LED Light Spectrum Affects the Photosynthetic Performance of Houttuynia Cordata Seedlings

Abstract

Abstract:We investigated the effects of light-emitting diodes (LED) with various light spectrum (white, red, yellow, green and blue) on photosynthesis of Houttuynia cordata seedlings. The seedlings were either cultivated under florescent lamp or under various LED lights. The leaves were collected and chlorophyll fluorescence parameters, the contents of chlorophyll, soluble sugar and relative water were measured, chloroplasts were observed as well. The results showed chlorophyll fluorescence parameters as Fv/Fm, qP and qY values were the highest under blue LED light and the values were the lowest under green LED light. Red LED light resulted in the enhanced chlorophyll content compared with the other LED lights, and the chl a/chl b ratio did not change significantly among LED treatments. The soluble sugar content was not significantly different among the treatments. The red LED increased relative water content and the green LED decreased the water content. Observation of chloroplasts in the leaves of Houttuynia cordata seedlings showed chloroplast number and distribution were altered by various light spectrum where chloroplasts were smaller under blue LED, and appeared to be more scattered under red LED. Our results indicated that photosynthesis of Houttuynia cordata seedlings respond differently to various light spectrum emitted by florescent lamp and LED.

The Growth and Development of Sweet Basil (Ocimum basilicum) and Bush Basil (Ocimum minimum) Grown under Three Light Regimes in a Controlled Environment

“…Fv/Fm is sensitive to the light conditions and therefore lower values of Fv/Fm can indicate stress via photo-inhibition. Fv/Fm is related to the quantum yield in PS II as other studies have shown similar results where Blue LEDs increased photochemical quenching whilst Red LEDs enhanced chlorophyll content despite chloroplasts being smaller [52]. The current analysis has shown that a combination of Blue (459 nm) and Red (632 nm) LED lights can promote a higher Fv/Fm than HPS or white LED lights of the same PAR output.…”

“…Both of these studies showed the low impact of green light on stomatal opening. Red and blue wavelengths are both utilized during photosynthesis by chlorophyll and secondary pigments, therefore promoting growth and development in plants [52,54]. A recent study sought to un-pick the influences of Red and Blue light on growth and photosynthetic efficiency in sweet basil and found that quantum efficiency in PSII was lower under Red/Blue LED light arrays when the Red portion of the light array was greater than double the Blue (2:1).…”

Effects of light intensity and spectral composition on the growth and metabolism of spinach (SPINACIA OLERACEA L.)

“…Photosynthetic pigments absorb and convert the light energy into chemical energy via complex photosynthetic machinery. Blue and red light play an active role in photosynthesis and also stimulate chlorophyll and carotenoid biosynthesis (Xiao-Xue et al 2013, Wang et al 2015. In the present study, light intensity caused the largest effects on photosynthetic processes, which were manifested in elevated CO2 assimilation capacities, induction of stomata opening and transpiration, and also in the decreased ratio in the conversion of absorbed light energy to photochemistry in PS II, as demonstrated by the low Y(II) value.…”

The Effect of Noni Leaves’ Age Variation On the Value of Absorbance and Wavelength In Certain Color Spectrums

“…However, the yellow sample had poor result in that the absorption ranges between 0,5 to 1,0 A in the wavelength ranges between 650 to 690 nm. According to [11] [12] the light spectrum has an important role in the process of photosynthesis as in this process, chlorophyll will transmit several specific colors of light, they are the color of blue light with the wavelength ranging from 450 up to 475 nm and the color of red light ranging from 630 to 675 nm. The more light absorbed, the higher the energy for photosynthesis.…”

“…the color of blue light with the wavelength ranging from 450 to 475 nm and the color of red light ranging from 630 to 675 nm. The more light absorbed, the higher the energy for photosynthesis [11] [12].…”