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.

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…

Volatile Organic Compound markers of Botrytis cinerea infection in artificially inoculated intact grape berries

The addition of partially dehydrated grapes to enrich must composition for producing complex dry/sweet wines represents a traditional practice in several regions of the world. However, the environmental conditions of dehydration chambers may facilitate the infection of Botrytis cinerea Pers. by promoting disease and provoking large grape losses. B. cinerea attack can induce alterations in the profile of volatile organic compounds (VOCs), which could be detected by sensors specifically trained to detect infection/disease-related compounds. These sensors could facilitate the early detection of the infection, consequently allowing to adjust some dehydration parameters.

Impact of microclimate on berry quality parameters of white Riesling (Vitis vinifera L.)

Knowledge has been accumulated on the impact of microclimate, in particular berry temperature and irradiation, for a wide range of red varieties. However, little research has been dedicated on the effects of the same factors on the quality of white grape varieties.

Prospects of thermal imaging as a non-invasive tool to assess water status for irrigation scheduling in commercial vineyards

Aim: Irrigated viticulture is expanding worldwide mainly as a short-term adaptation strategy to climate change. Plant-based methods are increasingly being used for irrigation scheduling in commercial vineyards. Canopy temperature (TC) has long been recognized as an indicator of plant water status. TC, but also the thermal stress indices, e.g. crop water stress index (CWSI) and stomatal

A 4D high resolution vineyard soil assessment for soil-hydrological interpretation in combination with automated data analysis and visualization to manage site-specific grape and wine quality

A Visual Information eNvironment for Effective agricultural management and Sustainability (VINES) is under development, which can provide significant competitive advantages to winegrowers by sustaining their appellation-specific grape and wine qualities and yields while measurably conserving water resources.

Crossed approaches to experimental economics and sensory analysis regarding noble rot sweet wines perception

Noble rot sweet wines are reputed wines, traditionally elaborated according to a singular vinification process involving the harvesting of overripe grapes under the action of the ascomycete fungus Botrytis cinerea.