terclim by ICS banner
IVES 9 IVES Conference Series 9 Reduced bunch compactness in a clone of Tempranillo associates with a complex reciprocal translocation detected by long-read sequencing genomics

Reduced bunch compactness in a clone of Tempranillo associates with a complex reciprocal translocation detected by long-read sequencing genomics

Abstract

Grapevine cultivars are vegetatively propagated to maintain their varietal attributes. However, spontaneous somatic variation emerges during prolonged periods of vegetative growth, providing an opportunity for the natural improvement of traditional grapevine cultivars. Notably, reduction in bunch compactness is a favorable trait in viticulture, offering advantages such as decreased susceptibility to bunch fungal diseases, and a more uniform ripening of berries. To unravel the genetic and developmental mechanisms behind bunch compactness variation, we examined a somatic variant of Tempranillo Tinto cultivar with loose bunches. We found that the mutant clone exhibits a ~50% reduction in pollen viability compared to typical Tempranillo clones. By aligning Illumina and Nanopore whole-genome sequencing reads to a diploid genome assembly of Tempranillo, we identified genome structural variations (SV) specific of this clone: translocation events involving chromosomes 1-3, 7-11, and 8-17. The presence of the SV breakpoints was validated using PCR and Sanger sequencing. The analysis of self-cross progeny of the mutant clone showed that low pollen viability and reduced number of seeds per berry co-segregate with the SV event between specific haplotypes of chromosomes 1 and 3, suggesting a causal effect for this rearrangement. Inspection of Nanopore read alignments identified that the SV 1-3 event corresponds to a complex reciprocal translocation with duplications at the breakpoints of the two involved chromosomes. Considering that heterozygous reciprocal translocations associate with partially incompatible chromosome pairing during meiosis, we propose that this type of SV decreases fruit set rate by lowering gamete viability, ultimately reducing bunch compactness.

Download the abstract

DOI:

Publication date: June 14, 2024

Issue: Open GPB 2024

Type: Article

Authors

Pablo Carbonell-Bejerano1*, Noelia Alañón1, Yolanda Ferradás1,2, Nuria Mauri1,3, José Miguel Martínez-Zapater1, Javier Ibáñez1*

1 Instituto de Ciencias de la Vid y del Vino (ICVV, CSIC-CAR-UR), Departamento de Viticultura, Logroño, Spain
2 Departamento de Biología Funcional, Universidad de Santiago de Compostela, Santiago de Compostela, Spain
3 Centre for Research in Agricultural Genomics (CSIC-IRTA-UAB-UB), Cerdanyola del Vallès, Barcelona, Spain

Contact the author*


Keywords

bunch compactness, clonal variation, genome structural variation, pollen viability, reciprocal translocation

Tags

IVES Conference Series | Open GPB | Open GPB 2024

Citation

Related articles…

Étude de la flore levurienne de différents terroirs alsaciens

L’utilisation de levures sélectionnées est généralement considérée comme le moyen d’éviter les problèmes fermentaires. Néanmoins de nombreux viticulteurs pensent que ces levures sont à l’origine d’une standardisation des vins et militent pour le respect d’une flore indigène (Bourguignon, 1992).

Read More

A meta-analysis of the ecological impact of viticultural practices on soil biodiversity

Viticulture is facing two major challenges – climate change and agroecological transition. The soil plays a pivotal role in these transition processes. Therefore, soil quality and adequate soil management are key levers for an ecologically and economically sustainable viticulture. Over the last 15 years, numerous studies evidenced strong effects of viticultural practices on the soil physical, chemical and biological quality. However, to date a global analysis providing a comprehensive overview of the ecological impacts of viticultural practices on soil biological quality is missing.

Read More

Influenza delle componenti climatiche e pedologiche sulla variabilità dei contenuti polifenolici in alcuni ambienti vitati della DOCG Sagrantino di Montefalco

Obiettivo del progetto è la valutazione dell’influenza climatica e pedologica dell’areale di Montefalco sul vitigno Sagrantino, ponendo particolare attenzione alla componente polifenolica e antocianica. Sono stati quindi messi a confronto, a partire dal 2001 fino al 2008, sei differenti zone tutte situate all’interno dell’areale DOCG Sagrantino di Montefalco; per ciascun vigneto alla vendemmia sono state effettuate analisi sui parametri analitici e sul contenuto polifenolico e antocianico delle uve. Ognuna delle sei zone è inoltre stata caratterizzata dal punto di vista pedoclimatico, valutando l’influenza del clima e della tipologia di suolo sui parametri analitici presi in considerazione.

Read More

Projections of vine phenology and grape composition of Tempranillo variety In Rioja DOCa (Spain) under climate change

Aims: Some of the most direct effects of climate variability on grapevines are the changes in the onset and timing of phenological events and in the length of the growing season, which may affect grape quality. The aim of this research was to analyze the projected changes in vine phenology and on grape composition of the Tempranillo variety in Rioja DOCa under different climate change scenarios.

Read More

Enological impact of vineyard application of methyl jasmonate–loaded chitosan nanoparticles on ethanol reduction and wine quality preservation

Viticultural practices aimed at producing lower‑alcohol wines have traditionally focused on reducing sugar accumulation in grapes through canopy management techniques—such as early leaf removal or shading—which limit photosynthetic activity and delay ripening (Palliotti et al., 2014).

Read More