissues, mature leaves exhibited greater expression than senescing or immature leaves, while root activity remained consistently minimal across all promoters. Temperature-course experiments identified distinct activation thresholds: 34°C–36°C for pZmHSP17.7, 36°C for pZmHSP26, 36°C–38°C for pHvHSP17, and 40°C–42°C for pGmHSP17.5. Drought stress also induced reporter gene transcription in stems under HSP promoters, although with lower fold induction than heat treatment. These findings provide valuable tools for gene function studies and biotechnology applications, including heat stress tolerance research, controlled transgene expression in metabolic engineering, precision gene editing, and developmental biology studies.

Research Organization:
Univ. of Illinois at Urbana-Champaign, IL (United States); Univ. of Florida, Gainesville, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); USDA National Institute of Food and Agriculture
Grant/Contract Number:
SC0018420
OSTI ID:
3006325
Journal Information:
Frontiers in Plant Science, Journal Name: Frontiers in Plant Science Vol. 16; ISSN 1664-462X
Publisher:
Frontiers Research FoundationCopyright Statement
Country of Publication:
United States
Language:
English

References (67)

GUS fusions: beta-glucuronidase as a sensitive and versatile gene fusion marker in higher plants. journal December 1987
Heat‐shock‐inducible CRISPR/Cas9 system generates heritable mutations in rice journal May 2019
Alfalfa heat shock genes are differentially expressed during somatic embryogenesis journal June 1991
Development of a heat shock inducible expression cassette for plants: Characterization of parameters for its use in transient expression assays journal June 1990
Differential regulation of small heat-shock genes in plants: analysis of a water-stress-inducible and developmentally activated sunflower promoter journal July 1996
Developmental regulation and tissue-specific differences of heat shock gene expression in transgenic tobacco and Arabidopsis plants journal April 1995
Homology-dependent gene silencing in transgenic plants: epistatic silencing loci contain multiple copies of methylated transgenes journal May 1994
TM2, a novel strong matrix attachment region isolated from tobacco, increases transgene expression in transgenic rice calli and plants journal January 2005
Specimen block counter-staining for localization of GUS expression in transgenic arabidopsis and tobacco journal July 2002
Enhanced tolerance to drought stress in transgenic rice plants overexpressing a small heat-shock protein, sHSP17.7 journal October 2007
Co-integration, co-expression and inheritance of unlinked minimal transgene expression cassettes in an apomictic turf and forage grass (Paspalum notatum Flugge) journal August 2008
Enhanced heat and drought tolerance in transgenic rice seedlings overexpressing OsWRKY11 under the control of HSP101 promoter journal September 2008
Characterization of Small Heat Shock Proteins Associated with Maize Tolerance to Combined Drought and Heat Stress journal May 2010
The activities of four constitutively expressed promoters in single-copy transgenic rice plants for two homozygous generations journal March 2015
Effects of heat shock and salinity on barley growth and stress-related gene transcription journal September 2015
Generation of a selectable marker free, highly expressed single copy locus as landing pad for transgene stacking in sugarcane journal March 2019
Analysis of transgene integration and expression following biolistic transfer of different quantities of minimal expression cassette into sugarcane (Saccharum spp. hybrids) journal September 2011
Expression of selected heat shock proteins after individually applied and combined drought and heat stress journal March 2011
Improved FLP Recombinase, FLPe, Efficiently Removes Marker Gene from Transgene Locus Developed by Cre–lox Mediated Site-Specific Gene Integration in Rice journal January 2011
Heat-inducible Cre-lox system for marker excision in transgenic rice journal March 2011
Importance of heat shock proteins in maize journal June 2011
Functional analysis of the temperature-dependent expression of the barley Hvhsp17 gene promoter in monocot and dicot cell systems journal March 1995
The effect of heat stress and cadmium ions on the expression of a small hsp gene in barley and maize journal July 2005
Protein sHSP26 improves chloroplast performance under heat stress by interacting with specific chloroplast proteins in maize (Zea mays) journal February 2015
Efficient Gene Targeting in Maize Using Inducible CRISPR-Cas9 and Marker-free Donor Template journal August 2020
