Acta Univ. Agric. Silvic. Mendelianae Brun. 2015, 63(5), 1575-1579 | DOI: 10.11118/actaun201563051575
The Impact of Different Water Regime on Chlorophyll Fluorescence of Pyrus pyraster L. and Sorbus domestica L.
- Department of Planting Design and Maintenance, Horticulture and Landscape Engineering Faculty, Slovak University of Agriculture in Nitra, Tr. A Hlinku 2, 949 76 Nitra, Slovak Republic
The water deficit is considered to be significant cause of photosynthesis defects. Measuring of chlorophyll fluorescence is one of the methods revealing defects in the photosynthetic apparatus. The experiment was established with two woody plant (Pyrus pyraster L. and Sorbus domestica L.) cultivated in two different regimes of the substrate saturation. The measurement of the modulated fluorescence of chlorophyll a was done by FMS1 fluorometer during three-week period between June and September (2012 and 2013). There were analysed selected parameters of chlorophyll fluorescence: Fv/Fm - maximum quantum efficiency of PSII, ΦPSII - effective quantum yield of PSII and RFD - chlorophyll fluorescence decrease ratio. According to the obtained results, Pyrus pyraster has probably higher potential for adaptation to water deficiency. There were recorded the significant decreases mainly in the values of parameter RFD and ΦPSII for Sorbus domestica within duration of experiment with different water regime in both growing seasons 2012 and 2013. The results document a weak sensitivity of the parameter Fv/Fm on changes in the amount of available water in the substrate in both taxa.
Keywords: chlorophyll fluorescence, woody plants, drought, water deficit, xerophytic plants
Grants and funding:
The research was supported by research grant projects VEGA [1/0246/13] "Strategies of the water utilization by xerophytic woody plants and perennials in urban conditions and landscape" from Slovak Grant Agency for Science. This work was co-funded by European Community under project No. 26220220180: Building Research Centre "AgroBioTech".
Prepublished online: October 29, 2015; Published: December 1, 2015 Show citation
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