41 documents found

Nicotiana attenuata (Solanaceae) produces 17-hydroxygeranyllinalool diterpene glycosides (HGL-DTGs) in starch-equivalent concentrations that thwart the growth of its specialist lepidopteran herbivore Manduca sexta (Lepidoptera, Sphingidae). Lyciumoside IV and its malonylated forms, nicotianoside I and...

In this thesis, I investigate the role of the roots in processes which have so far mostly described within leaves. I manipulate gene function in the roots, and ask whether root gene function affects plant responses to above-ground herbivore attack and above-ground herbivore preference. I establish an...

This thesis explores phenotypic plasticity in the interaction of the post-fire annual tobacco Nicotiana attenuata with two herbivores: the lepidopteran folivore Manduca sexta and the hemipteran seed predator Corimelaena extensa. Due to mass-germination after fires, N. attenuata grows under strong intra-specific...

Like most organisms, plants need to keep a daily rhythm to synchronize their inner functions to the available energy and nutrients; even due to its sessile nature it’s especially important for a large group to find ways to reproduce by outcrossing. The endogenous clock regulates metabolic processes related...

This work focuses on the development of statistical methods to select features (genes and metabolites) exhibiting induced local and systemic defense responses to insect attack in Nicotiana attenuata along with the extraction of additional information regarding their timing of action. To characterize...

The wild tobacco species Nicotiana attenuata needs to tailor its defense responses against herbivores and pathogens most efficiently, requiring sophisticated signaling systems to distinguish its individual attackers. One of these signaling components is the phytohormone jasmonic acid (JA) which is produced...

In dieser Arbeit wurden die Kosten der frühen Verteidigungssignalkette, die oberhalb der Jasmonsäure (JA) entstehen, für die pflanzliche Fitness, untersucht. Darüber hinaus wurden die Nachteile der Biosynthese Stickstoff (N)-haltiger Verteidigungsmetabolite für das Wachstum durch die Nutzung einer gemeinsamen...

The Jasmonate-ZIM domain (JAZ) proteins are key repressor of jasmonic acid (JA) signaling in plant. I identified 12 novel JAZ proteins in the native tobacco Nicotiana attenuata The NaJAZ genes showed spatially and temporally different expression patterns after simulated herbivory. N. attenuata plants...

Protein kinases modulate developmental and adaptation processes in the plant kingdom. While MAPK signaling has been intensively studied for the involvement in growth, defense and growth regulation, more and more studies have shown that CDPKs also function in these physiological processes. N. attenuata...

Trichomes represent a first meal for neonate larvae of the tobacco hornworm Manduca sexta and we explored the functions of their exudates and contents in terms of plant defense. We analyzed the composition of O-acyl sugars in Nicotiana attenuata and demonstrated that their mixture is even more complex...