Document Detail


Effect of gamma and UV-B/C radiation on plant cells.
MedLine Citation:
PMID:  11567888     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The biological effect of gamma-rays is based on the interaction with atoms or molecules in the cell, particularly water, to produce free radicals, which can damage different important compounds of plant cell. The UV-B/C photons have enough energy to destroy chemical bounds, causing a photochemical reaction. The biological effect is due to these processes. This paper is focused on the structural and biochemical changes of the cell wall and plastids after gamma and/or UV-B irradiation. Gamma-rays accelerate the softening of fruits, causing the breakdown of middle lamella in cell wall. They also influence the plastid development and function, such as starch-sugar interconversion. The penetration of UV-B light into the cell is limited, while gamma-rays penetrate through the cells. For this reason, UV-B light has a strong effect on surface or near-to-surface area in plant cells. UV-B radiation influences plastid structure (mostly thylakoid membranes) and photosynthesis. Some kinds of pigments, such as carotenoids, flavonoids save plant cells against UV-B and gamma irradiation. Plant cells are generally ozone sensitive. The detoxifying systems operate at the cellular level. Methods for studying structural changes in plant cells develop in direction to molecular biology, combined with immunoassays and new microscopical techniques. Nowadays, UV-B radiation is undergoing much research, being an environmental factor which causes damage to both humans and plant cells.
Authors:
E Kovács; A Keresztes
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Publication Detail:
Type:  Journal Article; Review    
Journal Detail:
Title:  Micron (Oxford, England : 1993)     Volume:  33     ISSN:  0968-4328     ISO Abbreviation:  Micron     Publication Date:  2002  
Date Detail:
Created Date:  2001-09-24     Completed Date:  2002-01-22     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  9312850     Medline TA:  Micron     Country:  England    
Other Details:
Languages:  eng     Pagination:  199-210     Citation Subset:  IM    
Affiliation:
Central Food Research Institute, Department of Microbiology and Post-harvest Physiology, Budapest, Hungary. h9746kov@ella.hu
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MeSH Terms
Descriptor/Qualifier:
Cell Wall / physiology,  radiation effects,  ultrastructure
Chloroplasts / physiology,  radiation effects
Gamma Rays*
Microscopy, Electron
Mitochondria / physiology,  radiation effects
Photosynthesis / radiation effects
Pigments, Biological / metabolism
Plant Physiological Phenomena / radiation effects*
Plants / cytology,  metabolism,  radiation effects*,  ultrastructure
Ultraviolet Rays*
Chemical
Reg. No./Substance:
0/Pigments, Biological

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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