Fe-EDDHA Promotes Rooting of Rootstock GF-677 (Prunus amygdalus × P. persica) Explants in vitro

The effect of organic (Fe-EDTA and Fe-EDDHA) and inorganic (FeCl3) iron substances on rooting of the rootstock GF-677 (Prunus amygdalus × Prunus persica) in vitro was studied. Full rooting (100 %) was observed in explants nourished with Fe-EDDHA, while less rooting was found in the absence of iron or in the presence of FeCl3. On the contrary, no root formation was observed in explants nourished with Fe-EDTA, which showed extremely lower chlorophyll and high iron contents at the end of the experiment.