| Název článku: | Vztah vodního stresu měřeného tlakovou komorou k ujímavosti semenáčků borovice lesní vystavených vysychání |
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| Číslo: | 1 |
| Rok: | 2019 |
| Autor: | Jan Leugner, Jarmila Martincová, Evelína Erbanová |
In order to determine the possible disturbance of the planting material by incorrect manipulation, the method of plant moisture stress (PMS) assessment was used. Two-year-old Scots pine (Pinus sylvestris L) seedlings collected on two different dates in two forest nurseries were used. Seedlings were exposed to controlled drying – loosely distributed on the shelves in the laboratory with exposed roots for 2, 4 and 6 hours. For fresh and exposed seedlings the plant water stress PMS was measured by the pressure chamber and the water content in the above-ground parts and roots gravimetrically as the differences between fresh weight and dry matter. Other seedlings of the same treatments were planted in outdoor conditions. Naked roots lost water 2 to 3 times faster than shoots. During drying significantly increased water stress PMS (3–7 bars in unexposed, more than 13 bars after 2 hours and 18.5 to nearly 30 bars after 4 and 6 hours of exposure). PMS significantly correlated with water content in roots and shoots. The high PMS values also corresponded to high mortality (no loss in unexposed seedlings, 25–55% after 2 hours and more than 80% after 4 and 6 hours of drying). For more information see Summary at the end of the article.
