The Experts below are selected from a list of 40032 Experts worldwide ranked by ideXlab platform
Axel Mithofer - One of the best experts on this subject based on the ideXlab platform.
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additional evidence against jasmonate induced jasmonate Induction Hypothesis
Plant Science, 2015Co-Authors: Sandra S Scholz, Michael Reichelt, Wilhelm Boland, Axel MithoferAbstract:Jasmonates are phytohormones involved in development and stress reactions. The most prominent jasmonate is jasmonic acid, however, the bioactive jasmonate is (+)-7-iso-jasmonoyl-L-isoleucine (JA-Ile). Biosynthesis of jasmonates is long time known; compartmentalization, enzymes and corresponding genes are well studied. Because all genes encoding these biosynthetic enzymes are jasmonate inducible, a Hypothesis of jasmonate-induced-jasmonate-biosynthesis is widely accepted. Here, this Hypothesis was revisited by employing the synthetic JA-Ile mimic coronalon to intact and wounded leaves, which excludes structural cross-contamination with endogenous jasmonates. At an effective concentration that induced various jasmonate-responsive genes in Arabidopsis, neither accumulation of endogenous jasmonic acid, JA-Ile, nor of their hydroxylated metabolites was detected. Results indicate that in spite of jasmonate-induced biosynthetic gene expression, no jasmonate biosynthesis/accumulation takes place supporting a post-translational regulation.
Sandra S Scholz - One of the best experts on this subject based on the ideXlab platform.
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additional evidence against jasmonate induced jasmonate Induction Hypothesis
Plant Science, 2015Co-Authors: Sandra S Scholz, Michael Reichelt, Wilhelm Boland, Axel MithoferAbstract:Jasmonates are phytohormones involved in development and stress reactions. The most prominent jasmonate is jasmonic acid, however, the bioactive jasmonate is (+)-7-iso-jasmonoyl-L-isoleucine (JA-Ile). Biosynthesis of jasmonates is long time known; compartmentalization, enzymes and corresponding genes are well studied. Because all genes encoding these biosynthetic enzymes are jasmonate inducible, a Hypothesis of jasmonate-induced-jasmonate-biosynthesis is widely accepted. Here, this Hypothesis was revisited by employing the synthetic JA-Ile mimic coronalon to intact and wounded leaves, which excludes structural cross-contamination with endogenous jasmonates. At an effective concentration that induced various jasmonate-responsive genes in Arabidopsis, neither accumulation of endogenous jasmonic acid, JA-Ile, nor of their hydroxylated metabolites was detected. Results indicate that in spite of jasmonate-induced biosynthetic gene expression, no jasmonate biosynthesis/accumulation takes place supporting a post-translational regulation.
Bruno H. Repp - One of the best experts on this subject based on the ideXlab platform.
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perceptual restoration of a missing speech sound auditory Induction or illusion
Attention Perception & Psychophysics, 1992Co-Authors: Bruno H. ReppAbstract:This study investigated whether the apparent completeness of the acoustic speech signal during phonemic restoration derives from a process of auditory Induction (Warren, 1984) or segregation, or whether it is an auditory illusion that accompanies the completion of an abstract phonological representation. Specifically, five experiments tested the prediction of the auditory Induction (segregation) Hypothesis that active perceptual restoration of an [s] noise that has been replaced with an extraneous noise would use up a portion of that noise's high-frequency energy and consequently change the perceived pitch (timbre, brightness) of the extraneous noise. Listeners were required to compare the pitch of a target noise, which replaced a fricative noise in a sentence, with that of a probe noise preceding or following the speech. In the first two experiments, a significant tendency was found in favor of the auditory Induction Hypothesis, although the effect was small and may have been caused by variations in acoustic context. In the following three experiments, a larger variety of stimuli were used and context was controlled more carefully; this yielded negative results. Phoneme identification responses collected in the same experiments, as well as informal observations about the quality of the restored phoneme, suggested that restoration of a fricative phone distinct from the extraneous noise did not occur; rather, the spectrum of the extraneous noise itself influenced phoneme identification. These results suggest that the apparent auditory restoration which accompanies phonemic restoration is illusory, and that the schema-guided process of phoneme restoration does not interact with auditory processing.
Wilhelm Boland - One of the best experts on this subject based on the ideXlab platform.
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additional evidence against jasmonate induced jasmonate Induction Hypothesis
Plant Science, 2015Co-Authors: Sandra S Scholz, Michael Reichelt, Wilhelm Boland, Axel MithoferAbstract:Jasmonates are phytohormones involved in development and stress reactions. The most prominent jasmonate is jasmonic acid, however, the bioactive jasmonate is (+)-7-iso-jasmonoyl-L-isoleucine (JA-Ile). Biosynthesis of jasmonates is long time known; compartmentalization, enzymes and corresponding genes are well studied. Because all genes encoding these biosynthetic enzymes are jasmonate inducible, a Hypothesis of jasmonate-induced-jasmonate-biosynthesis is widely accepted. Here, this Hypothesis was revisited by employing the synthetic JA-Ile mimic coronalon to intact and wounded leaves, which excludes structural cross-contamination with endogenous jasmonates. At an effective concentration that induced various jasmonate-responsive genes in Arabidopsis, neither accumulation of endogenous jasmonic acid, JA-Ile, nor of their hydroxylated metabolites was detected. Results indicate that in spite of jasmonate-induced biosynthetic gene expression, no jasmonate biosynthesis/accumulation takes place supporting a post-translational regulation.
Michael Reichelt - One of the best experts on this subject based on the ideXlab platform.
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additional evidence against jasmonate induced jasmonate Induction Hypothesis
Plant Science, 2015Co-Authors: Sandra S Scholz, Michael Reichelt, Wilhelm Boland, Axel MithoferAbstract:Jasmonates are phytohormones involved in development and stress reactions. The most prominent jasmonate is jasmonic acid, however, the bioactive jasmonate is (+)-7-iso-jasmonoyl-L-isoleucine (JA-Ile). Biosynthesis of jasmonates is long time known; compartmentalization, enzymes and corresponding genes are well studied. Because all genes encoding these biosynthetic enzymes are jasmonate inducible, a Hypothesis of jasmonate-induced-jasmonate-biosynthesis is widely accepted. Here, this Hypothesis was revisited by employing the synthetic JA-Ile mimic coronalon to intact and wounded leaves, which excludes structural cross-contamination with endogenous jasmonates. At an effective concentration that induced various jasmonate-responsive genes in Arabidopsis, neither accumulation of endogenous jasmonic acid, JA-Ile, nor of their hydroxylated metabolites was detected. Results indicate that in spite of jasmonate-induced biosynthetic gene expression, no jasmonate biosynthesis/accumulation takes place supporting a post-translational regulation.