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1
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Diurnal dynamics of stomatal conductance and leaf temperature of grapevines (Vitis vinifera L.) in response to daily climatic variables

100%
Sabir A., Yazar K.
Acta Scientiarum Polonorum. Hortorum Cultus
|
2015
|
tom 14
|
nr 4
Few studies examined the stomatal conductance (gs) characteristics of grapevines with an emphasis on daily climatic responses. In the present study, diurnal measurements on leaf temperature and gs of three grapevine cultivars (Alphonse Lavallée, Crimson Seedless and Italia) were carried out. The leaf temperature values for the cultivars at 08:30 were 25.0 ±1°C and it increased to a maximum value between 12:00 and 14:50 p.m. After an almost steady course, it decreased along with the decrease in ambient temperature. The gs values increased from morning (08:30 a.m.) to mid-morning (10:30 a.m.) for all the cultivars. After reaching a peak level at mid-morning, the gs decreased gradually from the mid-morning throughout the afternoon. In the morning, the highest and the least gs values were obtained from Italia (232 mmol H2O m-2 s-1) and Crimson Seedless (149.6 mmol H2O m-2 s-1) cultivars. At around 10:30, the gs for Italia, Crimson Seedless and Alphonse Lavallée were at the highest levels with their valus 287.7, 262.1 and 242.0 mmol H2O m-2 s-1, respectively. The last measurements on gs at around 16:10 varied from to 96.7 (Italia) to 112.0 mmol H2O m-2 s-1 (Alphonse Lavallée). During the daily time course, the gs depended mainly on irradiance. Tleaf showed a strong relationship with Tair for all the cultivars. There was a strong, but negative correlation between leaf temperature and air humidity for all the cultivars.
2

Modifications in acid growth and cell wall proteins of soybean shoots [Glycine max L. Merr] induced by the reduction of blue light content in sunlight

100%
Urysiak P. E.
Polish Journal of Natural Sciences. Supplement
|
2003
|
tom 01
3

Focusing of sunlight by sea surface waves : new results from the Black Sea

100%
Dera J., Sagan S., Stramski D.
Oceanologia
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1993
|
tom 34
4
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The study of colour changes of chosen species of wood from Southeast Asia caused by transparent coatings and exposure to sunlight

80%
Jankowska A., Szczesna M.
Drewno. Prace Naukowe. Doniesienia. Komunikaty
|
2011
|
tom 54
|
nr 185
In recent years the interest in exotic wood species has been increasing, which was caused by these species’ specific properties. The aesthetic effect of the material, especially the colour, is the most important aspect. Unfortunately, wood is susceptible to strong discolouration caused by the coating process or exposure to sunlight. This paper describes the influence of these factors on the colour stability of Asian teak, merbau and kempas wood species that are mainly used for flooring. It was proved, using spherical spectrophotometer, that uncoated wood became darker when exposed to the action of varnishes and sunlight. Lacquering, waxing and shellac lacquering of wood does not protect it against discolouration, but makes the colour more even on the whole surface.
5
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Effect of sunlight on phenolic compounds accumulation in coniferous plants

70%
Brzezinska E., Kozlowska M.
Dendrobiology
|
2008
|
tom 59
3-7
The effect of light conditions on the accumulation of phenolic compounds was investigated in the needles of one-year and two-year old shoots, collected from perennial specimens of common yew (Taxus baccata L.), American arborvitae (Thuja occidentalis L.) and common juniper (Juniperus communis L.), growing in an urban garden. The content of total phenols and flavones was partially related to the light requirement or light tolerance of conifer tree. In Taxus needles, a shade-loving species, higher accumulation of phenolic metabolites was observed under shaded condition (in two-year old shoots) and was linked with the growth intensity in spring. In Thuja and particularly in Juniperus, the level of phenolics was related to the insolation intensity, probably so as a part of the adaptation mechanism.
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