The Effect of Light and Soil Moisture on the Environmental Behavior of Newts (Triturus vittatus vittatus, Urodela): A Detailed Study

2021 ◽  
pp. 37-45
Author(s):  
Gad Degani
Keyword(s):  
Soil Moisture ◽  
Environmental Behavior ◽  
Effect Of Light

Influences of Temperature, Light and Water Stress on Germination of Fringed Sage (Artemisia frigida)

Weed Science ◽  
1995 ◽  
Vol 43 (2) ◽  
pp. 219-225 ◽  
Author(s):  
Yuguang Bai ◽  
James T. Romo ◽  
James A. Young
Keyword(s):  
Soil Moisture ◽  
Water Stress ◽  
Germination Rate ◽  
Early Summer ◽  
Artemisia Frigida ◽  
Wide Range ◽  
Winter Temperatures ◽  
Osmotic Potentials ◽  
Germination Requirements ◽  
Effect Of Light

Experiments were conducted to determine the influences of temperature, light, winter storage, and water stress on seed germination of fringed sage. Seeds collected in 3 yr in central Saskatchewan were placed in sealed vials and buried in the soil after harvest, and germination was tested in spring and early summer. Seeds germinated over a wide range of temperatures with alternating 25/15 C being optimal. The range of optimal temperatures was higher for older seeds than younger seeds. The stimulating effect of light on germination varied among collections and incubating temperatures. Total germination and germination rate was limited by water stress and no seeds germinated at osmotic potentials below −0.9 MPa. Seeds hydrated in the autumn and exposed to low winter temperatures had higher germination the following spring than dry seeds exposed to the same conditions. Results suggest that sufficient soil moisture combined with moderate seedbed temperatures are optimal for fringed sage germination. Periodicity of germination may be influenced by variable germination requirements in different aging seeds.

scholarly journals Effect of light and soil moisture on physiological variables in six Mediterranean forest species planted under a pine forest canopy

2019 ◽  
Vol 25 (3) ◽  
pp. 461-476
Author(s):  
María E. Granados García ◽  
◽  
Esteban Chirino Miranda ◽  
Cristina Gandía Navalón ◽  
Victoriano R. Vallejo Calzada ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Forest Canopy ◽  
Pine Forest ◽  
Mediterranean Forest ◽  
Forest Species ◽  
Physiological Variables ◽  
Effect Of Light

Effect of light intensity on the ultrastructure of the filamentous cyanobacterium, Anabaena variabilis

1988 ◽  
Vol 46 ◽  
pp. 300-301
Author(s):  
C. S. Bricker ◽  
S. R. Barnum ◽  
B. Huang ◽  
J. G. Jaworskl
Keyword(s):  
Fatty Acid ◽  
Light Intensity ◽  
Acid Content ◽  
Fatty Acid Content ◽  
Anabaena Variabilis ◽  
Chloroplast Envelope ◽  
Major Constituent ◽  
Filamentous Cyanobacterium ◽  
Photosynthetic Membrane ◽  
Effect Of Light

Cyanobacteria are Gram negative prokaryotes that are capable of oxygenic photosynthesis. Although there are many similarities between eukaryotes and cyanobacteria in electron transfer and phosphorylation during photosynthesis, there are two features of the photosynthetic apparatus in cyanobacteria which distinguishes them from plants. Cyanobacteria contain phycobiliproteins organized in phycobilisomes on the surface of photosynthetic membrane. Another difference is in the organization of the photosynthetic membranes. Instead of stacked thylakolds within a chloroplast envelope membrane, as seen In eukaryotes, IntracytopIasmlc membranes generally are arranged in three to six concentric layers. Environmental factors such as temperature, nutrition and light fluency can significantly affect the physiology and morphology of cells. The effect of light Intensity shifts on the ultrastructure of Internal membrane in Anabaena variabilis grown under controlled environmental conditions was examined. Since a major constituent of cyanobacterial thylakolds are lipids, the fatty acid content also was measured and correlated with uItrastructural changes. The regulation of fatty acid synthesis in cyanobacteria ultimately can be studied if the fatty acid content can be manipulated.

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