Authors: Jozef Kováčik Jiří Grúz Martin Bačkor Miroslav Strnad Miroslav Repčák
Publish Date: 2008/10/30
Volume: 28, Issue: 1, Pages: 135-
Abstract
The influence of salicylic acid SA doses of 50 and 250 μM for a period of up to 7 days on selected physiological aspects and the phenolic metabolism of Matricaria chamomilla plants was studied SA exhibited both growthpromoting 50 μM and growthinhibiting 250 μM properties the latter being correlated with decrease of chlorophylls water content and soluble proteins In terms of phenolic metabolism it seems that the higher SA dose has a toxic effect based on the sharp increase in phenylalanine ammonialyase PAL activity 24 h after application which is followed by an increase in total soluble phenolics lignin accumulation and the majority of the 11 detected phenolic acids Guaiacolperoxidase activity was elevated throughout the experiment in 250 μM SAtreated plants In turn some responses can be explained by mechanisms associated with oxidative stress tolerance these mitigate acute SA stress which is indicated by an increase in malondialdehyde content However PAL activity decreased with prolonged exposure to SA indicating its inhibition Accumulation of coumarinrelated compounds umbelliferone and herniarin was not affected by SA treatments while Z and E2βdglucopyranosyloxy4methoxycinnamic acids increased in the 250 μM SAtreated rosettes Free SA content in the rosettes increased significantly only in the 250 μM SA treatment with levels tending to decrease towards the end of the experiment and the opposite trend was observed in the rootsThis work was supported by the Slovak Grant Agency VEGA 1/3260/06 the Czech Ministry of Education MSM 6198959216 and partially by the grant of P J Šafárik University rector for young scientists to JK grant VVGS 4/0708 The authors thank Mrs Anna Michalčová Bc Lucia Tomková and Bc František Štork for their excellent technical assistance Thanks also to Seesediting Ltd for proofreading the manuscript and to Prof Dianne Fahselt University of Western Ontario Canada for constructive comments
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