| Název článku: | Vliv simulovaného pozdního mrazu a následných světelných podmínek na fluorescenci chlorofylu a vitalitu rašících sazenic smrku ztepilého |
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| Číslo: | 2 |
| Rok: | 2016 |
| Autor: | Ondřej Špulák, Jarmila Martincová |
The article analyzes impact of simulated late frost and subsequent two levels of light conditions on damage of sprouting buds and chlorophyll fluorescence of one-year-old shoots of Norway spruce. There were three-year-old containerized seedlings exposed to low temperatures simulating two night frosts followed by days with different intensities of illumination in the plant growth chamber. Damage to sprouting buds (forming shoots) was visually evaluated. Chlorophyll fluorescence changes of one-year-old needles were monitored prior and after frost expositions. Young shoot damage of each tree was related to sprouting index of its lateral shoots. It was found that higher phase of sprouting corresponded to damage of sprouting buds as well as to disturbance of physiological state of older needles. Overcast day with lower light intensity following frost event lowers the damage of new sprouts as well as fluctuation of the fluorescence parameters of the older shoots of spruce in comparison to sunny day.
