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Genetic Manipulation in Δku80 Strains for Functional Genomic Analysis of Toxoplasma gondii

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'Real time' genetic manipulation: a new tool for ecological field studies.

Martin Schäfer¹, Christoph Brütting, Klaus Gase

¹Department of Molecular Ecology, Max Planck Institute for Chemical Ecology, Hans Knöll Strasse 8, Jena, 07745, Germany.

The Plant Journal : for Cell and Molecular Biology

|August 3, 2013

Summary

Researchers developed a new field method for precise gene control in plants, enabling real-time study of plant-herbivore interactions and genetic traits in natural environments.

Keywords:

LhGR Manduca sexta Nicotiana attenuata Tupiocoris notatus cytokinin dexamethasone fieldwork herbivory pOp6 pds technical advance

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Area of Science:

Plant Science
Ecology
Genetics

Background:

Field experiments are crucial for understanding plant performance in natural settings.
Previous methods for gene manipulation in the field lacked precise temporal and dose control.
This limited the study of dynamic genetic traits and ecological interactions.

Purpose of the Study:

To develop a precise, inducible gene expression system for field studies in *Nicotiana attenuata*.
To investigate the role of cytokinin (CK) in plant-herbivore interactions using this new system.
To enable real-time analysis of genetic traits influencing plant performance in nature.

Main Methods:

Application of the dexamethasone (DEX)-inducible pOp6/LhGR expression system in field-grown plants.
Development of a lanolin-based DEX application for localized gene silencing and activation.
Spatially restricted expression of the cytokinin biosynthesis gene *ipt* to elevate CK levels in single leaves.

Main Results:

Successfully achieved localized gene silencing (phytoene desaturase) and activation (*ipt*) in field conditions.
Demonstrated that elevated CK levels in single leaves increased damage by the herbivore *Tupiocoris notatus*.
Confirmed the role of CKs in plant-herbivore interactions at a small spatial scale.

Conclusions:

The developed DEX-inducible system offers precise spatiotemporal control over gene expression in field conditions.
This tool advances the genetic analysis of dynamic traits crucial for plant ecological interactions.
Facilitates a deeper understanding of plant responses to environmental factors and biotic interactions.