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.

Download the abstract

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…

Experiments with the use of stems in Pinot noir winemaking

Vinification trials were carried out between 2018 and 2021 in the experimental winery at Laimburg Research Centre, Alto Adige, to test the effect of grape stem inclusion during fermentation of Pinot Noir.

Read More

Data fusion approaches for sensory and multimodal chemistry data applied to storage conditions

The need to combine multimodal data for complex samples is due to the different information captured in each of the techniques (modes).

Read More

Monitoring the establishment of a synthetic microbial community with a potential biocontrol activity against grapevine downy mildew using a microfluidic qPCR chip

Grapevine downy mildew, caused by the oomycete Plasmopara viticola, is responsible for significant economic losses each year and for a large proportion of the fungicides used in viticulture.

Read More

Reduced berry skin epi-cuticular wax and cutin accumulation associates with a genomic deletion and increased polyphenols extractability in a clone of Tempranillo Tinto 

Tempranillo Tinto (TT) is the third-most planted red wine variety in the world, and it is mostly grown in the Iberian Peninsula. Spontaneous somatic variation appearing during vegetative propagation can be exploited to improve elite varieties as Tempranillo Tinto, including the selection of new phenotypes enhancing berry quality. We described previously that a somatic variant of TT with darker fruit color, the clone VN21, exhibits increased extractability of polyphenols during the winemaking process. To unravel the molecular mechanism underlying this phenomenon, we performed whole-genome resequencing to compare VN21 to other TT clones, revealing a 10 Mb deletion in chromosome 11 that likely affected only the L1 meristem cell layer of VN21 and tissues derived from it, such as external cell layers of berry skin.

Read More

Fingerprinting the origin of rosé wines with a new high throughput polyphenomics method

Wine is a widely consumed alcoholic beverage with a high commercial value. More specifically, the worldwide consumption of rosé wine has increased by 20% since 2002[1]. But because of its high commercial value, it can become a subject of fraud, and authenticity control is necessarily required. More than one hundred polyphenols have been recently quantified in various rosé wines [2]. They are key components defining color, taste and quality of wines. Their amount and composition depend on many different factors such as grape variety, winemaking and age of the wine. In this study, the influence of geographic origin of some rosé French wines was investigated. An original and very fast UPLC-QTOF-MS method was developed and used to predict the geographic origin authenticity of rosé wines.

Read More