fulltext.study @t Gmail

Preillumination of lettuce seedlings with red light enhances the resistance of photosynthetic apparatus to UV-A

Paper ID Volume ID Publish Year Pages File Format Full-Text
29442 44405 2013 6 PDF Available
Title
Preillumination of lettuce seedlings with red light enhances the resistance of photosynthetic apparatus to UV-A
Abstract

Seedlings of 10-day-old lettuce (Lactuca sativa L., cultivar Berlin) were preilluminated by low intensity red light (λmax = 660 nm, 10 min, 5 μmol quanta m−2 s−1) and far-red light (λmax = 730 nm, 10 min, 5 μmol quanta m−2 s−1) to study the effect of pre-treatment on photosynthesis, photochemical activity of photosystem II (PSII), the contents of photosynthetic and UV-A-absorbing pigments (UAPs) and H2O2, as well as total and ascorbate peroxidase activities in cotyledonary leaves of seedlings exposed to UV-A. UV radiation reduced the photosynthetic rate (Pn), the activity of PSII, and the contents of Chl a and b, carotenoids and UAPs in the leaves, but increased the content of H2O2 and the total peroxidase activity. Preillumination with red light removed these effects of UV. In turn, the illumination with red light, then far-red light removed the effect of the red light. Illumination with red light alone increased the content of UAPs, as well as peroxidase activity. It is suggested that higher resistance of the lettuce photosynthetic apparatus to UV-A radiation is associated with involvement of the active form of phytochrome B, thereby increasing peroxidase activities as well as UAPs and saving preservation of photosynthetic pigment contents due to pre-illumination with red light.

► We reported combined effects of red light (RL) and UV-A on photosynthetic apparatus (PA). ► Red light enhances resistance of photosynthetic apparatus to UV-A. ► Red light increases the content of UV-absorbing pigments and peroxidase activity. ► Preillumination with red light decreases the level of H2O2 induced with UV-A.

Keywords
Lactuca sativa L.; Peroxidase activity; Stress-resistance; Photosynthetic apparatus; Phytochrome; UV-A radiation
First Page Preview
Preillumination of lettuce seedlings with red light enhances the resistance of photosynthetic apparatus to UV-A
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
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology B: Biology - Volume 122, 5 May 2013, Pages 1–6
Authors
, , , , , , , ,
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