Abstract
Experiments have been performed to induce callus formation and organogenesis in anther culture of cassava (Manihot esculenta Crantz). Callusing was achieved on a modified Murashige and Skoog medium (MSB) supplemented with 4.44 μM 6-benzylaminopurine (BAP) and 4.52 μM 2,4-dichlorophenoxyacetic acid (2.4-D). No callus was formed from anthers pretreated at 4 °C for more than 48 h or on a medium containing 4g/ℓ activated charcoal. Callus on MSB with 4.44–8.88 μM BAP alone formed roots only. BAP (8.88 μM) in combination with α-naphthalene acetic acid (NAA) (10.74 μM) resulted in chlorophyll formation in callus. Abscisic acid (ABA) acted as an antagonist to NAA in reducing the frequency of callus greening when the latter was applied jointly with BAP. Chromosome counts of mitotic figures from callus cells ranged from 34 to 38 indicating that the calli were derived from the somatic tissues of the anthers.
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