Effect of light intensity and temperature on apparent photosynthesis of altitudinal ecotypes of Trifolium repens L.

Oecologia ◽  
1977 ◽  
Vol 31 (1) ◽  
pp. 73-78 ◽  
Author(s):  
F. Mächler ◽  
J. Nösberger
Keyword(s):  
Light Intensity ◽  
Trifolium Repens ◽  
Trifolium Repens L ◽  
Effect Of Light

Effect of light quality (red: far-red ratio) and defoliation treatments applied at a single phytomer on axillary bud outgrowth in Trifolium repens L.

Oecologia ◽  
1994 ◽  
Vol 100 (3) ◽  
pp. 236-242 ◽  
Author(s):  
Ch. Robin ◽  
M. J. M. Hay ◽  
P. C. D. Newton
Keyword(s):  
Trifolium Repens ◽  
Light Quality ◽  
Axillary Bud ◽  
Trifolium Repens L ◽  
Axillary Bud Outgrowth ◽  
Effect Of Light

Factors affecting the hydrogen cyanide potential of white clover (Trifolium repens L.)

1987 ◽  
Vol 38 (6) ◽  
pp. 1053 ◽  
Author(s):  
PJ Vickery ◽  
JL Wheeler ◽  
C Mulcahy
Keyword(s):  
Light Intensity ◽  
White Clover ◽  
Trifolium Repens ◽  
Dry Matter ◽  
Late Pregnancy ◽  
Moisture Stress ◽  
Early Spring ◽  
Cool Temperature ◽  
Trifolium Repens L ◽  
Phosphorus Application

Pot experiments were used to determine the effects of age, light, temperature, mineral nutrition and wilting on the HCN potential (HCNp ) of white clover (Trifolium repens L.). HCNp, adjusted for pre-expenmental HCNp, was reduced by higher light intensity (505 v. 220 mg HCN kg-1 DM), by increased temperature (408 v. 317 mg HCN kg-1 DM) and by phosphorus application (382 v. 343 mg HCN kg-1 DM). These effects were largely explained by the hypothesis that HCNp diminished as the size and vigour of the plant increased, and the use of dry matter production as a covariate on HCNp removed the significant effects of light, temperature and phosphorus. In two experiments wilting plants prior to harvest increased HCNp by 15 and 24%, and reduced dry matter yield by 9 and 13%. HCNp declined curvilinearly as the white clover aged. The conditions shown to favour high HCNp, namely, immaturity, moisture stress, low light intensity, cool temperature, and inadequate P supply, are those which occur periodically in the late autumn and early spring of temperate climates. Sheep in late pregnancy at this time, could, if white clover comprises a substantial proportion of their diet, experience thiocyanate absorption as a consequence of HCN detoxication and hence increase the risk of goitri to the lamb.

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.

Effect of light intensity and water aging on surface hardness of dental resin-composites

2019 ◽  
Vol 64 (11) ◽  
pp. 1007-1014
Author(s):  
Tong XU ◽  
◽  
Jia-Hui ZHANG ◽  
Zhao-Ying LIU ◽  
Xuan LI ◽  
...  
Keyword(s):  
Light Intensity ◽  
Surface Hardness ◽  
Resin Composites ◽  
Dental Resin ◽  
Dental Resin Composites ◽  
Effect Of Light

Enzimaktivitások és a fluoreszkáló pszeudomonasz csíraszámok változása a fehér lóhere (Trifolium repens L.) rizoszférájában sókezelés (NaCl) hatására

2004 ◽  
Vol 53 (3-4) ◽  
pp. 367-376 ◽  
Author(s):  
A. A. Khalif ◽  
H. Abdorhim ◽  
Hosam E. H. T. Bayoumi ◽  
Anna Füzy ◽  
Mihály Kecskés
Keyword(s):  
Pseudomonas Putida ◽  
Trifolium Repens ◽  
Trifolium Repens L

Üvegházi körülmények között savanyú barna erdotalajban nevelt fehér here (Trifolium repens L.) növények rizoszférájának sókezelés hatására bekövetkezo változását ellenoriztük. Megvizsgáltuk a különbözo sókoncentrációknak (0, 0,2, 0,4, 0,6 és 0,8 tömeg %) a baktériumnépesség összetételére és a különbözo talajenzimek aktivitására gyakorolt hatását.  Megállapítottuk, hogy a talaj sótartalma közvetlenül befolyásolta a rizoszférában található fluoreszkáló pszeudomonaszok csíraszámát. A legsurubb populáció a 0,2% NaCl-ot tartalmazó talajban volt mérheto, ahol a fluoreszkáló pszeudomonaszok között a Pseudomonas putida és a P. fluorescens fordultak elo a legnagyobb számban. A pszeudomonaszok ily módon jól tolerálják a talaj magas NaCl-tartalmát, és gyökérkolonizáló tevékenységet képesek kifejteni a magas NaCl-tartalmú talajban is. A sókoncentráció növelésével kezdetben (a 0,2-0,4%-os tartományban) jelentosen növekedett a dehidrogenáz, kataláz, és ureáz enzimek aktivitása. A proteáz enzimek aktivitásmaximuma a 0,1-0,2% NaCl-koncentráció tartományba esett. A 0,4%-nál magasabb koncentrációkban a kontrollhoz hasonló mértékure csökkent mind a négy enzim aktivitása, és a baktériumok száma is. A foszfatáz- és a b-glükozidáz-tevékenység viszont a NaCl-dózis növelése következtében a koncentrációval arányosan, jelentosen csökkent a kontrollhoz viszonyítva.  Feltételezésünk szerint az enzimaktivitások változását is a sókezelés hatására bekövetkezo mikrobióta összetételének megváltozása okozta.

Diurnal Flying Activity of a Neotropical Bat (Saccopteryx leptura): Effect of Light Intensity, Temperature, and Canopy Cover

2020 ◽  
Vol 22 (1) ◽  
pp. 87
Author(s):  
Isabela Vivas-Toro ◽  
Oscar E. Murillo-García
Keyword(s):  
Light Intensity ◽  
Canopy Cover ◽  
Effect Of Light

Effect of light intensity and nitrogen level on growth and biomass of Rauvolfia vomitoria

2010 ◽  
Vol 18 (1) ◽  
pp. 57-61
Author(s):  
Lei LI ◽  
Chuan-Tao CAI ◽  
Gui-Zhou LIU
Keyword(s):  
Light Intensity ◽  
Nitrogen Level ◽  
Rauvolfia Vomitoria ◽  
Effect Of Light
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