scholarly journals (402) Effect of Light Quality on Growth and Essential Oil Composition in Rosemary

HortScience ◽  
2005 ◽  
Vol 40 (4) ◽  
pp. 1062C-1062
Author(s):  
Giuliana Mulas ◽  
Lyle E. Craker
Keyword(s):  
Essential Oil ◽  
Light Quality ◽  
Biomass Yield ◽  
Red Light ◽  
Plant Morphology ◽  
Essential Oil Composition ◽  
Light Conditions ◽  
Oil Composition ◽  
Number Of Leaves ◽  
Effect Of Light

Variation in light quality is known to modify plant morphology, growth, and chemical constituency in plants. In the present study, the effect of light quality on growth and essential oil composition in rosemary (Rosmarinus officinalis L.) was investigated by comparing plants receiving supplemental red (660 nm) and far-red (730 nm) with each other and with control plants not receiving supplemental light. Except for the supplemental light treatments, all plants were grown under natural light conditions in a greenhouse and received full daylight, averaging 9.23 h/day during the study. The red and far-red light treatments, given as day extensions, started daily 15 min before sunset and continued for 4 h each evening for 4 weeks. No significant differences were observed in biomass yield from the different light treatments, but far-red light caused elongation of internodes and a reduction in the number of leaves in comparison with control and red-light treated plants. Essential oil production was highest in plants grown under far-red light treatments.

scholarly journals The Role of Leaves in Photocontrol of Flower Bud Abscission in Hibiscus rosa-sinensis L. `Nairobi'

2000 ◽  
Vol 125 (1) ◽  
pp. 31-35 ◽  
Author(s):  
Uulke van Meeteren ◽  
Annie van Gelder
Keyword(s):  
Light Quality ◽  
Light Exposure ◽  
Red Light ◽  
Light Conditions ◽  
Flower Bud ◽  
Light Emitting ◽  
Hibiscus Rosa Sinensis ◽  
Number Of Leaves ◽  
Whole Plants

When compared with exposure to darkness, exposing Hibiscus rosa-sinensis L. `Nairobi' plants to red light (635 to 685 nm, 2.9 μmol·m-2·s-1) delayed flower bud abscission, while exposure to far-red light (705 to 755 nm, 1.7 μmol·m-2·s-1) accelerated this process. Flower bud abscission in response to light quality appears to be controlled partly by the presence of leaves. The delay of bud abscission was positively correlated to the number of leaves being exposed to red light. Excluding the flower buds from exposure to red or far-red light, while exposing the remaining parts of the plants to these light conditions, did not influence the effects of the light exposure on bud abscission. Exposing only the buds to red light by the use of red light-emitting diodes (0.8 μmol·m-2·s-1) did not prevent dark-induced flower bud abscission. Exposing the whole plants, darkness or far-red light could only induce flower bud abscission when leaves were present; bud abscission was totally absent when all leaves were removed. To prevent flower bud abscission, leaves had to be removed before, or at the start of, the far-red light treatment. These results suggest that in darkness or far-red light, a flower bud abscission-promoting signal from the leaves may be involved.

Effect of Light Quality on the Biomass Yield, Photosystem 2 Fluorescence, and the Total Essential Oil Content of Ocimum basilicum

2020 ◽  
Vol 56 (3) ◽  
pp. 336-343
Author(s):  
V. S. Zotov ◽  
Yu. V. Bolychevtseva ◽  
S. A. Khapchaeva ◽  
I. V. Terekhova ◽  
V. V. Shubin ◽  
...  
Keyword(s):  
Essential Oil ◽  
Photosystem 2 ◽  
Oil Content ◽  
Light Quality ◽  
Biomass Yield ◽  
Ocimum Basilicum ◽  
Effect Of Light

scholarly journals Total biomass and essential oil composition of Ocimum gratissimum L. in response to broiler litter and phosphorus

