Abstract
Analysis of changes in chlorophyll fluorescence parameters in strawberry leaves was based on a field experiment performed in the years 2009–2010. Ten genotypes including 5 cultivars: ‘Kent’, ‘Teresa’, ‘Senga Sengana’, ‘Chandler’ and the breeding clone 1387 as well as their inbred progeny, were the object of the study. During the experiment the following indicators were evaluated: chlorophyll a and b content in fresh leaf mass as well as fluorescence parameters: minimum (F0) and maximum fluorescence yield (Fm), photochemical efficiency of PS II (Fv/Fm), actual quantum yield of PSII photochemistry (Y), minimum (F0’) and maximum efficiency of fluorescence (Fm’) in the light, coefficient of photochemical (qP) and non-photo- chemical (qN) fluorescence quenching. In this work, we also examined the effect of repeated inbreeding on strawberry fruit yield and yield components. The analysis of changes of these parameters showed that inbreeding caused a reaction in all tested cultivars. In all inbred progeny, chlorophyll a and b content decreased compared to the cultivars. Generally, the photoche- mical efficiency of photosystem II (Fv/Fm) and the parameter ΔF/ Fm’ were not affected by strong inbreeding. In analyzing the values of the coefficients qP and qN, it has been observed that changes in their values depend on the sensitivity of the examined genotypes to self-pollination. The functioning of PS II is the most sensitive indicator of the effect of various factors on plants and is useful, among others, in breeding to select plants with a required genotype. The yield – determining features such as: fruit yield per plant, weight of single fruit, number of fruit per plant and weight of leaves per plant in S3 generation, were lower as compared with parental forms.
Highlights
Photosynthesis is a basic physiological process of plants with external and internal conditions
Chlorophyll fluorescence measurements are completely non-invasive, allowing photosynthesis to be studied in vivo
The results obtained from FC induction measurements allow us to assess the progress and performance of photochemical reactions of light-phase photosynthesis leading to the formation of the so-called ‘assimilation power’ and its relationship to enzymatic reactions of photosynthesis
Summary
Photosynthesis is a basic physiological process of plants with external and internal conditions. Measurement of chlorophyll fluorescence largely replaces the conventional measurements of the rate of photosynthesis and is a highly sensitive plant photosynthetic reaction attempt [1,2]. Chlorophyll fluorescence measurements are completely non-invasive, allowing photosynthesis to be studied in vivo. This method is useful when the effects of different environmental factors [3,4,5,6], and biotic stress [7,8] on plants are studied. Inbreeding generally increases homozygosity in plants and more homozygous genotypes may be susceptible to environmental harshness. Outcrossing usually increases or maintains heterozygosity that tends to produce genotypes better able to buffer themselves against environmental variability [9]. Inbreeding depression, the reduction in fitness of progeny derived from inbreeding relative to those derived from outcrossing, is invoked to explain the maintenance of the plant mating system [10]
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