Navigation Links
Artificial light quality affects herbivore preference for seedlings
Date:6/22/2011

OSAKA, JAPANIn horticultural production, growers often depend on systems that use artificial light to produce high-quality transplants. Although the systems are efficient, fluorescent lamps can produce plants with shorter shoots than those grown under natural light. Studies have indicated that this reduced shoot elongation is due to the high red:far red ratio of typical commercial fluorescent lamps, which emit little far red irradiation.

In natural environments a reduction in the red:far red (R:FR) ratio resulting from the absorption of red light by neighboring vegetation increases shoot elongation and leaf expansion and reduces leaf thickness and chlorophyll content. This morphologic response, called "shade avoidance", reduces plant resistance to herbivores. Observing this phenomenon, scientists questioned whether illumination by fluorescent lamps with higher-than-natural R:FR ratio could lessen plants' attractiveness to herbivores, thus reducing the need for pesticides at transplant.

Researchers in Japan tested the hypothesis with experiments that evaluated the preference of adult sweetpotato whitefly to cucumber seedlings grown under commercial fluorescent lamps or under metal-halide lamps that provided a spectrum similar to that of natural light. The results were published in HortTechnology.

Cucumber seedlings (Cucumis sativus) were grown under fluorescent lamps (FL) or under metal-halide lamps (ML) in a 12/12-hour light/dark cycle. The red:far red (R:FR) ratio of FL was 7.0 and that of ML was 1.2. Pairs of cucumber seedlings, one grown under FLs and the other under MLs, were then placed in cages and about 100 sweetpotato whitefly adults (Bemisia tabaci biotype B) were released. "There were significantly fewer whitefly adults on the cucumber seedlings grown under fluorescent lamps (36%) than on those grown under metal-halide lamps (64%) 24 hours after release", reported corresponding author Toshio Shibuya. "Additionally, FL cucumber seedlings had higher chlorophyll content and thicker leaves than ML seedlings."

"From these results, we concluded that the lower attractiveness of FL cucumber seedlings to adult sweetpotato whiteflies was probably due to changes in leaf morphologic characteristics resulting from high R:FR light of FL. The plants with lower attractiveness are possibly more resistant to herbivores", said Shibuya.

The scientists noted that growers must consider the interaction of other environmental factors such as air moisture in order to apply the results to horticultural production. They added that experiments designed to measure adult sweetpotato whitefly landing response in a no-choice situation would be necessary to further evaluate the light technology.

"The fact that light quality affects the plant attractiveness to herbivores should be considered in selecting light sources for transplant production under artificial light", concluded the researchers.


'/>"/>

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

Related medicine news :

1. Washington University surgeons successfully use artificial lung in toddler
2. 2-year results: Artificial disc a viable alternative to fusion for 2-level disc disease
3. Artificial tissue promotes skin growth in wounds
4. Latest Artificial Pancreas Trials Reduce Risk of Low Blood Sugar
5. University of Granada researchers make the first bioartificial organ in Spain
6. For back, neck pain, artificial disc replacement has cost, outcome advantages over fusion surgery
7. Biological joints could replace artificial joints soon
8. Artificial Turf Helps Football Players With Agility Drills
9. How football playing robots have the future of artificial intelligence at their feet
10. VCU Medical Center leads study of first US portable driver for powering the total artificial heart
11. World Renowned Total Artificial Heart Pioneer Dr. Jack Copeland Joins Faculty at UC San Diego
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/24/2017)... ... February 24, 2017 , ... WHAT: ... networking and recognition opportunities as well as advocacy for the state and region‘s ... on February 23. The Council's Innovation Forecast event highlights innovation throughout the ...
(Date:2/24/2017)... ... , ... With millions of Americans and people worldwide struggling ... are aware of our options and are empowered with strength and information throughout ... its newest edition of "Vision and Hearing" in USA Today, that will educate ...
(Date:2/24/2017)... , ... February 24, 2017 , ... Yisrayl Hawkins, Pastor ... on Bible Prophecy concerning this present generation. Yisrayl makes an astounding statement when ... generation. He explains that the Bible details the current times so plainly that ...
(Date:2/24/2017)... ... February 24, 2017 , ... Congratulations to ... Elite division on February 12th. Ms. Esparza qualified into this prestigious status ... competition held in Las Vegas, Nevada. Frida is one of approximately 25 gymnasts ...
(Date:2/23/2017)... ... February 23, 2017 , ... ... to funding innovative lymphoma research and serving the lymphoma community through a comprehensive ... the La Gorce Country Club in Miami Beach to host its Swirl: Miami ...
Breaking Medicine News(10 mins):
(Date:2/24/2017)... YORK , Feb. 23, 2017  The ... 330.6 million by 2021 from USD 275.9 million ... Read the full report: http://www.reportlinker.com/p04718602-summary/view-report.html ... increasing spending on pharmaceutical R&D, and growth in ... driving the market growth for particle counters. On ...
(Date:2/23/2017)... , Feb 23, 2017 Research and Markets ... Price Analysis and Strategies - 2016" report to their offering. ... The latest ... provides drug pricing data and benchmarks in the global Autism Spectrum ... What are the key drugs marketed for Autism ...
(Date:2/23/2017)... CITY, Calif., Feb. 23, 2017 Nevro Corp. (NYSE: ... evidence-based solutions for the treatment of chronic pain, today reported ... December 31, 2016. 2016 Accomplishment & Highlights: ... full year 2016, an increase of 228% as reported, over ... for 2016, an increase of 612% over the prior year ...
Breaking Medicine Technology: