terclim by ICS banner
IVES 9 IVES Conference Series 9 Enhancing plant defense: carbon dots for efficient spray-induced gene silencing 

Enhancing plant defense: carbon dots for efficient spray-induced gene silencing 

Abstract

Ectopic RNA application for plant defense faces challenges in tree crops, including size, diffusion, and stability of active compounds such as ribonucleoproteins and nucleic acids. While existing strategies involve expressing dsRNA in transgenic plants targeting pathogens, our research strives to develop a transient RNAi system based on Spray-Induced Gene Silencing (SIGS). This approach aims to circumvent legal barriers and public concerns associated with genetically modified organisms (GMOs). Our strategy integrates SIGS with branched polyethyleneimine-functionalized Carbon Dots (bPEI-CDs) as nanocarriers, effectively addressing unique delivery challenges in plant defense as RNA stability and uptake enhancement. We developed a cost-effective microwave-assisted protocol for the synthesis of 10 nm monodispersed bPEI-CDs. These molecules showed over 50% dsRNA protection against RNase III degradation at a 200:1 (w/w) ratio. We further demonstrated their capability to enhance cellular uptake by successfully delivering fluorolabeled-dsRNAs (Cy3-RNA) complexed with CDs into intact plant tissue-cultured cells. Notably, Cy3-RNA sprayed with CD on the surface of greenhouse grapevine leaves through a low-pressure spray application penetrated stomata cells and neighboring cells. Ultimately, the ability of dsRNA complexed with CD to trigger RNA interference was confirmed using a 21 nucleotide-dsRNA targeting eGFP . Ongoing work quantitatively compares, through qPCR, the reduced expression of GFP on eGFP-expressing transgenic microvine leaves sprayed with CD-complexed and naked siRNA. This innovative approach, leveraging CDs, aims to tackle critical barriers in dsRNA delivery, particularly by addressing cell wall-related limitations in plant. This research marks a pivotal step in optimizing RNA-based grapevine defense strategies, and propelling sustainable viticulture practices forward.

DOI:

Publication date: June 13, 2024

Issue: Open GPB 2024

Type: Poster

Authors

Christian Mandelli1*, Laurent G. Deluc1,2

1 Department of Horticulture, Oregon State University, Corvallis, OR, United States
2 Oregon Wine Research Institute, Oregon State University, Corvallis, OR, United States

Contact the author*

Keywords

RNA interference, Spray-Induced Gene Silencing (SIGS), Carbon dots, dsRNA delivery, Sustainable agriculture

Tags

IVES Conference Series | Open GPB | Open GPB 2024

Citation

Related articles…

Cold plasma at atmospheric pressure for eliminating Brettanomyces from oak wood

In the oenological industry, the maintenance and sanitation of oak barrels has become a fundamental task. The wood has a porous structure that facilitates the penetration not only of the wine, but of the microorganisms it contains, such as the alterative yeast Brettanomyces bruxellensis.

The effect of ultrasounds in syrah wine quality is not dependent on the ripening or sanitary status of the grapes

Different studies have demonstrated that the application of ultrasounds (US) to crushed grapes improves chromatic characteristics of the wines (1,2), increases their polysaccharide content (3) and some aroma compounds are also favored (4,5)

Early likovrisi: the new white very early table grape seedless and resistant variety

This paper presents is the create, the study and ampelographic description the new «Early Likovrisi», that was created (2014) in Greece by Pantelis Zamanidis.

YEAST-PRODUCED VOLATILES IN GRAPE BASED SYSTEM MODEL ACTING AS ANTIFUNGAL BIOAGENTS AGAINST PHYTOPATHOGEN BOTRYTIS CINEREA

Botrytis cinerea Pers., the causal agent of grey mould disease, is responsible for substantial economic losses, as it causes reduction of grape and wine quality and quantity. Exploitation of antagonistic yeasts is a promising strategy for controlling grey mould incidence and limiting the usage of synthetic fungicides. In our previous studies, 119 different indigenous yeasts were screened for putative multidimensional modes of action against filamentous fungus B. cinerea [1]. The most promissing biocontrol yeast was Pichia guilliermondii ZIM624, which exhibited several anatagonistic traits (production of cell wall degrading enzymes, chitinase and β-1,3-glucanase; demonstration of in vitro inhibitory effect on B. cinerea mycelia radial growth; production of antifungal volatiles, assimilation of a broad diversity of carbon sources, contributing to its competitivnes in inhabiting grapes in nature).

Wood from barrique: release of phenolic compounds and permeability to oxygen

Chemical and sensory changes occurring in red wine during ageing in oak barrique are due to the slow and gradual entrance of oxygen along with a release of ellagic tannin from the wood. Though oxygen can enter the cask through the bunghole, it is not clear the role of permeation through the wood staves as well as the amount of oxygen entering by permeation. The distribution of the released ellagic tannins in the wine ageing is also unknown. The oxygen passing through the bunghole may have a different wine ageing effect compared to the oxygen permeating through the wooden staves owing to the uneven ellagic tannin concentration throughout the wine.