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Does polyamine catabolism influence root development and xylem differentiation under stress conditions?
Alessandra Tisi1, Riccardo Angelini, Alessandra Cona
1Dipartimento di Biologia, Università Roma Tre Viale G. Marconi, Rome, Italy.
Plant Signaling & Behavior
|November 8, 2011
Summary
Hydrogen peroxide (H2O2) from polyamine (PA) breakdown by amine oxidases (AOs) may induce root xylem differentiation during plant stress. PA levels and AO expression influence plant development and stress responses by altering the PA/H2O2 balance.
Area of Science:
- Plant Biology
- Biochemistry
- Molecular Biology
Background:
- Amine oxidases (AOs) are enzymes that catalyze the oxidation of polyamines (PAs), producing aldehydes and hydrogen peroxide (H2O2).
- AOs, including copper-containing AOs (CuAOs) and flavin-containing PAOs, are involved in PA homeostasis and are induced by stress.
- H2O2 produced by PA catabolism is implicated in various plant processes.
Purpose of the Study:
- To investigate the role of H2O2 derived from PAO-mediated PA catabolism in root xylem differentiation during plant stress responses.
- To explore the contrasting effects of spermidine (Spd) on cell death in wild-type (WT) and S-ZmPAO over-expressing tobacco plants.
- To propose a model where PA effects on plant development and stress responses are modulated by AO expression levels.
Main Methods:
- Enzyme activity assays to measure AO activity.
- H2O2 detection methods.
- Plant treatments with spermidine (Spd).
- Phenotypic analysis of wild-type and transgenic tobacco plants (Nicotiana tabacum) over-expressing maize PAO (S-ZmPAO).
Main Results:
- H2O2 from PAO-mediated PA catabolism is suggested to induce root xylem differentiation during plant stress, but not under physiological conditions.
- Spermidine supply induced greater cell death in WT tobacco compared to S-ZmPAO over-expressing plants, contradicting previous findings in untreated plants.
- This suggests that the level of AO expression significantly impacts how PAs affect plant responses.
Conclusions:
- PAO-derived H2O2 plays a role in root xylem differentiation during plant stress.
- The impact of PAs on plant development and stress tolerance is dependent on the expression levels of AOs.
- Altering the balance of PAs and H2O2 through AO expression can lead to differential plant responses under varying conditions.
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