terclim by ICS banner
IVES 9 IVES Conference Series 9 Open-GPB 9 Open-GPB-2024 9 Flash - New biotechnological tools 9 Enhancing hydric stress tolerance by editing the VviMYB60 promoter with CRISPR/Cas9 

Enhancing hydric stress tolerance by editing the VviMYB60 promoter with CRISPR/Cas9 

Abstract

Climate change presents increasing challenges to viticulture, particularly with rising water stress contributing significantly to yield losses and damages. The identification of the MYB60 transcription factor, which regulates stomatal opening and closing in Arabidopsis thaliana and Vitis vinifera, offers potential solutions. Notably, knockout studies in Arabidopsis have shown reduced stomatal opening and increased drought tolerance in myb60 mutants. Additionally, the grapevine ortholog, VviMYB60, can restore the wild-type phenotype of Arabidopsis myb60 mutants. Further investigation of the Arabidopsis promoter region has revealed that mutations in DOF motifs lead to reduced expression of AtMYB60.

Utilizing the advancements in CRISPR/Cas9 genome editing, this project aims to modify the VviMYB60 promoter region to lower gene expression, thereby reducing stomatal opening in grapevines. Binary vectors for genome editing were constructed to target two specific regions of the VviMYB60 promoter. Agrobacterium-mediated transformation was performed on Chardonnay embryogenic calli, resulting in the successful regeneration of plants under selection conditions. Sanger sequencing analysis of the targeted region confirmed the occurrence of genetic edits in four of the six lines analyzed so far.

To further characterize the edited lines, next-generation sequencing will be utilized, providing a more comprehensive understanding of the mutations, as well as gene expression of VviMYB60 will be evaluated to confirm that the editing reduces its expression. Morphological and physiological parameters will be measured after acclimatation in greenhouse and finally these edited lines will undergo drought tolerance testing to assess their performance.

DOI:

Publication date: June 13, 2024

Issue: Open GPB 2024

Type: Article

Authors

Manuela Campa1*, Loredana Moffa2, Luca Nerva2, Walter Chitarra2, Johan Burger1

1 Genetics Department, Faculty of Agrisciences, Stellenbosch University, 7600 Stellenbosch, South Africa
2 Research Centre for Viticulture and Enology, Council for Agricultural Research and Economics (CREA-VE), Via XXVIII Aprile 26, 31015 Conegliano (Italy)

Contact the author*

Keywords

CRISPR/Cas9, VviMYB60, promoter, drought tolerance, stomatal regulation

Tags

IVES Conference Series | Open GPB | Open GPB 2024

Citation

Related articles…

Climate modeling at local scale in the Waipara winegrowing region in the climate change context

In viticulture, a warming climate can have a very significant impact on grapevine development and therefore on the quality and characteristics of wines across different spatial scales, ranging from global to local. In order to adapt wine-growing to climate change, global climate models can be used to define future scenarios, but only at the scale of major wine regions. Despite the huge progress made over the last ten years in terms of the spatial resolution of climate models (now downscaled to a few square kilometres), they are not yet sufficiently precise to account for the local climate variability associated with such parameters as local topography, in spite of these parameters being decisive for vine and wine characteristics. This study describes a method to downscale future climate scenarios to vineyard scale. Networks of data loggers have been used to collect air temperature at canopy level in the Waipara winegrowing region (New Zealand) over five growing seasons. These measurements allow the creation of fine-scale geostatistical models and maps of temperature (at 100 m resolution) for the growing season. In order to model climate change at pilot site scale, these geostatistical models have been combined with regional climate change predictions for the periods 2031-2050 and 2081-2100 based on the RCP8.5 climate change scenario. The integration of local climate variability with regionalized climate change simulations allows assessment of the impacts of climate change at the vineyard scale. The improved knowledge gained using this methodology results from the increased horizontal resolution that better addresses the concerns of winegrowers. The results provide the local winegrowers with information necessary to understand current processes, as well as historical and future viticulture trends at the scale of their site, thereby facilitating decisions about future response strategies.

Do wine lees derived biomolecule mixtures lead to enhancing the grapevine innate immunity? A metabolomic study on Vitis vinifera leaves

Downy mildew (Plasmopara viticola) is one of the most devastating diseases of Vitis vinifera.

A new step toward the comprehensive valorisation of grape marc through subcritical water extraction of polysaccharides

Winemaking generates a significant amount of waste. Grape marc, the main solid residue, constitutes 20-25% of the pressed grapes and approximately 8-9 million tons are produced globally each year.

MICROFLUIDIC PLATFORM FOR SORTING YEAST CELLS ACCORDING TO THEIR MORPHOLOGY

In this work we briefly present a microfluidic device aiming to sort yeast cells according to their morphology. The technology is based upon microfluidic chips made out of Polydimethylsiloxane and glass using soft lithography processes and replica molding. The microfluidic device was used for encapsulating single yeast cells in liquid droplets containing growth medium. Liquid droplet containing yeast cells were sorted using a real time imaging and decision-making process.

Use of cyclodextrins to improve grape must fermentability thanks to their sequestering effect on medium-chain fatty acids

Cyclodextrins are complex cyclic oligosaccharides of glucose units. They are produced from the breakdown of starch by the enzymatic reaction of glucosyltransferase. The result is a ring-shaped molecule with a cavity with a hydrophilic outer part and a hydrophobic inner part. As a consequence of this cavity, cyclodextrin is able to form complexes with non-polar organic molecules [1,2].