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Adventitious organogenetic structures were produced in vitro using cotyledon explants excised from 14 day-old pepper seedlings. The best response was observed on MS medium containing 5.7 μM indole-3-acetic acid and 8.8 μM 6-benzylaminopurine. However, when transferred onto elongation medium (MS + 2.8 μM gibberellic acid), these structures frequently developed into leaf-like features rather than into normal shoots. Interestingly, the histological study conducted on the cut end of the cotyledonary petiole revealed a direct induction of numerous teratological protuberances that arise around the cut end of the explant. On the contrary, typical organized bud meristems were rarely observed. Thus, the low number of plants obtained after transfer onto elongation medium seems to be a consequence of this teratological developmental process, frequently associated with fasciated and degenerative meristems, rather than a defect in shoot development from available meristems.

Morpho-histological study on shoot bud regeneration in cotyledon cultures of pepper (Capsicum annuum)