Abuelsoud W., Papenbrock J., Drought differentially elicits antioxidant defense systems in two genotypes of Euphorbia tirucalli, Flora, 2019, 259:151460, doi: 10.1016/j.flora.2019.151460
The authors compare leaves and stems of Morocco and Senegal genotypes of Euphorbia tirucalli after eight weeks at 25% or 10% volumetric water content in the substrate. They measure H₂O₂, MDA, proline, phenolic compounds, glutathione, extract antioxidant capacity and activities of protective enzymes. Stems show responses involving different enzymes in the two genotypes, while leaves follow a different pattern. Interpretation of some results depends on normalization to dry mass or tissue water, and an involvement of H₂O₂ in leaf shedding remains hypothetical.