The influence of culture medium and explant on callus and shoot formation of lentil (Lens culinaris Medik.) has been studied. Three different explants (shoot-tip, first node and first pair of leaves) from three Spanish lentil cultivars were cultivated on two basal media: Murashige and Skoog medium (MS) and medium with mineral salts of MS medium plus vitamins of Gamborg's B5 medium (MSB), supplemented with growth regulators. Media with 2,4-D induced the formation of calli in all explants, but no organ regeneration was obtained from these caUi. Multiple shoot formation was obtained from 33% to 92% of the explants in media supplemented with 2.25 mg 1-~ of BA and 0.186 mg I J NAA + 2.25 mg 1-l BA; in the other media one to two shoots per explant were formed in 10 to 98% of the explants. Root formation from explants was achieved only in media with NAA or IAA. Of the explants tested, the best morphogenetic responses were obtained from nodes and the poorest from leaves.
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