Document Detail

Dose dependent effects of gamma radiation on lettuce (Lactuca sativa var. capitata) seedlings.
MedLine Citation:
PMID:  23020834     Owner:  NLM     Status:  Publisher    
Abstract Purpose: The objectives of this study are to determine the effects of gamma radiation on lettuce growth and development, as well as on the content of photosynthetic pigments in 28 days lettuce leaf. Materials and methods: Lettuce dry seeds were exposed to a (60)Co [Cobalt-60] gamma source at doses ranging from 2Gy [Gray] to 70 Gy. The photosynthetic pigment content was determined spectrophotometrically. Results: Our results show that an irradiation dose between of 2-30 Gy enhanced the growth parameters (final germination percentage, germination index, root and hypocotyl length) as compared to untreated plants. Seed germination test revealed that 30 Gy irradiation dose induced the highest increase of growth parameters, while at 70 Gy it was recorded a significant decrease of plant vegetative growth. The results indicate that exposing the seeds at doses ranging from 2 Gy to 30 Gy enhanced the photosynthetic pigments (chlorophyll a, chlorophyll b, carotenoids) content, while at higher doses (70 Gy) ) it was noticed the decrease of the assimilatory pigments. Conclusion: Present results suggested that seed treatment with gamma radiations (0-30 Gy) was effective in stimulating plant growth and development, as well as the content of assimilatory pigments. At a higher dose of 70 Gy, there was a drastic reduction in the length of shoots and roots and also in the total chlorophyll content. These observations confirm that ionizing radiation stimulates physiological parameters up to a certain low doses, and then it inhibits these parameters at higher doses.
Marcu Delia; Cristea Victoria; Daraban Liviu
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-1
Journal Detail:
Title:  International journal of radiation biology     Volume:  -     ISSN:  1362-3095     ISO Abbreviation:  Int. J. Radiat. Biol.     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-1     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8809243     Medline TA:  Int J Radiat Biol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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