Vorlesung 8: Makro und Mikronährstoffe

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Vorlesung 8: Makro und Mikronährstoffe

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Makro und Mikronährstoffe

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Vorlesung 8

Kalium ist essentieller Nährstoff in Pflanzen

Aufnahme: Zweiphasige Transport- hängt von Konzentration von Kalium an

(Hochaffine Transport- niedrige Konzentration- mehr Energie)

K+-Mobilisierung zur effizienten K+-Nutzung

(schwarz- hohe K-Konzentration) erst in Vakuolen wird aufgebraucht, dann in Cytosol

K+ kann in Gewebe mit hoher Priorität (z.B. wachsend, photosynthetisch aktiv) verschoben werden

, Schwefel- essentieller Makronährstoff in Aminosäuren & anderen Verbindungen

In Aminosäuren, Oxidation/Reduktion, Metalltransport& Detoxifizierung

Thiolgruppe ist Redoxaktiv, Bindung von Schwermetallionen

Geschmack/Geruch (z.B. Knoblauch – Allicin, schwarze Johannisbeere)

Verteidigung: Camalexin und Glucosinolate (Abwehr)

Schwefelmangel durch Abluftreinigung:

Verbrennung fossiler Energieträger  Schwefeldioxid Saurer Regen Pflanzenschäden

Schwefelmangel in einigen Nutzpflanzen, v.a. Raps und Weizen

Schwefel kann in verschiedenen anorganischen Formen vorliegen

Pflanzen nehmen Schwefel aus Boden als Sulfat und in geringerem Umfang von
Atmosphäre als SO2 oder H2S auf

Sulfataufnahme durch SULTR-Transporter

Primärassimilation in Wurzel v.a. durch SULTR1;1 und
SULTR1;2

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Study: molekulare Biologie
Uploaded on: November 5, 2021
Number of pages: 11
Written in: 2021/2022
Type: Class notes
Professor(s): Stephan hobe
Contains: All classes

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