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21 August 2007 In vitro regeneration through somatic embryogenesis and organogenesis using cotyledons of Cassia angustifolia Vahl
Veena Agrawal, Pratima Rani Sardar
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Abstract

In vitro regeneration through somatic embryogenesis as well as organogenesis using cotyledon of a woody medicinal legume, Cassia angustifolia is reported. The cotyledons dissected from semi-mature seeds, if inoculated on Murashige and Skoog's medium (MS) supplemented with auxin alone or in combination with cytokinin, produced direct and indirect somatic embryos. A maximum of 14.36±2.26 somatic embryos per 20 mg of explants including callus were produced in 70% cultures on MS medium with 2.5 μM benzyladenine (BA) 10 μM 2,4-dichlorophenoxyacetic acid (2,4-D). Although the percentage of embryogenic cultures was higher (83.33%) at 10 μM 2,4-D 1 μM BA, the average number of somatic embryos was much less (7.6±0.85) at this level, whereas at 2.5 μM BA and 5 μM 2,4-D, there was a simultaneous formation of both somatic embryos and shoots. The somatic embryos, although started germinating on the same medium, developed into full plantlets only if transferred to MS basal with 2% sucrose. Cytokinins alone did not induce somatic embryogenesis, but formed multiple shoots. Five micromolar BA proved optimum for recurrently inducing shoots in the competent callus with a maximum average of 12.04±2.10 shoots and shoot length of 2.26±0.03 cm. Nearly 91.6% shoots (2–2.5 cm in size) organized an average of 5.12±0.58 roots on half strength MS 10 μM indole-3-butyric acid. All the plantlets have been transferred successfully to soil. Types of auxin and its interaction with cytokinin significantly influenced somatic embryogenesis.

Veena Agrawal and Pratima Rani Sardar "In vitro regeneration through somatic embryogenesis and organogenesis using cotyledons of Cassia angustifolia Vahl," In Vitro Cellular and Developmental Biology - Plant 43(6), 585-592, (21 August 2007). https://doi.org/10.1007/s11627-007-9058-1
Received: 13 October 2006; Accepted: 20 June 2007; Published: 21 August 2007
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KEYWORDS
Benzyladenine
Indole-3-butyric acid
plantlet
rooting
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