β-N-Oxalyl-L-α, β-diaminopropionic Acid in Somaclones Derived from Internode Explants of Lathyrus sativus

Abstract

Protocols have been developed for in vitro regeneration from internode explants from Lathyrus sativus. Callus raised on B₅ medium supplemented with 10.7 μM NAA + 2.2 μM BA permitted shoot regeneration upon transfer to modified MS medium containing 10.7 μM NAA + 2.2 μM BA. Rooting was obtained only on 1/2 MS media containing 0.5 μM IBA. The in vitro regenerated plants, after primary and secondary hardening, were taken to the field. Analysis of ODAP in leaves and seeds was carried out. The low toxin containing progeny of the somaclones were further grown in the field. The toxin contents varied from 0.015% to 0.460% in leaf and 0.030% to 0.539% in seed in R, generation, as compared to 0.258% in leaf and 0.406% in seed for the parent P-24. Statistical analysis showed a positive significant correlation between leaf and seed ODAP contents. Mean seed toxin in R₁ generation of some of the somaclones varied from 0.039–0.057% and single plant seed yield varied from 25.8 to 45.0 g. Some plants showed seed toxin content of less than 0.01% from 1–22 progeny. Thus, following in vitro culture of internode explant, toxin content in seeds in R₂ generation has been found to be substantially reduced with single plant seed yield either equal to or higher than that of parent cv. P 24.