A small heat shock protein CaHsp25.9 positively regulates heat, salt, and drought stress tolerance in pepper (Capsicum annuum L.) journal September 2019
Role of plant heat-shock proteins and molecular chaperones in the abiotic stress response journal May 2004
A Golden Gate Modular Cloning Toolbox for Plants journal February 2014
HSFA1a modulates plant heat stress responses and alters the 3D chromatin organization of enhancer-promoter interactions journal January 2023
Hsp42 is the general small heat shock protein in the cytosol of Saccharomyces cerevisiae journal January 2004
Ethanol treatment triggers a heat shock‐like response but no thermotolerance in soybean (Glycine max cv. Kaohsiung No.8) seedlings journal October 2000
Tissue‐specific expression of sunflower heat shock proteins in response to water stress journal December 1993
Heat‐inducible expression of FLP gene in maize cells journal August 1995
A small heat shock protein stably binds heat-denatured model substrates and can maintain a substrate in a folding-competent state journal February 1997
Hsp26: a temperature-regulated chaperone journal December 1999
Tissue-10Hvhsp17gene promoter in transgenic tobacco plants journal January 1996
PlantCARE, a database of plant cis-acting regulatory elements and a portal to tools for in silico analysis of promoter sequences journal January 2002
Rapid isolation of high molecular weight plant DNA journal January 1980
PlantPAN3.0: a new and updated resource for reconstructing transcriptional regulatory networks from ChIP-seq experiments in plants journal November 2018
PlantRegMap: charting functional regulatory maps in plants journal November 2019
The Expression of Small Heat Shock Proteins in Seeds Responds to Discrete Developmental Signals and Suggests a General Protective Role in Desiccation Tolerance journal April 2000
Cloning, Sequence Analysis, and Expression of a cDNA Encoding a Plastid-Localized Heat Shock Protein in Maize journal August 1990
High-level transgene expression in plant cells: effects of a strong scaffold attachment region from tobacco. journal May 1996
Towards oilcane: Engineering hyperaccumulation of triacylglycerol into sugarcane stems journal May 2020
Molecular responses of plants to an increased incidence of heat shock journal October 1991
Thirty years of plant transformation technology development journal March 2007
Temporal and spatial control of transgene expression using a heat‐inducible promoter in transgenic wheat journal January 2011
Vacuolar targeting of r-proteins in sugarcane leads to higher levels of purifiable commercially equivalent recombinant proteins in cane juice journal July 2015
Heat stress induction of miR398 triggers a regulatory loop that is critical for thermotolerance in Arabidopsis journal April 2013
Localization of Small Heat Shock Proteins to the Higher Plant Endomembrane System journal January 1993
Regulatory Domains of the Gmhsp17.5-E Heat Shock Promoter of Soybean journal August 1989
Identification, characterization, and analysis of cDNA and genomic sequences encoding two different small heat shock proteins in Hordeum vulgare journal December 1993
The Roles of Heat Shock Proteins in Plants journal June 1991
Solar Heating (Solarization) of Soil for Control of Soilborne Pests journal September 1981
Expression and Promoter Analysis of Six Heat Stress‐Inducible Genes in Rice journal January 2013
A heat-shock inducible system for flexible gene expression in cereals journal October 2020
Intron-mediated enhancement of DIACYLGLYCEROL ACYLTRANSFERASE1 expression in energycane promotes a step change for lipid accumulation in vegetative tissues journal October 2023
Wheat Chloroplast Targeted sHSP26 Promoter Confers Heat and Abiotic Stress Inducible Expression in Transgenic Arabidopsis Plants journal January 2013
Back to the basics: the molecular blueprint of plant heat stress transcription factors journal April 2025
Identification, Characterization and Expression of Drought Related alpha‐Crystalline Heat Shock Protein Gene (GHSP26) from Desi Cotton journal November 2007
Potential for Genetic Improvement of Sugarcane as a Source of Biomass for Biofuels journal November 2015
High-Level Production of Recombinant Snowdrop Lectin in Sugarcane and Energy Cane journal August 2020
Crop Production under Drought and Heat Stress: Plant Responses and Management Options journal June 2017
An Efficient Gene Excision System in Maize journal September 2020
Sequential Genome Editing and Induced Excision of the Transgene in N. tabacum BY2 Cells journal November 2020
Transcriptional Regulatory Network of Plant Cadmium Stress Response journal February 2023
Mechanisms of Plant Epigenetic Regulation in Response to Plant Stress: Recent Discoveries and Implications journal January 2024