Abstract
This study describes direct organogenesis from soybean hypocotyl segments with distinctions of adventitious shoot differentiation without callus phase along with high frequency of plantlet development (64.04%) within a period of 14 wk. This was mainly attributed to manipulation of the culture medium with potent plant growth regulators. A large number of segments (77.36 ± 1.01%) cultured on medium fortified with 1.0 mg L−1 TDZ displayed appearance of adventitious buds on acropetal ends in 15 d with 2.67 ± 0.58 buds per segment. The shoot bud-bearing segments (64.10 ± 4.44%) exhibited 3.67 ± 0.58 shoots per segment on medium containing 2.0 mg L−1 AgNO3 within 15 d of culturing. The transfer of multiple shoots on elongation medium resulted in shoot elongation within 15 d. A sizeable number of elongated shoots (87.02 ± 3.01%) showed adventitious root induction with 3.33 ± 1.15 roots per shoot on medium supplemented with 3.0 mg L−1 IBA in 6 wk. The plantlets were hardened successfully with a survival rate of 94.89% in soil and demonstrated normal growth. The histological analysis revealed that leafy shoot-like structures originated from the cortical region of hypocotyl segments confirming a phenomenon of direct shoot regeneration.
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The authors thank the School of Agricultural Biotechnology, Punjab Agricultural University, Ludhiana, for providing infrastructural support to carry out this research.
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EP conducted in vitro experiments. AKalia carried out histological analysis. BSG provided the seed material and maintained plants in the glasshouse. AKaur supervised in vitro experiments and analyzed the direct organogenesis data. JSS planned, coordinated the experiments, interpreted results, and drafted the manuscript. All authors have read and approved the final manuscript.
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Patel, E., Kalia, A., Gill, B.S. et al. Direct organogenesis from cortical cells of hypocotyl segments in soybean. In Vitro Cell.Dev.Biol.-Plant 59, 140–146 (2023). https://doi.org/10.1007/s11627-023-10329-5
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DOI: https://doi.org/10.1007/s11627-023-10329-5