engleski

Guaiacol peroxidases and photosynthetic pigments in ageing spruce needles

Changes in the guaiacol peroxidases activity, electrophoretic pattern, photosynthetic pigments content and photosystem II efficiency in spruce (Picea abies L. Karst.) needles of different ages were investigated. Four generations of needles (current-year, one-, two- and three-year-old) were collected from ten Norway spruce trees. Similar Fv/Fm values (the ratio of variable and maximal fluorescence) in all investigated needles indicate that they were healthy with a fully functional photosystem II. There was a significant increase in photosynthetic pigments content during the first year development. Total guaiacol peroxidases activity was increasing continuously during needles maturation. Significant differences were recorded between the current-year and older needles, as well as between the one-year-old and three-year-old needles. Also, the expression of new isoforms of peroxidases was observed in one-year-old needles compared to current-year needles. The obtained results show that Norway spruce needles were subjected to most pronounced biochemical and molecular changes during the first year development.

guaiacol peroxidases; photosynthetic pigments; ageing needles; Picea abies; Fv/Fm

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