Callus Induction and Regeneration from Germinating Mature Embryos of Wheat (Triticum aestivum L.)

A high-performance protocol for callus induction was devised using germinating mature embryos of two local wheat (Triticum aestivum L.) landraces as explant. The results showed that callus development from germinating embryos was rapid starting one day after culture with an induction rate 20 to 25% higher than those of soaked embryos. In addition, the mean rate of growth of callus developed from germinating embryos was 60 to 70% higher than those cultured from soaked embryos. This study also demonstrated a higher frequency of green spots formation(48 to 56%)on callus derived from germinating embryos compared to their soaked counterpart (24 to 28%), suggesting a better differentiation potential of callus cultures derived from germinating embryo. These findings indicate that germinating mature embryo is more suitable explant for wheat callus induction and regeneration than the soaked mature embryo commonly employed for wheat callus culture.

Effect of ZnO, TiO2, Al2O3 and ZrO2 nanoparticles on wheat callus cells

Effect of metal oxide nanoparticles on calli of two wheat varieties: Parabola (stress tolerant) and Raweta (sensitive) was studied. ZnO induced 10% larger membrane damage in Raweta calli. TiO2, Al2O3, and ZrO2 caused nearly 30% greater lactate dehydrogenase leakage for Raweta compared to Parabola. UV-irradiation of samples containing ZnO particles intensified this effect. Membrane lipid peroxidation in ZnO treated Raweta calli was twice as high as in Parabola and further increased after UV-irradiation. TiO2, Al2O3, and ZrO2 nanoparticles caused a 4-fold increase in malondialdehyde concentration in Raweta calli in comparison to Parabola calli. The nanoparticles studied damaged the cellular defense system by inactivating the antioxidative enzymes.

Callus induction from shoot apical meristem in Triticum spelta L. and T. aestivum L.

Aim. To develop an effective protocol for callus induction from shoot apical meristem in Triticum spelta L. and T. aestivum L. Methods. Plant material: spelt “Europe” and common wheat “Bunchuk”. For this research we used shoot apical meristems from 3-days plants. For callus induction we proposed 4 media with different concentration of 2,4-D, picloram, NAA and AgNO3. Explants were growing in dark during 21 day at + 25 C. Results. Calli were transparent and mild, less than 8 mm. For callus induction positive effect were shown on media with 2,4-D and picloram. At the same time, NAA was not such effective. Conclusions. In our research was shown, that the best media for spelt callus induction should have 2 mg/l 2,4-D and 10 mg/l AgNO3. Keywords: callusogenesis, spelt (Triticum spelta L.), common wheat, callus, shoot apical meristem.