Salicylic acid-induced changes to growth and phenolic metabolism in <Emphasis Type="Italic">Matricaria chamomilla</Emphasis> plants |
| |
Authors: | Jozef Ková?ik Ji?í Grúz Martin Ba?kor Miroslav Strnad Miroslav Rep?ák |
| |
Institution: | (1) Department of Botany, Institute of Biology and Ecology, Faculty of Science, P. J. Šafárik University, Mánesova 23, 041 67 Košice, Slovak Republic;(2) Laboratory of Growth Regulators, Palacky University, Institute of Experimental Botany ASCR, Šlechtitelů 11, 783 71 Olomouc, Czech Republic |
| |
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 growth-promoting (50 μM) and growth-inhibiting (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 ammonia-lyase (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. Guaiacol-peroxidase activity was elevated throughout the experiment in 250 μM SA-treated 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 coumarin-related compounds (umbelliferone and herniarin) was not affected
by SA treatments, while (Z)- and (E)-2-β-d-glucopyranosyloxy-4-methoxycinnamic acids increased in the 250 μM SA-treated 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 roots. |
| |
Keywords: | Chamomile Oxidative stress Phenolic metabolism Salicylic acid elicitation |
本文献已被 PubMed SpringerLink 等数据库收录! |
|