Cited by 76Plant Stress Responses and ToleranceResearch in Cotton CultivationPlant Molecular Biology Research

Functional characterization of gh_a08g1120 (gh3.5) gene reveal their significant role in enhancing drought and salt stress tolerance in cotton

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Kirungu, Joy Nyangasi, Magwanga, Richard Odongo, Lu, Pu, Cai, Xiaoyan, Zhou, Zhongli, Wang, Xingxing, Peng, Renhai, Wang, Kunbo +1 more·2019·BMC Genetics

Abstract

BACKGROUND: Auxins play an important role in plant growth and development; the auxins responsive gene; auxin/indole-3-acetic acid (Aux/IAA), small auxin-up RNAs (SAUR) and Gretchen Hagen3 (GH3) control their mechanisms. The GH3 genes function in homeostasis by the catalytic activities in auxin conjugation and bounding free indole-3-acetic acid (IAA) to amino acids. RESULTS: In our study, we identified the GH3 genes in three cotton species; Gossypium hirsutum, Gossypium arboreum and Gossypium raimondii, analyzed their chromosomal distribution, phylogenetic relationships, cis-regulatory element function and performed virus induced gene silencing of the novel Gh_A08G1120 (GH3.5) gene. The phylogenetic tree showed four clusters of genes with clade 1, 3 and 4 having mainly members of the GH3 of the cotton species while clade 2 was mainly members belonging to Arabidopsis. There were no paralogous genes, and few orthologous genes were observed between Gossypium and other species. All the GO terms were detected, but only 14 genes were found to have described GO terms in upland cotton, more biological functions were detected, as compared to the other functions. The GH3.17 subfamily harbored the highest number of the cis-regulatory elements, most having promoters towards dehydration-responsiveness. The RNA expression analysis revealed that 10 and 8 genes in drought and salinity stress conditions respectively were upregulated in G. hirsutum. All the genes that were upregulated in plants under salt stress conditions were also upregulated in drought stress; moreover, Gh_A08G1120 (GH3.5) exhibited a significant upregulation across the two stress factors. Functional characterization of Gh_A08G1120 (GH3.5) through virus-induced gene silencing (VIGS) revealed that the VIGS plants ability to tolerate drought and salt stresses was significantly reduced compared to the wild types. The chlorophyll content, relative leaf water content (RLWC), and superoxide dismutase (SOD) concentration level were reduced significantly while malondialdehyde concentration and ion leakage as a measure of cell membrane stability (CMS) increased in VIGS plants under drought and salt stress conditions. CONCLUSION: This study revealed the significance of the GH3 genes in enabling the plant's adaptation to drought and salt stress conditions as evidenced by the VIGS results and RT-qPCR analysis.

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Crossref · 10.1186/s12863-019-0756-6

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  • Suppressing the GhA08G1120 (GH3.5) gene in cotton resulted in enhanced drought and salt stress tolerance.

    “One prominent example is the study focusing on the GhA08G1120 (GH3.5) gene in cotton. Researchers demonstrated that suppressing this gene resulted in enhanced drought and salt stress tolerance (Kirungu et al., 2019).”

    From Emerging applications of gene editing technologies for the development of climate-resilient crops (2025) · cites this paper as Kirungu et al., 2019

    The Discussion says that knocking down Gh_A08G1120 compromised cotton’s ability to tolerate drought and salt stress—the opposite of the claim. The Results likewise say silencing significantly reduced stress tolerance. Page numbers are not provided in our copy. (LLM, conf=0.95)

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  • GH3.5 manipulation led to increased proline accumulation, which plays a role in osmotic adjustment and detoxification of ROS.

    “The GH3.5 gene is involved in auxin metabolism, and its manipulation led to increased proline accumulation, which plays a crucial role in osmotic adjustment and the detoxification of reactive oxygen species (ROS).”

    From Emerging applications of gene editing technologies for the development of climate-resilient crops (2025) · cites this paper as Kirungu et al., 2019

    The Results section states that proline contributes to osmotic adjustment and ROS detoxification, and the Background links GH3 genes to auxin metabolism. The paper is internally inconsistent about the effect of GH3.5 silencing: the Discussion says silenced plants had higher proline, whereas the Results say their proline levels were significantly lower than wild-type plants under drought and salt stress. It therefore does not consistently support the claim that manipulation increased proline. (LLM, conf=0.86)

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Authors
Kirungu, J. N., Magwanga, R. O., Lu, P., Cai, X., Zhou, Z., Wang, X., Peng, R., Wang, K., & Liu, F.
Affiliations
  • Chinese Academy of Agricultural Sciences (CN)
  • Jaramogi Oginga Odinga University of Science and Technology (KE)
  • Anyang Institute of Technology (CN)
Corresponding author
Liu, Fang
Venue
BMC Genetics
Published
2019-07-23
Volume
20
Issue
1
Pages
62-62
ISSN
1471-2156 (ISSN-L)
OpenAlex
W2963963718
Cited by
76
References
77
Citations by year
2026: 5 · 2025: 13 · 2024: 8 · 2023: 14 · 2022: 13 · 2021: 21 · 2020: 2
FWCI
6.64
Type
journal article
Language
en
Open access
Locations
  • BMC Genetics (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • National Natural Science Foundation of China (31671745, 31530053))
  • National key research and development plan (2016YFD0100306)
Topics
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Stress Responses and Tolerance
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Research in Cotton Cultivation
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Molecular Biology Research
Keywords
Gossypium hirsutum, cotton, drought tolerance, salt tolerance, auxin conjugation, virus-induced gene silencing, cis-regulatory elements, phylogenetic analysis, oxidative stress, membrane stability
MeSH terms
Chromosome Mapping, Gossypium, Phylogeny, Plant Proteins, Regulatory Sequences, Nucleic Acid, Stress, Physiological, Gene Expression Regulation, Plant, Genome, Plant, Computational Biology, Salt Tolerance, Droughts, Molecular Sequence Annotation, Transcriptome

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