title: A gibberellin bioassay based on betacyanin production in Amaranthus caudatus seedlings.
abstract: Amaranthus caudatus L. seedlings produce less amaranthin in the presence of gibberellic acid A3 (GA3). This phenomenon has been tested as a bioassay for gibberellic acid and has been compared to the bioassay based on lettuce hypocotyl extension. The inhibition of pigment synthesis is much more sensitive to GA3 at concentrations from 1 to 0.01 μg/ml. Of the gibberellins tested GA1, GA3, GA4, and GA7 are the most active in the described bioassay.
authors.affiliation: Plant Cell Metabolism Laboratory, Department of Botany, The University, BS8 1UG, Bristol, UK.
authors.forename: L T
authors.initials: LT
authors.lastname: Kinsman
authors.forename: N J
authors.initials: NJ
authors.lastname: Pinfield
authors.forename: A K
authors.initials: AK
authors.lastname: Stobart