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1 November 2006 ORGANOGENESIS, SHOOT REGENERATION, AND FLOWERING RESPONSE OF VERNONIA CINEREA TO DIFFERENT AUXIN/CYTOKININ COMBINATIONS
PRITI MAHESHWARI, ANIL KUMAR
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Abstract

A viable protocol has been developed for direct and indirect shoot regeneration of Vernonia cinerea. To establish a stable and high-frequency plant regeneration system, leaf and stem explants were tested with different combinations of α-naphthalene acetic acid (NAA), indole-3-acetic acid (IAA), and benzylaminopurine (BA). Lateral buds on nodal explants grew into shoots within 2 wk of culture in Murashige and Skoog (MS) basal medium supplemented with 20.9 μM BA. Excision and culture of nodal segments from in vitro-raised shoots on fresh medium with the same concentration of BA facilitated development of more than 15 shoots per node. Similarly leaf, nodal, and internodal explants were cultured on MS basal medium supplemented with different concentrations of BA, NAA, and IAA either alone or in combinations for callus induction and organogenesis. Shoot buds and/or roots were regenerated on callus. Shoot buds formed multiple shoots within 4 wk after incubation in induction medium. Adventitious buds and shoots proliferated when callus was cut into pieces and subcultured on MS basal medium containing 20.9 μM BA and 5.3 μM NAA. This combination proved to be the best medium for enhanced adventitious shoot bud multiplication, generating a maximum of 50 shoots in 4 wk. This medium was also used successfully for shoot proliferation in liquid medium. Root formation was observed from callus induced in medium containing 8.05–13.4 μM NAA. Regenerated shoots exhibited flowering and root formation in MS basal medium without any growth regulators. Plantlets established in the field showed 85% survival and exhibited identical morphological characteristics as the donor plant.

PRITI MAHESHWARI and ANIL KUMAR "ORGANOGENESIS, SHOOT REGENERATION, AND FLOWERING RESPONSE OF VERNONIA CINEREA TO DIFFERENT AUXIN/CYTOKININ COMBINATIONS," In Vitro Cellular and Developmental Biology - Plant 42(6), 589-595, (1 November 2006). https://doi.org/10.1079/IVP2006825
Received: 17 January 2006; Accepted: 10 September 2006; Published: 1 November 2006
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KEYWORDS
Acclimatization
adventitious buds
Asteraceae
Callus induction
Shoot multiplication
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