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Updated: Aug 21, 2025
09:11
Caffeine Extraction, Enzymatic Activity and Gene Expression of Caffeine Synthase from Plant Cell Suspensions
Published on: October 2, 2018
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Multigenic regulation in the ethylene biosynthesis pathway during coffee flowering
Iasminy Silva Santos1, Thales Henrique Cherubino Ribeiro1, Kellen Kauanne Pimenta de Oliveira1
1Plant Molecular Physiology Laboratory, Biology Department, Federal University of Lavras (UFLA), s/n, Cx., Postal 3037, Lavras, Minas Gerais 37200-900 Brazil.
Summary
Water deficit impacts coffee plant ethylene production, downregulating oxidase (ACO) genes in roots but not affecting synthase (ACS) genes. Leaves are key for ethylene precursor production, regulating flowering.
Area of Science:
- Plant Biology
- Biochemistry
- Molecular Biology
Background:
- Ethylene is a key plant hormone regulating flowering and stress responses.
- Water deficit (WD) affects ethylene biosynthesis enzymes, 1-aminocyclopropane-1-carboxylic acid synthase (ACS) and oxidase (ACO).
- Understanding ethylene regulation is crucial for coffee (Coffea arabica) flowering and stress tolerance.
Purpose of the Study:
- Characterize coffee ACS and ACO gene families.
- Analyze their expression profiles under well-watered (WW) and water deficit (WD) conditions.
- Elucidate the role of ethylene biosynthesis in coffee flowering and drought response.
Main Methods:
- Identification and characterization of ACS and ACO genes in Coffea arabica.
- Quantitative gene expression analysis in leaves, roots, flower buds, and open flowers.
- Comparison of gene expression under WW and WD conditions.
Main Results:
- Three new ACS genes were identified in coffee.
- WD did not alter ACS expression in roots, but strongly downregulated ACO expression.
- ACO expression in floral buds was water-independent, suggesting reproductive organ control.
- Leaves showed high ethylene precursor (ACC) production under WW conditions, potentially supporting anthesis.
Conclusions:
- ACO genes play a major regulatory role in ethylene production in coffee roots and shoots.
- Leaf gene regulation is a key factor in ethylene production linked to coffee flowering.
- A regulatory model for ethylene biosynthesis in coffee flowering is proposed, potentially applicable to other woody species.
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