Concluding remarks

4. Concluding remarks

Different authors assume that diverse mechanisms are involved in the response

to UV-B and UV-C radiation, although the high fluency of both radiations could lead to similar damages (generation

of ROS, DNA damage, etc.) in plant organisms (Stapleton, 1992; Fukushima and Saito, 2000; Casati and Andreo, 2001; Katerova and Prinsen, 2008; Katerova et al., 2009). As a result, UV-C exposure has been documented to be an unusable model to study UV-B induced physiological responses by cheaper facilities (Stapleton, 1992). Nevertheless, several authors have documented that

short-time UV-C could induce higher production of some valuable secondary metabolites when compared to UV-B in saffron thistle (Carthamus tinctorius L.), pepper (Capsicum annuum L.), or Artemisia annua L., (Fukushima and Saito, 2000; Mahdavian et al., 2008; Rai et al., 2011). However, higher accumulation of the studied secondary metabolite

Katerova et al.

compounds (carthamin, artemisinin, is not extensively studied. The existing rutin) is associated with induction of

data give us ground to propose that it negative effects on plants (inhibition of

is essential to extend the investigations florets elongation, growth, or reduction

using low doses of UV as elicitors for in chlorophyll a and chlorophyll b)

secondary metabolite production. expressed much more after exposure to UV-C than to UV-B radiation. UV-B has

Acknowledgments

high elicitation potential for secondary Research was supported by National metabolite production, comparable with

Science Fund of Bulgaria – Project for salicylic acid (in cell culture of Chinese

Junior Scientists DMU 03/55 (leader Dr. medicinal tree), or even higher than methyl

K. Tasheva).

jasmonate (in Passiflora quadrangularis callus cultures) (Antognoni et al., 2007;

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