The influence of light quality on levels of abscisic acid in tomato plants and evidence for a novel abscisic acid metabolite

Loveys, B.R.

Physiologia Plantarum 46(2): 79-84

1979


ISSN/ISBN: 0031-9317
DOI: 10.1111/j.1399-3054.1979.tb06535.x
Accession: 006698367

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Abstract
Tomato [Lycopersicon esculentum cv. Grosse Lisse] plants were grown in growth cabinets under 2 different light sources. One source consisted of white and red fluorescent tubes (Red cabinet), while the 2nd consisted of tungsten filament and fluorescent lamps (Far-red cabinet). Energy fluence rates were adjusted to give equal photosynthetic rates in the 2 cabinets. Extension growth was approximately 3 .times. greater in the Far-red cabinet. No difference could be detected in abscisic acid (ABA) levels in leaves of petioles of plants grown under the 2 light regimes, but levels were 40-90% greater in stems of the slower growing plants illuminated with fluorescent light only. Exogenously applied ABA effectively reduced the growth rate of the plants in the Far-red cabinet to that of plants in the Red cabinet. However, it was shown that light-induced changes in growth rates occurred before any change in endogenous ABA could be demonstrated, thus precluding a role for ABA in the initial response to a change in light quality. The changed ABA levels appeared to be the result of a modified pathway of ABA degradation. Evidence is presented for a novel metabolite of ABA which yields free ABA on basic hydrolysis.

The influence of light quality on levels of abscisic acid in tomato plants and evidence for a novel abscisic acid metabolite