ORIGINAL RESEARCH
The Effect of Auxins and Salicylic Acid on Chlorophyll and Carotenoid Contents in Wolffia Arrhiza (L.) Wimm. (Lemnaceae) Growing on Media of Various Trophicities
1. R. Czerpak, 1. P. Dobrzyń, 1. A. Krotke, 2. E. Kicińska
 
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1. Institute of Biology, University of Białystok,
Świerkowa 20B, 15-950 Białystok, Poland
2. Institute of Ecology, Polish Academy of Sciences,
Dziekan–w Leśny, 05-092 Łomianki, Poland
 
Pol. J. Environ. Stud. 2002;11(3):231–235
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ABSTRACT
In Wolffia arrhiza (Lemnaceae) growing on municipal tap water (rich in mineral but poor in organic components) and thus being exclusively photoautotrophic, IAA (3-indolilacetic acid) and SA (salicylic acid) strongly stimulated action on the content of chlorophylls a and b and carotenoids (especially b-carotene and lutein + zeaxanthin). On the other hand, the chemical analogues of IAA, i.e. PAA (phenylacetic acid) and NAA (a-naphtylacetic acid), had a generally inhibitory effect on chlorophyll and carotenoid contents. In Wolffia arrhiza growing on raw waste water and a suspension of activated sludge from a sewage treatment plant (rich in organic substances) characterized by mixotrophism (that is photo- and heterotrophism) PAA had the highest stimulative action on the chlorophyll a and b content, SA negligible, whereas NAA had an inhibitory effect. IAA had a slight stimulative effect on raw sewage but inhibitory on activated sludge. Also, the greatest stimulative effect on carotenoids content was exerted by PAA; SA had a slight stimulative effect while IAA and, to a greater extent NAA had a clearly inhibitory influence.
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ISSN:1230-1485