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Effects of medium components and light on callus induction, growth, and frond regeneration in Lemna gibba (Duckweed)

  • H. K. Moon
  • A. M. Stomp
Developmental Biology/Morphogenesis

Summary

Basal media, plant growth regulator type and concentration, sucrose, and light were examined for their effects on duckweed (Lemna gibba) frond proliferation, callus induction and growth, and frond regeneration. Murashige and Skoog medium proved best for callus induction and growth, while Schenk and Hildebrandt medium proved best for frond proliferation. The ability of auxin to induce callus was associated with the relative strength of the four auxins tested, with 20 or 50 µM 2,4-dichlorophenoxyacetic acid giving the highest frequency (10%) of fronds producing callus. Auxin combinations did not improve callus induction frequency. Auxin in combination with other plant growth regulators was needed for long-term callus growth; the two superior plant growth regulator combinations were 10 µM naphthaleneacetic acid, 10 µM gibberellic acid, and 2 µM benzyladenine with either 1 or 20 µM 2,4-dichlorophenoxyacetic acid. Three percent sucrose was best for callus induction and growth. Callus induction and growth required light. Callus that proliferated from each frond’s meristematic zone contained a mixture of dedifferentiated and somewhat organized cell masses. Continual callus selection was required to produce mostly dedifferentiated, slow-growing callus cell lines. Frond regeneration occurred on Schenk and Hildebrandt medium without plant growth regulators but was promoted by 1 µM benzyladenine. Callus maintained its ability to regenerate fronds for at least 10 mo. Regenerated fronds showed a slower growth rate than normal fronds and a low percentage of abnormal morphologies that reverted to normal after one or two subcultures.

Key words

tissue culture plant growth regulators media light sucrose 

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Copyright information

© Society for In Vitro Biology 1997

Authors and Affiliations

  • H. K. Moon
    • 1
  • A. M. Stomp
    • 2
  1. 1.Institute of Forest GeneticsSuwon KyonggidoRepublic of Korea
  2. 2.Forestry DepartmentNorth Carolina State UniversityRaleigh

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