Early stages of somatic embryogenesis in root callus of grasspea (Lathyrus sativus L.) Wczesne etapy somatycznej embriogenezy w kalusie korzeniowym lędźwianu siewnego (Lathyrus sativus L.)

Callus cultures from root explants of Lathyrus sativus L. ‘Derek’ were tested for their morphogenic capacity. Primary explants (fragments of roots) were cultivated on three induction media. We obtained three lines of callus tissue among which we identified two non-embryogenic lines and one embryogenic line. Callus originally cultivated on modified MS medium supplemented with 0.05 mgL picloram, formed embryo-like structures upon transfer to media containing 0.1 mgL picloram or 0.9 mgL2,4-D. Histological examinations confirmed embryogenity of obtained structures. Previous studies had revealed that, notwithstanding efficient callus induction and proliferation, its capacity to differentiate shoots or somatic embryos is limited. Consequently, rhizogenesis was only form of complete organogenesis obtained in our experiments. However attempts to develop the methods for indirect plant regeneration in L. sativus would allow creation of new genetic variations required to improvement of this species.