EFFECT OF STARTING DATE AND TEMPERATURE OF STORAGE ON CHANGES IN FREE AMINO ACIDS IN ANTHERS FROM BULBS OF TULIP CV. APELDOORN, AS RELATED TO THE SPECIAL PRECOOLING

The contents of the free amino acids arginine, asparagine, aspartic acid, glycine, histidine, lysine and tryptophan were determined weekly in freeze-dried anthers from bulbs of tulip cv.
Apeldoorn during 12 weeks of storage at 5°C (cold treatment) or 17°C (control). The cold treatment started either on 21 September or 5 October 1987, and the contents and patterns of change during treatments were compared mutually and with the criterion for special precooling.
The contents and patterns of changes were different for the bulbs stored at 5 and 17°C, as in previous work.
However the patterns of change differed for asparagine and glycine with the date of starting treatment.
The contents of arginine, asparagine, histidine, lysine and tryptophan (<108–110, <6, <3–4, <4–5, <1–3 mmo1/kg, respectively) met the criterion as proposed and could indicate a certain duration of cold.
Glycine failed to meet the criterion.

Aspartic acid is the only amino acid which both could indicate cooling and duration of cold treatment.

V International Symposium on Flower Bulbs

N. Gorin, J. Tonecki, J.M. Franssen

https://doi.org/10.17660/ActaHortic.1990.266.19