The use of ontogenetic approach for the Kautsky curve recording during the stress impact on colewort plants

In the study the changes of the chlorophyll induc-tion curve’s shape for colewort (Bansei Maruba) leaves in normal and under the reversible stress in the conditions of light culture were investigated. The use of the chlorophyll fluorescence induction (CFI) tech-niques was linked with applying the ontogenetic ap-proach that was earlier introduced by the authors for the data analysis. This approach was used only with numerical parameters till now. In this study the onto-genetic approach was used to compare the CFI curve shapes that also have age dependence for the leaves. The stress conditions were realized as a 3-day water deficit. Comparison of the parameters and the curve shapes of the colewort leaves’ CFI was ex-ecuted in the normal, stressed and reparation condi-tions. The analysis of CFI parameters showed that colewort plant response to stress conditions was completely reversible. It was shown that the consider-ing of the CFI curve’s shape changes for reversible stress conditions with the help of formally used on-togenetic approach can result into erratic assump-tion of “rejuvenation” effect. The data obtained has led to the conclusion that the well known thesis of similarity between the stress-induced changes and the aging processes in plants should be corrected. However, the ontogenetic approach as an element of complex integral analysis of plants’ condition has demonstrated the ability to detect the plant organ-ism’s changes.