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Near-UV radiation acts as a beneficial factor for physiological responses in cucumber plants

Paper ID Volume ID Publish Year Pages File Format Full-Text
30468 44480 2013 6 PDF Available
Title
Near-UV radiation acts as a beneficial factor for physiological responses in cucumber plants
Abstract

•We examined the effects of near-UV radiation (300∼400 nm; wavelength) on cucumber plants.•The plants were grown under the conditions between visible lights with and without near-UV radiation.•Only visible lights without near-UV radiation suppressed the growth of the plants.•Near-UV radiation resulted in enhancement of photosynthetic, respiratory and metabolic activities.•Namely, near-UV radiation acts as a beneficial factor for physiological responses in the plants.

Effects of near-UV radiation on the growth and physiological activity of cucumber plants were investigated morphologically, physiologically and biochemically using 3-week-old seedlings grown under polyvinyl chloride films featuring transmission either above 290 nm or above 400 nm in growth chambers. The hypocotyl length and leaf area of cucumber seedlings were reduced but the thickness of leaves was enhanced by near-UV radiation, due to increased upper/lower epidermis thickness, palisade parenchyma thickness and volume of palisade parenchyma cells. Photosynthetic and respiratory activities were also promoted by near-UV radiation, associated with general enhancement of physiological/biochemical responses. Particularly, metabolic activities in the photosynthetic system of chloroplasts and the respiratory system of mitochondria were analyzed under the conditions of visible light with and without near-UV radiation. For example, the activities of NAD(P)-dependent enzymes such as glyceraldehyde-3-phosphate dehydrogenase (G3PDH) in chloroplasts and isocitrate dehydrogenase (ICDH) in mitochondria were elevated, along with levels of pyridine nucleotides (nicotinamide coenzymes) [NAD(H) and NADP(H)] and activity of NAD kinase (NADP forming enzyme). Taken together, these data suggest that promotion of cucumber plant growth by near-UV radiation involves activation of carbon and nitrogen metabolism in plants. The findings of this research showed that near-UV radiation reaching the Earth’s surface is a beneficial factor for plant growth.

Keywords
Cell volume; Cucumis sativus; Leaf thickness; Near-UV radiation; Photosynthesis; Pyridine nucleotides [nicotinamide coenzymes: NAD(H), NADP(H)]
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Near-UV radiation acts as a beneficial factor for physiological responses in cucumber plants
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology B: Biology - Volume 128, 5 November 2013, Pages 64–69
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us