Effect of ultraviolet-B radiation on growth, photosynthetic pigments, and cell biology of Kappaphycus alvarezii (Rhodophyta, Gigartinales) macroalgae brown strain

2010 ◽  
Vol 48 (2) ◽  
pp. 161-172 ◽  
Author(s):  
E. C. Schmidt ◽  
B. G. Nunes ◽  
M. Maraschin ◽  
Z. L. Bouzon
Keyword(s):  
Photosynthetic Pigments ◽  
Cell Biology ◽  
Kappaphycus Alvarezii ◽  
Ultraviolet B ◽  
Ultraviolet B Radiation

Paclobutrazol enhances tolerance to increased levels of UV-B radiation in soybean (Glycine max) seedlings

1995 ◽  
Vol 73 (6) ◽  
pp. 797-806 ◽  
Author(s):  
Trevor E. Kraus ◽  
R. Austin Fletcher ◽  
Rodger C. Evans ◽  
K. Peter Pauls
Keyword(s):  
Protein Synthesis ◽  
Glycine Max ◽  
Photosynthetic Pigments ◽  
Photosynthetic Efficiency ◽  
Ultraviolet B ◽  
Ultraviolet B Radiation ◽  
Glycine Max L ◽  
Flavonoid Composition ◽  
Radiation Treatments ◽  
Sem Analyses

Paclobutrazol increased the tolerance of soybean (Glycine max L. cv. AC Bravor) seedlings to elevated levels of ultraviolet-B radiation (UV-B: 280 – 320 nm). Within 3 days of exposure to elevated UV-B, nontreated seedlings were photosynthetically less efficient, and by the end of the 11th day of treatment their leaf areas and fresh masses were, respectively, 55 and 44% smaller than their counterparts not irradiated with UV-B. In contrast, paclobutrazol-treated seedlings maintained full photosynthetic efficiency throughout the duration of UV-B irradiation, and their leaf areas and fresh masses were only reduced by 30 and 22%, respectively. No changes in flavonoid composition occurred as a result of the paclobutrazol or UV-B radiation treatments, but UV-B tended to increase the quantities of photosynthetic pigments. The leaves from paclobutrazol-treated seedlings were significantly thicker than those of nontreated seedlings, and SEM analyses showed that the treated seedlings had much denser epicuticular wax layers than the controls. No significant changes in protein expression occurred during exposure to elevated UV-B and (or) paclobutrazol. Further studies with paclobutrazol-treated plants may lead to a better understanding of one or more of the mechanisms employed by plants to tolerate elevated levels of UV-B. Key words: leaf fluorescence, paclobutrazol, pigments, protein synthesis, SEM, UV-B radiation.

scholarly journals Effects of Ultraviolet-B Radiation on the Photosynthetic Pigments and Protein Content of Strawberry

2019 ◽  
pp. 1-7
Author(s):  
Justin Masih
Keyword(s):  
Protein Content ◽  
Chlorophyll A ◽  
Photosynthetic Pigments ◽  
Ultraviolet B ◽  
Chlorophyll B ◽  
Ultraviolet B Radiation ◽  
Negative Effect ◽  
The Impact

The effects of ultraviolet-B (UV-B) radiations were studied on strawberry. The transplanted plants were irradiated with UV-B (280-320 nm) for 30, 60, 90 and 120 minutes on 20th, 40th, and 60th days after transferring. The enhanced UV-B radiation caused a negative effect on photosynthetic pigments and protein content of strawberry. Distinct decreased as a result of UV-B irradiation in contents of chlorophyll a, chlorophyll b, carotenoids and protein content was observed in strawberry. The impact of increase of duration of UV-B irradiation was also observed and found to be directly proportional.

Activation of HIV in Human Skin by Ultraviolet B Radiation and its Inhibition by NFκB Blocking Agents¶

2001 ◽  
Vol 74 (6) ◽  
pp. 805 ◽  
Author(s):  
Joan Breuer-McHam ◽  
Eric Simpson ◽  
Irene Dougherty ◽  
Makoto Bonkobara ◽  
Kiyoshi Ariizumi ◽  
...  
Keyword(s):  
Human Skin ◽  
Ultraviolet B ◽  
Ultraviolet B Radiation ◽  
Blocking Agents

Ancestral U.S. Soybean Cultivars Characterized for Tolerance to Ultraviolet‐B Radiation

Crop Science ◽  
1992 ◽  
Vol 32 (5) ◽  
pp. 1214-1219 ◽  
Author(s):  
Herbert E. Reed ◽  
Alan H. Teramura ◽  
William J. Kenworthy
Keyword(s):  
Ultraviolet B ◽  
Ultraviolet B Radiation ◽  
Soybean Cultivars
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