Abstract
We investigated the effect of exogenous cytokinins and marine bioactive substances containing seaweed extracts (marketed by the ROULLIER Group under the trade name N PROTM.) on nitrate reductase activity in Arabidopsis. Cytokinins, applied either directly in the growth medium or as a foliar spray, did not significantly influence nitrate reductase activity in extracts from in vitro grown Arabidopsis plants. Conversely, Arabidopsis grown in the presence of or sprayed with N PRO had increased nitrate reductase activity. This stimulatory effect of N PRO was even higher when the plants were grown on low nitrate concentration, suggesting that these marine bioactive substances may be beneficial for plant growth in adverse nutritional conditions.
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