scholarly journals Effects of Relative Light Intensity on the Growth, Yield and Curcumin Content of Turmeric (Curcuma longa L.) in Okinawa, Japan

2009 ◽  
Vol 12 (1) ◽  
pp. 29-36 ◽  
Author(s):  
Mohammad Amzad Hossain ◽  
Hikaru Akamine ◽  
Yukio Ishimine ◽  
Ryo Teruya ◽  
Yoko Aniya ◽  
...  
Keyword(s):  
Light Intensity ◽  
Curcuma Longa ◽  
Growth Yield ◽  
Relative Light Intensity

Beech sapling architecture following small and medium gap disturbances in silver fir-beech old-growth forests in Slovenia

2005 ◽  
Vol 156 (12) ◽  
pp. 481-486 ◽  
Author(s):  
Jurij Diaci ◽  
Lahorka Kozjek
Keyword(s):  
Light Intensity ◽  
Quality Characteristics ◽  
Stem Length ◽  
Silver Fir ◽  
Beech Forests ◽  
Vertical Growth ◽  
Relative Light Intensity ◽  
Stem Bending ◽  
Negative Effect

The objective of our research was to examine the effect of canopy shading on beech sapling architecture in the oldgrowth silver fir-beech forests of Pecka and Rajhenavski Rog. In August 2003 we sampled one plot (352 m2) in a large gap in Pecka, which was a result of a strong windstorm in 1983, and eight small gaps (26–78 m2) with similar sapling heights (3.8–8 m). A ground view of each gap was drawn including the characteristics of gap border trees and the density of separate sapling layers was recorded. The height and diameter were measured for each sapling, as well as the following quality characteristics on selected dominant saplings: width of the crown,number of larger branches and knots (>1/3 DBH), intensity of stem bending, deviation from vertical growth, number of terminal shoots, and the type of damage. The results show a negative effect of high canopy shading (estimated relative light intensity was below 5%) on the architectural quality of saplings. A lower overall density of saplings, greater intensity of bending and deviation from vertical growth, a shorter stem length without branches, a larger number of saplings with two terminal shoots, and a larger number of damaged saplings were observed in small gaps.

scholarly journals Interaction of Light Intensity and CO2 Concentration Alters Biomass Partitioning in Chrysanthemum

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Maral Hosseinzadeh ◽  
Sasan Aliniaeifard ◽  
Aida Shomali ◽  
Fardad Didaran
Keyword(s):  
Light Intensity ◽  
Growth Management ◽  
Growth Yield ◽  
Dry Weight ◽  
Co2 Concentration ◽  
Photosynthetic Photon Flux Density ◽  
Biomass Partitioning ◽  
Photon Flux ◽  
Photon Flux Density ◽  
Vegetative Organs

Abstract Biomass partitioning is one of the pivotal determinants of crop growth management, which is influenced by environmental cues. Light and CO2 are the main drivers of photosynthesis and biomass production in plants. In this study, the effects of CO2 levels: ambient 400 ppm (a[CO2]) and elevated to 1,000 ppm (e[CO2]) and different light intensities (75, 150, 300, 600 μmol·m−2·s−1 photosynthetic photon flux density – PPFD) were studied on the growth, yield, and biomass partitioning in chrysanthemum plants. The plants grown at higher light intensity had a higher dry weight (DW) of both the vegetative and floral organs. e[CO2] diminished the stimulating effect of more intensive light on the DW of vegetative organs, although it positively influenced inflorescence DW. The flowering time in plants grown at e[CO2] and light intensity of 600 μmol·m−2·s−1 occurred earlier than that of plants grown at a[CO2]. An increase in light intensity induced the allocation of biomass to inflorescence and e[CO2] enhanced the increasing effect of light on the partitioning of biomass toward the inflorescence. In both CO2 concentrations, the highest specific leaf area (SLA) was detected under the lowest light intensity, especially in plants grown at e[CO2]. In conclusion, elevated light intensity and CO2 direct the biomass toward inflorescence in chrysanthemum plants.

An apparatus for the instantaneous measurement of the relative light intensity

1968 ◽  
Vol 11 ◽  
Author(s):  
G. Vyncke ◽  
R. Goossens
Keyword(s):  
Light Intensity ◽  
Forest Canopy ◽  
Light Condition ◽  
Forest Stand ◽  
Point Of View ◽  
Closed Circuit ◽  
Neutral Density ◽  
A Value ◽  
Relative Light Intensity

An  apparatus for the instantaneous measurement of the relative light intensity  was constructed by Brechtel (1962). An analogical apparatus was built, from  the same point of view, but on another principle. Namely two selenium  photo-cells, connected in opposition, produce anti-currents in a closed  circuit. The differential current is compensated or reduced to zero by a  linear potentiometer.     The position of this potentiometer can be related to a value for the  relative ratio between the light intensity above and below the forest canopy.  The neutral density filters, which are necessary for the used photo-cells,  can enlarge the reading scale, if they are chosen judiciously.     Some positive measurements were done in a forest stand. Generally the  apparatus will give good results and will be easily used for the  characterization of light condition in forest stands.

Decreased TK activity alters growth, yield and tolerance to low temperature and low light intensity in transgenic cucumber plants

2014 ◽  
Vol 34 (2) ◽  
pp. 345-354 ◽  
Author(s):  
Huangai Bi ◽  
Xubing Dong ◽  
Guoxiu Wu ◽  
Meiling Wang ◽  
Xizhen Ai
Keyword(s):  
Low Temperature ◽  
Light Intensity ◽  
Growth Yield ◽  
Low Light ◽  
Low Light Intensity
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