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Callus regeneration from cotyledon protoplasts ofChamaecyparis obtusa (Hinoki cypress)

Summary

Protoplasts were isolated from cotyledons of 1- to 1.5-mo.-old seedlings ofChamaecyparis obtusa using 1% driselase or 0.25% pectolyase Y-23 in combination with 1% cellulase RS in 0.6M mannitol solution. Cell division and colony formation were induced efficiently in liquid Murashige and Skoog’s (MS) medium containing 0.6M mannitol and 10 to 30 μM 2,4-dichlorophenoxyacetic acid or 1 μM of naphthaleneacegic acid at the cell density of 1 to 2×103 ml. Continued callus proliferations was observed by transferring tissue to fresh medium of the same composition as the induction medium without mannitol. Campbell and Durzan’s medium and ammonium nitrate-free MS medium were less effective than MS medium. High concentration of benzyladenine (1 or 10 μM) was inhibitory to cell division.

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Correspondence to Hamako Sasamoto.

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Sasamoto, H., Kondo, A., Hosoi, Y. et al. Callus regeneration from cotyledon protoplasts ofChamaecyparis obtusa (Hinoki cypress). In Vitro Cell Dev Biol – Plant 28, 132–136 (1992). https://doi.org/10.1007/BF02823061

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Key words

  • protoplast culture
  • callus regeneration
  • conifers