A device for comparing callus growth rates in vitro.
A device to compare the kinetics of callus growth in vitro is described. Changes in volumes of callus grown in scintillation vials were monitored photometrically without removing the sample from the solid support and medium. It is shown that a fiberglass-paper solid support is superior to a plastic foam solid support for the growth of American chestnut callus.
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Plant Hormone and Regulators Laboratory, Plant Physiology Institute, Agricultural Research Service, United States Department of Agriculture, Beltsville, Maryland 20705.