scholarly journals Effects of light exposure in freezing temperatures on winter damage to foliage of Norway spruce container seedlings in mid and late winter: Pilot experiments in an open field

2016 ◽  
Vol 61 (No. 1) ◽  
pp. 35-44
Author(s):  
Heiskanen Juha ◽  
Sutinen Sirkka ◽  
Hyvönen Juha
Keyword(s):  
Norway Spruce ◽  
Open Field ◽  
Light Exposure ◽  
Late Winter ◽  
Container Seedlings ◽  
Freezing Temperatures

scholarly journals Extending the planting period of dormant and growing Norway spruce container seedlings to early summer

Silva Fennica ◽  
2005 ◽  
Vol 39 (4) ◽  
Author(s):  
Jaana Luoranen ◽  
Risto Rikala ◽  
Kyösti Konttinen ◽  
Heikki Smolander
Keyword(s):  
Norway Spruce ◽  
Early Summer ◽  
Container Seedlings

scholarly journals Waterlogging under simulated late-winter conditions had little impact on the physiology and growth of Norway spruce seedlings

2013 ◽  
Vol 70 (8) ◽  
pp. 781-790 ◽  
Author(s):  
Ai-Fang Wang ◽  
Marja Roitto ◽  
Tarja Lehto ◽  
Janusz J Zwiazek ◽  
Mónica Calvo-Polanco ◽  
...  
Keyword(s):  
Norway Spruce ◽  
Late Winter ◽  
Winter Conditions

scholarly journals Covering Norway spruce container seedlings with reflective shading cloth during field storage affects seedling post-planting growth

New Forests ◽  
2021 ◽  
Author(s):  
Mikko Tikkinen ◽  
Johanna Riikonen ◽  
Jaana Luoranen
Keyword(s):  
Norway Spruce ◽  
Grey Mould ◽  
Storage Conditions ◽  
Climatic Conditions ◽  
Test Field ◽  
Stem Water Potential ◽  
Negative Effects ◽  
Seedling Mortality ◽  
Container Seedlings ◽  
Growing Seasons

AbstractThe field storage of container seedlings is often a necessity after the seedlings have been transported from nurseries close to the regeneration area. Suboptimal storage conditions can lead to reduced growth or even seedling mortality. Supporting favourable conditions for the seedlings during storage requires labour, especially for the watering of seedlings, and therefore increases the costs of forest regeneration. In this study, we examined the effects of covering Norway spruce container seedlings with a reflective shading cloth and neglecting the watering during field storage. This was done by measuring the drying of the seedlings during field storage, the rooting of the seedlings when planting, and the subsequent survival and performance in the field two and three growing seasons after planting. The study comprised one-year-old Norway spruce container seedlings covered with reflective shading cloth and seedlings with no cover (subject to rainfall) in 2012 and 2013; additionally, in 2013, replicates from both treatments were stored in conditions where rainfall was impeded. The stem water potential was measured, a rooting test was carried out, and the seedlings were planted in the test field weekly over 42 days of field storage without watering. As a novel finding, the results indicate that covering the seedlings with a reflective shading cloth during the field storage increased the risk of grey mould in summer storage and led to negative effects regarding post planting seedling development. The application of a shading cloth directly on the seedlings cannot be recommended to prolong the watering intervals during field storage in the current climatic conditions in Southern Finland, where the risk of grey mould is high.

scholarly journals Prooxidant-Antioxidant Balance in the Heart of Rats with Different Behavioral Activities under the Conditions of Light Exposition

2021 ◽  
Vol 6 (3) ◽  
pp. 360-365
Author(s):  
L. D. Chebotar ◽  
◽  
E. N. Laricheva ◽  
M. Sh. Gilmutdinova
Keyword(s):  
Lipid Peroxidation ◽  
Antioxidant Activity ◽  
Superoxide Dismutase ◽  
Open Field ◽  
Emotional Stress ◽  
Light Exposure ◽  
Superoxide Dismutase Activity ◽  
Main Role ◽  
Experimental Animals ◽  
Behavioural Activity

The purpose of the article. The article shows that the effect of round-the-clock lighting causes changes in the processes of lipid peroxidation and antioxidant activity in rats, and depends on their behavioural activity. The effects of lighting on the processes of oxidative metabolism of varying degrees in the heart of resistant and unstable to emotional stress rats. Materials and methods. Investigations were carried out on 32 mature Wistar rats, divided into four groups: group 1 – animals resistant to emotional stress (intact); group 2 – intact animals unstable to emotional stress; group 3 – experimental animals resistant to emotional stress (30-day light exposure (1000 lux)); group 4 – experimental animals, unstable to emotional stress (30-day light exposure (1000 lux)). When assessing the effect of light on the state of the organism, the most important integral indicator is the behavior of animals. Therefore, during the experiment we used the observation of behavioral reactions in the test “open field”. Based on the characteristics of the behavior of animals in the “open field” rats were divided into groups resistant and unstable to emotional stress. To assess lipid peroxidation in the heart homogenate, the concentration of TBA-active products, the concentration of diene, oxidiene and triene conjugates were determined. Antioxidant processes were assessed by the increase in the concentration of TBA- active products during 1.5-hour incubation in an iron-ascorbate buffer solution, as well as by the activity of superoxide dismutase and catalase. Results and discussion. Prooxidant activity was characterized by an increase in the concentration of TBA-reactive substances in animals resistant to emotional stress. The concentration of TBA-reactive substances after 1.5-hour incubation increased in both experimental groups. Changes in the antioxidant status were illustrated by an increase in superoxide dismutase activity in the group of stress-unstable rats, whereas catalase activity increased in both experimental groups. In addition, in the group of animals resistant to emotional stress, a significant decrease in the resources of α-tocopherol and β-carotene was revealed. Conclusion. The long-term light exposure promotes the formation of end products of peroxidation in the heart of rats resistant to emotional stress and causes a decrease in antioxidant potential, regardless of behavioural activity. Antioxidant activity in the heart of emotionally stress-resistant rats is realized through both the enzyme and non-enzyme links of the antioxidant defence, while the main role in the heart of emotionally stress-resistant rats is played by superoxide dismutase activity

Effect of Drought on Growth and Mortality of Actively Growing Norway Spruce Container Seedlings Planted in Summer

2002 ◽  
Vol 17 (3) ◽  
pp. 218-224 ◽  
Author(s):  
Pekka Helenius ◽  
Jaana Luoranen ◽  
Risto Rikala ◽  
Kari Leinonen
Keyword(s):  
Norway Spruce ◽  
Container Seedlings
Sign in / Sign up

Export Citation Format

Share Document