Abstract
Caulogenic responses of various explant types from 12-month-old plants of Hemidesmus indicus were tested. Second and third visible nodes (0.5 cm) from the apex and root segments (0.5 cm) were the most and least regenerative respectively, with the formation of 9.37 and 2.6 shoots in 4 weeks on half strength MS medium supplemented with 2.22 μM BA and 1.07 μM NAA and 4.44 μM BA and 2.69 μM NAA respectively. Caulogenic ability of the nodes decreased with increasing maturity. Shoot buds initiated upon the young nodes on day 10 developed into 7.2 cm long shoots within 4 weeks thereby making a shoot elongation phase unnecessary. Nodal explants of the in vitro raised shoots subcultured in the same medium produced 9.32 shoots of 7.1 cm length in 3–4 weeks, similar to those of the mature plant-derived nodes. Multiplication through subculture of the nodes up to 25 passages of 4 weeks each was achieved without decline. Shoot cultures were rooted in quarter salt strength MS medium containing 9.8 μM IBA and the rooted plants were hardened for establishment in pots at 96% rate. Four months after establishment, the micropropagated plants were stable and showed uniform morphological and growth characteristic. After 12 months of cultivation in the field, on an average micropropagated plant consisted of 4–5 shoots, 5–8 branches per shoot and increased root biomass (13.5 g) compared to the poor growth (single shoot and 2–3 branches) and root production (4.6 g) values obtained with plants raised from conventional rooted stem cuttings. The concentration of the root specific compound, 2-hydroxy 4-methoxy benzaldehyde per plant was 2–3 fold higher in micropropagated plants though on unit dry root biomass (0.12% per g dry wt) basis it remained the same between two sources of plants.
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Sreekumar, S., Seeni, S. & Pushpangadan, P. Micropropagation of Hemidesmus indicus for cultivation and production of 2-hydroxy 4-methoxy benzaldehyde. Plant Cell, Tissue and Organ Culture 62, 211–218 (2000). https://doi.org/10.1023/A:1006486817203
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DOI: https://doi.org/10.1023/A:1006486817203