terclim by ICS banner
IVES 9 IVES Conference Series 9 Open-GPB 9 Open-GPB-2024 9 Flash - New biotechnological tools 9 Deciphering the function and regulation of VviEPFL9 paralogs to modulate stomatal density in grapevine through New Genomic Techniques

Deciphering the function and regulation of VviEPFL9 paralogs to modulate stomatal density in grapevine through New Genomic Techniques

Abstract

Stomata are microscopic pores mainly located in leaf epidermis, allowing gas exchanges between plants and atmosphere. Stomatal initiation relies on the transcription factor SPEECHLESS which is mainly regulated by the MAP kinase cascade, in turn controlled by small signaling peptides, the Epidermal Patterning Factors (EPF and EPF-Like), namely EPF1, EPF2 and EPFL9. While EPF1 and EPF2 induce the inhibition of SPEECHLESS, their antagonist, EPFL9, stabilizes it, leading to stomatal formation. In grapevine, there are two paralogs for EPFL9, VviEPFL9-1 and VviEPFL9-2. Despite their structural similarity, it remains unclear whether they are differentially regulated and have distinct roles. In our study we showed that while VviEPFL9-1 is expressed only in the apex, VviEPFL9-2 is expressed both in the apex and in mature leaves along the plant axis and is significantly repressed by ABA. To support experimental data, an in-silico transcriptomic analysis has been carried out using publicly available datasets. In addition, both genes were functionally characterized using knock-out (KO) mutants generated via CRISPR/Cas9. Leaf stomatal density and gas exchange parameters were significantly different between ‘Sugraone’ WT plants and VviEPFL9-2 KO lines, whereas the differences were negligible between WT and VviEPFL9-1 KO lines. Moreover, a water stress experiment was carried out to deeply compare the physiology of edited lines and WT plants under drought conditions. Our results suggest that VviEPFL9 paralogs have distinct roles in determining stomatal plasticity during leaf growth, and that VviEPFL9-2 may be considered a key target to increase grapevine resilience to water deficiency.

DOI:

Publication date: June 13, 2024

Issue: Open GPB 2024

Type: Article

Authors

Umar Shahbaz1,2, Pierre Videau3, Katerina Labonova3, David Navarro-Payá4, Alvaro Vidal1,2, José Tomás Matus4, Mickael Malnoy1, Olivier Zekri3, Fabio Fiorani5, Michele Faralli2, Lorenza Dalla Costa1*

1 Research and Innovation Centre, Fondazione Edmund Mach, San Michele all’Adige, Italy
2 Center Agriculture Food Environment (C3A), University of Trento, 38098, San Michele all’Adige, Italy
3 Novatech, Mercier Groupe, Le Champ des Noels, France
4 Institute for Integrative Systems Biology, Universitat de València-CSIC,46980 Paterna, Valencia, Spain
5 Institute of Bio- and Geo-Sciences, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany

Contact the author*

Keywords

Vitis vinifera, Epidermal Patterning Factors, CRISPR/Cas9, gas exchange, water stress

Tags

IVES Conference Series | Open GPB | Open GPB 2024

Citation

Related articles…

Rootstocks of prestigious Bordeaux vineyards: implications on quality and yield

Rootstocks have been used in most of the vineyards for over a century. This may seem to be a long period, but it represents only three successive plantations.

Cell-to-cell contact modulates Starmerella bacillaris early death in mixed fermentations with Saccharomyces cerevisiae in a couple-dependent way

AIM: The diversity and complexity of the fermentation ecosystem during wine making limits the successful prediction of wine characteristics. The use of selected starter cultures has allowed a better control of the fermentation process and the production of wines with established characteristics. Among them, the use of mixed fermentations with Starmerella bacillaris and Saccharomyces cerevisiae yeasts has gained attention in recent years due to the fructophylic nature of the first and the ability of this inoculation protocol to reduce the acetic acid and ethanol content of the wines.

Symbiotic microorganisms application in vineyards: impacts on grapevine performance and microbiome

Microorganism-based inoculants have been suggested as a viable solution to mitigate the adverse effects of climate change on viticulture. However, the actual effectiveness of these inoculants when applied under field conditions remains a challenge, and their effects on the existing soil microbiota are still uncertain. This study investigates the impact of arbuscular mycorrhizal fungi inoculation on grapevine performance and microbiome. The study was conducted in a vineyard of Callet cultivar in Binissalem, Mallorca, Spain. Two different treatments were applied: control and inoculation with commercial mycorrhizae complex of Rhizoglomus irregulare applied to plants through irrigation.

Socioeconomic impact of the LIFE Climawin project from the perspective of employees

This study examines, from the perspective of the employees at Bosque de Matasnos—a demonstrative winery participating in the LIFE Climawin project—the socioeconomic impact and potential contributions of the initiative to the wine sector and the sustainable development of the Ribera del Duero region in Spain.

Utility of leaf removal timing and irrigation amounts on grape berry flavonoids under climate change

Context and purpose of the study – The dormant and growing season temperatures in California USA have been increasing with more clear sky days. A consequence increasing temperatures and clear sky days is water deficit conditions. Viticulturists must determine appropriate balances of canopy management and irrigation budgeting to produce suitable yields without compromising berry chemistry. In response, a study designed to test the interactive effects of leaf removal timing and applied water amounts on Cabernet Sauvignon/110R in Napa Valley, CA.