Martin-Luther-Universität Halle-Wittenberg

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Prof. Edgar Peiter

Telefon: +49 (0)345 55-22420

Institut für Agrar- und Ernährungswissenschaften
Betty-Heimann-Straße 3
06120 Halle (Saale)

Prof. Birgit Dräger

Telefon: +49 (0)345-55-25765

Institut für Pharmazie
Hoher Weg 8
06120 Halle (Saale)

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Teilprojekt 07

Polyamines and drought tolerance: Cross-talk of polyamine and calcium signalling in stress tolerance of barley

Edgar Peiter (MLU), Birgit Dräger (MLU)

Drought is a major limitation for crop yield, and drought-tolerant crop cultivars are a world-wide requirement. Polyamines were shown to improve tolerance and recovery from drought, and recent results place spermine at a prime position for this effect. The mechanism of action of spermine is unknown, but there is strong evidence pointing to spermine modulation of cation channels. This project aims at investigating spermine formation and action in the crop Hordeum vulgare, distinguishing spermine from the positional isomer thermospermine. The enzyme responsible for spermine biosynthesis, H. vulgare spermine synthase, will be characterized and its expression in response to drought will be analysed. To clarify mechanism(s) of spermine action, effects of genetic and pharmacological alteration of spermine levels on various drought and salt stress parameters will be determined in whole plant, cell culture and epidermal strip assays. The hypothesis that spermine is intricately linked to ion homeostasis and Ca2+ signalling will be tested by reporter proteins and ion analysis. A first approach to identify direct spermine targets is made by studying proteins to which spermine specifically binds.

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