Interrelations between Chlorophyll Fluorescence Parameters as a Tool for the Detection of Seasonal Changes in Photosystem II Kinetics in Two Strawberry (Fragaria X Ananassa Duch.) Cultivars
correlation, environment, genotype, interaction, photosynthesis
Abstract
The aim of this study was to establish relationships between parameters of chlorophyll fluorescence in two strawberry cultivars in order to detect the seasonal changes in their photosystem II (PSII) kinetics. Parameters of chlorophyll fluorescence (CF) such as: Fo, Fm, Fv/Fm, Fo`, Fm`, qP, qN and Y were measured in mature leaves of two strawberry cultivars 'Teresa' and 'Honeoye' in a late spring and an early autumn. Fluorescence of dark-adapted leaf samples was measured in the laboratory at room temperature, with the use of a portable pulse amplitude modulation (PAM) fluorometer in fifteen replicates for each parameter. Relationships between CF parameters calculated on the basis of Pearson's correlation coefficients were highly differentiated in the analyzed cultivars and depended on the genotype and its specific response to the various environmental conditions characterizing both seasons of the year. In cv.'Teresa' highly positive significant correlation was observed between qP-Fm` and Fm`-Fo` in the autumn, and highly negative significant correlation was calculated between qN-Fo in the spring. In cv. 'Honeoye' the strongest positive significant correlation was evaluated between Y-Fm` in the autumn and between Fv/Fm - Fo in the spring. Besides, in the autumnal measurements the relationship between qP-Fo` was positively significant, but correlation between Fv/Fm-Fo was significantly negative in this cultivar. Differences observed between spring and autumnal CF relationships in both cultivars reflected the seasonal changes in their photosystem II kinetics. The different distribution of photons in the photosystem II responded to various light intensity and/or temperature characterizing the spring and autumn environmental conditions. In cv.'Honeoye' these changes were more evident when compared to cv.'Teresa'. The functioning of PSII in leaves of cv.'Teresa' was more stable in both seasons of the year. On the other hand, it could be stated, that the strongest significant relationships established between CF parameters in the analyzed strawberry genotypes might be applicable as the reliable 7 1 indices of stability in their photosynthetic apparatus functioning in different seasons of the year.
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