2015 ◽  
Vol 17 (1) ◽  
pp. 18-25 ◽  
Author(s):  
S.M. PESSOA ◽  
N.A. HEREDIA ZÁRATE ◽  
M.C. VIEIRA ◽  
C. A. L. CARDOSO ◽  
N.R. POPPI ◽  
...  
Keyword(s):  
Essential Oil ◽  
Biomass Yield ◽  
Essential Oil Composition ◽  
Maximum Height ◽  
Total Biomass ◽  
Triple Superphosphate ◽  
Oil Composition ◽  
Broiler Litter ◽  
Phosphate Fertilization ◽  
Vegetative Cycle

The aim of this experiment was to evaluate the biomass yield and chemical composition of the essential oil of clove basil in response to doses of broiler litter (0, 5, 10, 15 and 20 t ha-1) added in presence of triple superphosphate (200 kg ha-1) or without it. Before the first harvest, the height of the plants increased significantly (34.42 cm) when 15 tonnes ha-1 broiler litter were added to the soil. However, after resprouting, the plant heights ranged only as a function of the vegetative cycle, with maximum height (76.0 cm) observed at 60 days. Phosphate fertilization also significantly influenced the leaf area (1.771 cm2 plant-1) during the first harvest. The fresh weight of leaves increased linearly in response to the addition of broiler litter (20 ton ha-1) with maximum yields of 1,709 and 7,140 kg ha-1 during the first harvest and regrowth, respectively. On average, the oil content of the leaves was 0.7%, with maximum performance (3.8 L ha-1) when 20 tonnes ha-1 of broiler litter were added on the soil. Eugenol was found to be the major compound of the essential oil (71.65%).

The Effect of Light Quality on the Germination of Eight Species From Sandy Habitats in Western Australia.

1993 ◽  
Vol 41 (3) ◽  
pp. 321 ◽  
Author(s):  
DT Bell
Keyword(s):  
Western Australia ◽  
Light Quality ◽  
Red Light ◽  
Monochromatic Light ◽  
Coastal Dunes ◽  
High Energy ◽  
Germination Percentage ◽  
Light Conditions ◽  
Light Inhibition ◽  
Effect Of Light

The impacts of darkness and a range of monochromatic light conditions on germination was documented for eight native and naturalized species growing in sandy habitats in Western Australia. Four lake-margin species, Juncus articulatus, J. microcephalus, J. pallidus and Isolepis prolifera, germinated under red (c. 520-640 nm) light, but remained dormant in the dark or when illuminated with far-red (720 nm) or blue (430-490 nm) light. Sunlight-stimulated germination could be beneficial to these very small seeded species, which may not have sufficient reserves for seedlings to establish following deep burial. Oenothera stricta, a short-lived ruderal species, was also stimulated by red light, a response possibly related to germination following disturbance of overlying vegetation. Trachyandra divaricata, a dune inhabiting species, was inhibited by red light. Inhibition by the wavelengths of light dominant in full sunlight was thought to be a response beneficial to species of blowing sand habitats where germination on the dry surface could prove detrimental. Oenothera drummorndii , also a species of coastal dunes was inhibited under high energy light (430-490 nm) but showed no percentage gemination differences in light of wavelengths between 520 and 720 nm and under dark conditions. Asphodelus fistulosus, a species of similar life-fonn characteristics to Trachyarndra divaricata, showed no effect on germination percentage of varying light quality.

Evaluation of the essential oil composition of fruits of three endemic species of Tornabenea from Cape Verde Islands

Planta Medica ◽  
2009 ◽  
Vol 75 (09) ◽  
Author(s):  
C Grosso ◽  
G Teixeira ◽  
I Gomes ◽  
ES Martins ◽  
JG Barroso ◽  
...  
Keyword(s):  
Essential Oil ◽  
Endemic Species ◽  
Essential Oil Composition ◽  
Cape Verde ◽  
Oil Composition ◽  
Cape Verde Islands

Comparative essential oil composition of fennel (Foeniculum vulgare Mill.) fruits collected during different three years

Planta Medica ◽  
2009 ◽  
Vol 75 (09) ◽  
Author(s):  
AC Aprotosoaie ◽  
V Floria ◽  
A Spac ◽  
A Miron ◽  
M Hancianu ◽  
...  
Keyword(s):  
Essential Oil ◽  
Essential Oil Composition ◽  
Oil Composition ◽  
Foeniculum Vulgare
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