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Auxin activity of phenylacetic acid in tissue culture

Abstract

The ability of phenylacetic acid (PAA), a naturally occurring auxin, to initiate and support growth of callus and suspension cultures of several species is reported. Callus tissue of tobacco (Nicotiana tabacum L. var. WI-38), initiated and maintained on a medium with 2,4-dichlorophenoxyacetic acid (2,4-D), was transferred to and maintained on media supplemented with 25–500 μM PAA as the only plant growth regulator (PGR). Optimal concentrations of PAA were determined for tobacco callus proliferation in the dark (250 μM PAA) and with a 16-h light/8-h dark photoperiod (500 μM PAA). Tobacco suspension cultures were maintained for over 28 transfers in media containing 20–40 μM PAA as the sole PGR. When tobacco callus tissue maintained on PAA-supplemented media for over 18 months was transferred to liquid media containing kinetin, plantlets were regenerated. Callus of sunflower (Helianthus annuus L. var. Russian Mammoth) proliferated on media containing PAA at 5–250 μM as the sole PGR. Similar PAA concentrations inhibited normal development and promoted callus formation in tobacco and pea (Pisum sativum L. vars. common, Frogel, and Frimas) epicotyl tissue. PAA as the sole PGR did not support the growth of soybean (Glycine max (L.) Merrill var. Fiskeby) callus or suspension cultures. Chickpea (Cicer arietinum L. var. UC-5) and lentil (Lens culinaris Medic. var. Laird) callus cultures proliferated on media containing 25–500 μM PAA, but habituation of the cultures was common. PAA was not toxic to tobacco, chickpea, and lentil tissues at levels as high as 500 μM.

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Paper No. 88514 of the Journal Series of the Idaho Agricultural Experiment Station, Moscow, Idaho, USA.

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Leuba, V., LeTourneau, D. Auxin activity of phenylacetic acid in tissue culture. J Plant Growth Regul 9, 71 (1990). https://doi.org/10.1007/BF02041944

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  • DOI: https://doi.org/10.1007/BF02041944

Keywords

  • Plant Growth Regulator
  • Callus Induction
  • Callus Culture
  • Callus Tissue
  • Phenylacetic Acid