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Direct shoot bud regeneration from shoot tip explants of Enicostema axillare: an important medicinal plant

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Abstract

An efficient protocol has been developed for in vitro propagation of Enicostema axillare using shoot tip explants. The shoot tip explants were cultured on MS medium supplemented with various combinations of (BAP, KIN) and (NAA/IAA & IBA) in different concentrations between 0.5 and 2.0 mg/l for multiple shoot bud induction. The highest percent of (98.51 %) was observed at 1.0 mg/l BAP in combination with 0.2 mg/l KIN while maximum number of shoot buds (8.41 shoots/explant) was noticed on MS medium containing 1.0 mg/l BAP and 0.2 mg/l KIN combination. The highest frequency (90.82 %) of multiple shoot bud regeneration was observed at 1.0 mg/l BAP and 0.5 mg/l IBA with 15.12 ± 2.12 shoots/explants. The regenerated multiple shoots were transferred to half-strength MS medium augmented with different concentration of 0.5–2.5 mg/l IBA for rooting. Among the different concentrations of IBA tested, maximum percentage of rooting (100 %) was observed in MS medium augmented with 1.5 mg/l IBA. The rooted plantlets were successfully transferred into plastic cups containing soil and sand in the ratio of 1:1. Subsequently established in the field conditions with 90 % of survival rate. The protocol developed can be utilized for both large scale plant production and conservation of germplasm of this species. The described method can be successfully employed for large-scale multiplication and in vitro conservation as well as production of secondary metabolites of E. axillare.

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Fig. 1

Abbreviations

BAP:

6-Benzyl aminopurine

NAA:

α-Naphthalene acetic acid

IAA:

Indole acetic acid

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Sasidharan, P., Jayachitra, A. Direct shoot bud regeneration from shoot tip explants of Enicostema axillare: an important medicinal plant. Agroforest Syst 91, 471–477 (2017). https://doi.org/10.1007/s10457-016-9943-x

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