Fig. 19From: Modifications in steroid and triterpenoid metabolism in Calendula officinalis plants and hairy root culture in response to chitosan treatmentContent of total chlorophyll a + b (A), chlorophyll a (B) and chlorophyll b (C) in C. officinalis leaves. C- control, CH- chitosan elicited samples. Bars which do not share a common letter are significantly different. Capital letters indicate significant difference in time between plants from the same treatment, lowercase indicate difference between treatments within certain time pointBack to article page