ArticleScientific reports2021
High planting density induces the expression of GA3-oxidase in leaves and GA mediated stem elongation in bioenergy sorghum.
Article in Scientific reports, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers.
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8 citing papers in PubMed, 14 citations in OpenAlex.
- Small Signaling Peptides inPlant direct · 2026Article
- Toward Breeding by Gene Design: Constructing the Ideotype ofPlants (Basel, Switzerland) · 2026Review
- Bioenergy sorghum stem density increases threefold following internode elongation due to continued accumulation of lignified cell walls and complex regulation of genes involved in cell wall biosynthesis.Biotechnology for biofuels and bioproducts · 2025Article
- Divergent Mechanisms of Internode Elongation in Response to Far-Red in Two Rose Genotypes.Plants (Basel, Switzerland) · 2025Article
- Transcriptome sequencing revealed the regulation of stem internode length associated with mechanical harvesting in three tea varieties.Frontiers in plant science · 2025Article
- A MYB transcription factor underlying plant height in sorghum qHT7.1 and maize Brachytic 1 loci.The Plant journal : for cell and molecular biology · 2024Article
- Bulbil initiation: a comprehensive review on resources, development, and utilisation, with emphasis on molecular mechanisms, advanced technologies, and future prospects.Frontiers in plant science · 2024Review
- Strigolactones modulate stem length and diameter of cherry rootstocks through interaction with other hormone signaling pathways.Frontiers in plant science · 2023Article
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Authors and funding
4 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The stems of bioenergy sorghum hybrids at harvest are > 4 m long, contain > 40 internodes and account for ~ 80% of harvested biomass. In this study, bioenergy sorghum hybrids were grown at four planting densities (~ 20,000 to 132,000 plants/ha) under field conditions for 60 days to investigate the impact shading has on stem growth and biomass accumulation. Increased planting density induced a > 2-fold increase in sorghum internode length and a ~ 22% decrease in stem diameter, a typical shade avoidance response. Shade-induced internode elongation was due to an increase in cell length and number of cells spanning the length of internodes. SbGA3ox2 (Sobic.003G045900), a gene encoding the last step in GA biosynthesis, was expressed ~ 20-fold higher in leaf collar tissue of developing phytomers in plants grown at high vs. low density. Application of GA3 to bioenergy sorghum increased plant height, stem internode length, cell length and the number of cells spanning internodes. Prior research showed that sorghum plants lacking phytochrome B, a key photoreceptor involved in shade signaling, accumulated more GA1 and displayed shade avoidance phenotypes. These results are consistent with the hypothesis that increasing planting density induces expression of GA3-oxidase in leaf collar tissue, increasing synthesis of GA that stimulates internode elongation.
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