Plants are not exposed to herbivores without defenses. When an insect feeds on a leaf, thereby wounding it and releasing oral secretions, a signaling cascade is elicited in the plant, usually starting with a rapid increase in the amount of the plant hormone jasmonic acid and its active isoleucine conjugate. Jasmonic acid regulates various reactions in plants, including defenses against herbivores and responses to environmental stress.
and the conclusion that mutants with disadvantageous properties disappear again. However, researchers at the Max Planck Institute for Chemical Ecology in Jena have made observations on the wild tobacco species Nicotiana attenuata, also known as coyote tobacco, that contradict this prediction.with tobacco plants muted in their defense signals in their natural environment, the Great Basin desert in the U.S. state of Utah.
To test this hypothesis, Ian Baldwin's team developed what is called a MAGIC population, which captures a large portion of the genetic diversity of the entire Nicotiana attenuata species in a breeding population with a homogenized genetic background.
In addition, the researchers demonstrated that the mutation in this single gene responsible for plant defense signaling is maintained in a population for at least 10 years, and a robust genetic network can buffer the deficit in defense, allowing the mutants to survive in nature.
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