What question did this study set out to answer?

To investigate the regulation and physiological role of nitrilase 3 (NIT3) in Arabidopsis thaliana under nutrient stress, specifically sulphur deprivation.

April 1, 2002The Plant JournalOpen Access

A role for nitrilase 3 in the regulation of root morphology in sulphur‐starving Arabidopsis thaliana

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Authors

AKAlexandra KutzMax Planck Society AMAxel MüllerCalifornia Institute of Technology PHPeter HennigGoethe University Frankfurt

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Implication

Plant experiment uncovers nitrilase 3 upregulation during sulphate deficiency in Arabidopsis, suggesting auxin-driven root adaptation.

Key Points

To investigate the regulation and physiological role of nitrilase 3 (NIT3) in Arabidopsis thaliana under nutrient stress, specifically sulphur deprivation.
Generated transgenic Arabidopsis thaliana expressing the beta-glucuronidase reporter gene (uidA) driven by the NIT3 promoter (NIT3p::uidA) to evaluate tissue-specific promoter activity.
Performed promoter deletion analysis (mapping regions upstream of the transcriptional start site) and exposed plants to nutrient-depleted media (sulphur, nitrogen, or phosphorus deficiency) and O-acetylserine treatment.
Measured nitrilase protein levels, enzymatic activity, glucosinolate profiles (specifically glucobrassicin), and root architecture changes under sulphur starvation.
Sulphur deprivation specifically induced NIT3 promoter activity, polypeptide levels, and nitrilase activity, localizing to root conductive tissues and lateral root primordia, with the responsive element mapped to a 317 bp promoter segment (nt -2151 to -1834).
O-acetylserine strongly stimulated NIT3 promoter activity, while nitrogen and phosphorus deprivation yielded no detectable changes.
Sulphur starvation triggered preferential depletion of glucobrassicin and led to extended root length and increased lateral root branching at the expense of shoot growth.

Cite This Study

Kutz et al. (2002) studied this question.

synapsesocial.com/papers/6a705e3c26770c2b8de07d29 https://doi.org/10.1046/j.1365-313x.2002.01271.x

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A role for nitrilase 3 in the regulation of root morphology in sulphur‐starving Arabidopsis thaliana

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Cite This Study

A role for nitrilase 3 in the regulation of root morphology in sulphur‐starving Arabidopsis thaliana

Discussion

Member takes

Implication

Key Points

Cite This Study

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