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Institute
- Julius-von-Sachs-Institut für Biowissenschaften (203) (remove)
Sonstige beteiligte Institutionen
- Fraunhofer IGB Stuttgart (1)
- GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel (1)
- Julius-von-Sachs-Institut für Biowissenschaften Lehrstuhl für Botanik II - Ökophysiologie und Vegetationsökologie (1)
- Westfälische Hochschule Recklinghausen, Fachbereich für Ingenieur- und Naturwissenschaften (FB 8) (1)
A part of the plant kingdom consists of a variety of carnivorous plants. Some trap their prey
using sticky leaves, others have pitfall traps where prey cannot escape once it has fallen inside.
A rare trap type is the snap-trap: it appears only twice in the plant kingdom, in the genera
Aldrovanda and Dionaea. Even Charles Darwin himself described Dionaea muscipula, the
Venus flytrap, with the following words “This plant, commonly called Venus' fly-trap, from the
rapidity and force of its movements, is one of the most wonderful in the world”. For a long
time now, the mechanisms of Dionaea’s prey recognition, capture and utilization are of
interest for scientists and have been studied intensively.
Dionaea presents itself with traps wide-open, ready to catch insects upon contact. For this,
the insect has to touch the trigger hairs of the opened trap twice within about 20-30 seconds.
Once the prey is trapped, the trap lobes close tight, forming a hermetically sealed “green
stomach”.
Until lately, there was only limited knowledge about the molecular and hormonal mechanisms
which lead to prey capture and excretion of digestive fluids. It is known that the digestion
process is very water-consuming; therefore, the interplay of digestion-inducing and digestion inhibiting
substances was to be analyzed in this work, to elucidate the fine-tuning of the
digestive pathway. Special attention was given to the impact of phytohormones on mRNA
transcript levels of digestion-related proteins after various stimuli as well as their effect on
Dionaea’s physiological responses.
Jasmonic acid (JA) and its isoleucine-conjugated form, JA-Ile, are an important signal in the
jasmonate pathway. In the majority of non-carnivorous plants, jasmonates are critical for the
defense against herbivory and pathogens. In Dionaea, this defense mechanism has been
restructured towards offensive prey catching. One question in this work was how the
frequency of trigger hair bendings is related to the formation of jasmonates and the induction
of the digestion process. Upon contact of a prey with the trigger hairs in the inside of the trap,
the trap closes and jasmonates are produced biosynthetically. JA-Ile interacts with the COI1-
receptor, thereby activating the digestion pathway which leads to the secretion of digestive
fluid and production of transporters needed to take up prey-derived nutrients. In this work it
could be shown that the number of trigger hair bendings is positively correlated with the level
and duration of transcriptional induction of several digestive enzymes/hydrolases.
Abscisic acid (ABA) acts, along with many other functions, as the plant “drought stress
hormone”. It is synthesized either by roots as the primary sensor for water shortage or by
guard cells in the leaves. ABA affects a network of several thousand genes whose regulation
prepares the plant for drought and initiates protective measurements. It was known from
previous work that the application of ABA for 48 hours increased the required amount of
trigger hair bendings to achieve trap closure. As the digestion process is very water-intensive,
the question arose how exactly the interplay between the jasmonate- and the ABA-pathway
is organized, and if ABA could stop the running digestion process once it had been activated.
In the present work it could be shown that the application of ABA on intact traps prior to
mechanically stimulating the trigger hairs (mechanostimulation) already significantly reduced
the transcription of digestive enzymes for an incubation time as short as 4 h, showing that
already short-term exposure to ABA counteracts the effects of jasmonates when it comes to
initiating the digestion process, but does not inhibit trap closure. Incubation for 24 and 48
hours with 100 μM active ABA had no effect on trap reopening, only very high levels of 200
μM of active ABA inhibited trap reopening but also led to tissue necrosis. As the application
of ABA could reduce the transcription of digestive hydrolases, it is likely that Dionaea can stop
the digestion process, if corresponding external stimuli are received.
Another factor, which only emerged later, was the effect of the wounding-induced systemic
jasmonate burst. As efficient as ABA was in inhibiting marker hydrolase expression after
mechanostimulation in intact plants, the application of ABA on truncated traps was not able
to inhibit mechanostimulation-induced marker hydrolase expression. One reason might be
that the ABA-signal is perceived in the roots, and therefore truncated traps were not able to
react to it. Another reason might be that the wounding desensitized the tissue for the ABAsignal.
Further research is required at this point.
Inhibitors of the jasmonate pathway were also used to assess their effect on the regulation of
Dionaea´s hunting cycle. Coronatine-O-methyloxime proved to be a potent inhibitor of
mechanostimulation-induced expression of digestive enzymes, thus confirming the key
regulatory role of jasmonates for Dionaea´s prey consumption mechanism.
In a parallel project, the generation of in vitro cultures from sterilized seeds and single plant
parts proved successful, which may be important for stock-keeping of future transgenic lines.
Protoplasts were generated from leaf blade tissue and transiently transformed, expressing the
reporter protein YFP after 24 h of incubation. In the future this might be the starting point for
the generation of transgenic lines or the functional testing of DNA constructs.