Navigation Links
Researchers test effects of LEDs on leaf lettuce
Date:11/19/2013

CHEONGJU, SOUTH KOREA--In the life cycle of plants, most developmental processes are dependent on light. Significant biological processes such as germination, shade avoidance, circadian rhythms, and flower induction are all affected by light. Recent advancements in the use of LED lighting in plant and vegetable production systems has researchers looking for insights into the effects of these artificial lights on the growth and yield of crops. Scientists from the Department of Horticultural Science at Chungbuk National University published a study in HortScience that sheds some light on the advantages and challenges of LEDs in lettuce cultivation.

The increased use of LEDs in environmentally controlled closed-type plant production systems allows crop production throughout the year, regardless of external weather conditions. According to authors Ki-Ho Son and Myung-Min Oh, LEDs have some advantages over traditional lighting sources in plant cultivation. "LEDs have the advantages of high light-conversion efficiency with low radiant heat output, semipermanence, and small mass," they noted. "In addition, LEDs are available in a variety of narrow wavebands; hence, it is possible to optimize light quality to improve both crop yield and quality." They explained that blue and red LEDs are usually used for plant growth because chlorophyll a and b efficiently absorb wavelengths in the blue and red ranges.

The research design used red and green leaf lettuce subjected to six LED lighting treatments. The scientists examined growth characteristics including the fresh and dry weights of shoots and roots, shoot-to-root ratio, total leaf area, and chlorophyll content. Chlorophyll fluorescence, antioxidant capacity, phenolic concentration, and flavonoid concentration were also measured in the study. "The growth characteristic results for the two lettuce cultivars grown under various ratios of blue to red LEDs confirmed that red LED serves as a major light source that improves lettuce growth rate," the authors said.

The experiments confirmed that both blue and red LEDs have a positive effect on the accumulation of antioxidant phenolic compounds and lettuce growth, respectively. "Red light irradiation in the absence of blue light was effective at stimulating the biomass accumulation of lettuce plants; however, this lighting alone induced abnormal leaf shape and had a negative effect on polyphenolics and antioxidant levels," the scientists said. They recommended a mixture of blue and red LEDs to enhance lettuce crop quality and yield in closed-type plant production systems.


'/>"/>

Contact: Michael W. Neff
mwneff@ashs.org
703-836-4606
American Society for Horticultural Science
Source:Eurekalert

Related biology news :

1. Study by UC Santa Barbara researchers suggests that bacteria communicate by touch
2. UC Santa Barbara researchers discover genetic link between visual pathways of hydras and humans
3. Researchers attempt to solve problems of antibiotic resistance and bee deaths in one
4. UNH researchers find African farmers need better climate change data to improve farming practices
5. Ottawa researchers to lead world-first clinical trial of stem cell therapy for septic shock
6. Researchers uncover molecular pathway through which common yeast becomes fungal pathogen
7. Researchers print live cells with a standard inkjet printer
8. Columbia Engineering and Penn researchers increase speed of single-molecule measurements
9. Researchers reveal how a single gene mutation leads to uncontrolled obesity
10. Researchers discover novel therapy for Crohns disease
11. New paper by Notre Dame researchers describes method for cleaning up nuclear waste
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:12/22/2016)...  As part of its longstanding mission to improve genetic ... recently released its latest children,s book, titled The ... the topics of inheritance and variation of traits that are ... elementary school classrooms in the US. The ... Ariana Killoran , whose previous book with 23andMe, ...
(Date:12/20/2016)... The rising popularity of mobility services ... stoking significant interest in keyless access systems. Following ... energy (BLE), biometrics and near-field communication (NFC) are ... wireless technologies in the automotive industry. This evolution ... systems opens the market to specialist companies such ...
(Date:12/19/2016)... y TORONTO , 19 de diciembre de 2016 ... Inc. que permitirá el desarrollo acelerado de MSC-1, un anticuerpo humanizado ... tipos de tumor en 2017, con múltiples sitios previstos a lo ... ... objetivo en el factor inhibidor de leucemia (LIF), una citoquina pleiotrópica ...
Breaking Biology News(10 mins):
(Date:1/16/2017)... MANHASSET, N.Y. , Jan. 16, 2017   ... Kevin J. Tracey, MD , president and CEO of ... Northwell Health, completed an analysis of how the nervous ... further identify and develop bioelectronic medicine devices ... today in Nature Neuroscience . The ...
(Date:1/16/2017)... , Jan. 16, 2017  Eurofins Genomics today ... will allow more customers to receive their primers in ... or compromise in quality found with other providers. Express ... United States at no additional fee. ... routine genetic studies, including DNA sequencing, genotyping, site-directed mutagenesis, ...
(Date:1/14/2017)... , Jan. 13, 2017  The Alliance for Safe ... response to FDA final guidance on biologic ... continued leadership in emphasizing the importance of distinct naming ... aware of the benefits biosimilars will bring to patients, ... Yet the portion of the Guidance dealing with ...
(Date:1/13/2017)... , Jan 13, 2017 Research and Markets has ... to their offering. ... global biopolymers market to grow at a CAGR of 16.83% during the ... the growth prospects of the global biopolymers market for 2017-2021. To calculate ... of sales of biopolymer products. The report also includes a a discussion ...
Breaking Biology Technology: