Grape Varieties for Stress Resistance

Jenn Hoskins
8th August, 2024

Grape Varieties for Stress Resistance

Pierce's disease severity in grapevines is assessed using a visual rating scale (0–5) that progresses from no symptoms (0) through increasing leaf scorch and symptom coverage (1–4) to vine death with characteristic matchstick leaf stems (5), providing a standardized method for evaluating disease resistance in Vitis species and their hybrids.

Image adapted from: Arif Atak / CC BY (Source)

Key Findings

  • Researchers at Bursa Uludağ University explored the potential of wild Vitis species in grapevine breeding
  • Wild Vitis species from China and North America show strong resistance to pests, diseases, and environmental stresses
  • These wild species can be used to develop new grape cultivars that are resilient and require fewer chemical treatments
The study conducted by researchers at Bursa Uludağ University[1] delves into the remarkable potential of wild Vitis species in grapevine breeding programs. These species, native to regions like China and North America, have demonstrated resilience to various biotic (living) and abiotic (non-living) stress conditions, making them invaluable in developing new grape cultivars. This research focuses on transferring resistance genes from these wild species into hybrid genotypes, significantly accelerating the breeding process. The historical context of utilizing North American Vitis species in viticulture dates back to the 19th century when pests and diseases from North America devastated European vineyards. Species such as Vitis riparia, V. berlandieri, and V. rupestris were incorporated into rootstock breeding programs to combat these threats[2]. These rootstocks have since become naturalized in various regions, including Mediterranean floodplains, where they exhibit invasive characteristics and hybridize with native species. The current study builds on this foundation by leveraging advancements in biotechnology to create interspecific hybrids with enhanced resistance to both biotic and abiotic stresses. This approach is not limited to pest and disease resistance; it also encompasses tolerance to environmental stressors such as drought and extreme temperatures. The genetic diversity within Vitis species is a crucial asset, as it allows breeders to select and transfer specific resistance genes into new cultivars more efficiently. Previous research has highlighted the ecological impact of naturalized rootstocks in Europe. For instance, studies in the Rhône watershed revealed that naturalized rootstock populations primarily thrive in alluvial forests and exhibit higher genetic diversity than native European wild grapevines[3]. These rootstocks form hybrid swarms, which could potentially accelerate the decline of native wild grapevines due to genetic pollution. The findings of the current study underscore the importance of managing these hybrid populations to preserve native biodiversity while benefiting from their resilience traits. The role of wild Vitis species in breeding programs is further supported by studies on the Danube floodplain, where a significant proportion of grapevines are true wild species, with a smaller percentage being hybrids[4]. These hybrids often establish in disturbed areas, indicating their adaptive advantage in dynamic environments. The current study's focus on developing hybrids with specific resistance traits aligns with these observations, as it aims to produce cultivars that can thrive in diverse and changing conditions. Another critical aspect of the study is the analysis of phenolic compounds in grape cultivars and hybrids. Phenolic compounds, such as gallic acid, catechin, and epicatechin, play a vital role in plant defense mechanisms against diseases like powdery and downy mildew[5]. The study found that hybrids and cultivars with higher phenolic content exhibited increased resistance to these fungal diseases. This insight is crucial for developing new grape varieties that are both high-quality and disease-resistant, reducing the need for chemical treatments and supporting sustainable viticulture. In conclusion, the research conducted by Bursa Uludağ University highlights the transformative potential of wild Vitis species in grapevine breeding programs. By harnessing their genetic diversity and resistance traits, breeders can develop new cultivars that are resilient to various stress conditions, ensuring sustainable and cost-effective grape production. This study not only builds on historical findings but also paves the way for future innovations in viticulture.

AgricultureGeneticsPlant Science

References

Main Study

1) Vitis species for stress tolerance/resistance

Published 7th August, 2024

https://doi.org/10.1007/s10722-024-02106-z

Related Studies

2) Ecology and Genetics of Natural Populations of North American Vitis Species Used as Rootstocks in European Grapevine Breeding Programs.

https://doi.org/10.3389/fpls.2020.00866

3) Naturalised Vitis rootstocks in Europe and consequences to native wild grapevine.

Journal: PloS one, Issue: Vol 2, Issue 6, Jun 2007

4) Insights into the Vitis complex in the Danube floodplain (Austria).

https://doi.org/10.1002/ece3.3187

5) Changes in Major Phenolic Compounds of Seeds, Skins, and Pulps from Various Vitis spp. and the Effect of Powdery and Downy Mildew Diseases on Their Levels in Grape Leaves.

https://doi.org/10.3390/plants10122554


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