Association analysis of grapevine bunch traits using a comprehensive approach
Javier Tello1, Rafael Torres-Pérez1, Jérôme Grimplet1
1Departamento de Viticultura, Instituto de Ciencias de la Vid y del Vino (ICVV, CSIC-Universidad de La Rioja-Gobierno de La Rioja), Carretera de Burgos km 6. Finca La Grajera, 26007, Logroño, Spain.
Summary
Researchers identified single nucleotide polymorphism (SNP) markers linked to grapevine bunch compactness and related traits. These findings offer potential for marker-assisted selection to improve grape quality and health.
Area of Science:
- Plant genetics
- Genomics
- Bioinformatics
Background:
- Grapevine bunch compactness is crucial for grape quality and health but its genetic basis is largely unknown.
- Understanding the genetic factors influencing bunch compactness is essential for improving table and wine grape varieties.
Purpose of the Study:
- To identify molecular markers associated with grapevine bunch compactness and related traits.
- To explore the genetic underpinnings of variation in bunch compactness using transcriptomic and association analyses.
Main Methods:
- Transcriptomic analysis of loose and compact grapevine clones to identify candidate genes.
- Sequencing of 183 genes in over 100 grapevine varieties to detect single nucleotide polymorphisms (SNPs).
- Association analysis of 7032 SNPs with bunch compactness, berry number, and rachis ramification length over three seasons.
Main Results:
- A small number of SNPs were associated with berry number, indicating high sensitivity to environmental factors.
- Several SNPs in previously unrelated genes were significantly associated with rachis ramification length and bunch compactness across multiple seasons.
- Identified novel candidate genes for bunch compactness and related traits.
Conclusions:
- A set of SNP markers associated with grapevine bunch compactness and related traits were identified.
- These markers represent valuable candidates for future functional studies and marker-assisted selection strategies in grapevine breeding.
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