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…

On the losses of dissolved CO2 during champagne aging

A misconception lingers in the minds of some wine consumers that Champagne wines don’t age. It’s largely a myth, certainly as far as the best cuvees are concerned. Actually, during the so-called autolysis period of time (in the closed bottle, after the “prise de mousse”), complex chemical reactions take place when the wine remains in contact with the dead yeast cells, which progressively bring complex and very much sought-after aromas to champagne. Nevertheless, despite their remarkable impermeability to liquid and air, caps or natural cork stoppers used to cork the bottles are not 100% hermetic with regard to gas transfers. Gas species therefore very slowly diffuse through the cap or cork stopper, along their respective inverse partial pressure. After the “prise de mousse”, because the partial pressure of CO2 in the bottleneck reaches up to 6 bars (at 12 °C), gaseous CO2 progressively diffuse from the bottle to the ambient air
(where the partial pressure of gaseous CO2 is only of order of 0,0004 bar).

Environmental protection by means of (“Great”) vitiviniculture zonation

In the paper is discussed the first example of environmental protection, agreed in a wide term sense, by means of vitiviniculture zonations performed in Istria (Croatia) in the area of Butoniga lake

Environmental influence on grape phenolic and aromatic compounds in a Nebbiolo selection (Vitis vinifera L.)

Nebbiolo (Vitis vinifera L.) is one of the most important wine red cultivar of North-west Italy. A better understanding of the complex relations among grape aromatic and phenolic maturity and environmental factors may strongly contribute to the improvement of the quality of Nebbiolo wines.

Herbicide-free systems based on under-the-row grass cover in French vineyards

In a context of reducing herbicide use, the most part of French vineyards are developing permanent grass cover crops on inter-rows alleys, while under the row chemical weeding remains the general case. The setting up of a controlled grass cover crop under the vine row could be a complementary alternative to mechanical weeding – which one is very restrictive – interesting from a technical and economical point of view. The present study aimed at assessing agronomic impacts of grass cover crop under the row in different climatic conditions and production objectives.

THE ODORIFEROUS VOLATILE CHEMICALS BEHIND THE OXIDATIVE AROMA DEGRADATION OF SPANISH RED WINES

It is a well-established fact that premature oxidation is noxious for wine aromatic quality and longevity. Although some oxidation-related aroma molecules have been previously identified, there are not works carrying out systematic research about the changes in the profiles of odour-active volatiles during wine oxidation.