(+)-Abscisic Acid Content of Spinach in Relation to Photoperiod and Water Stress

AUTOR(ES)

Zeevaart, Jan A. D.

RESUMO

Levels of (+)-abscisic acid present in the long-day plant spinach (Spinacia oleracea L., cv. Savoy Hybrid 612) grown under different photoperiodic regimes were measured in purified extracts by optical rotary dispersion. When plants were transferred from short to long days, the abscisic acid content increased 2- to 3-fold. This rise in the level of abscisic acid took place during the 1st long day. Abscisic acid levels of plants under short days as well as under long-day conditions were higher at the end of the 8-hour high intensity light period than at its beginning.

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