Effects of gamma irradiation on Holcus lanatus (Yorkshire fog grass) and associated soil microorganisms

Jones, Helen; West, Helen; Chamberlain, Paul; Parekh, Nisha R.; Beresford, N.A.; Crout, N.M.J.

doi:10.1016/j.jenvrad.2004.01.027

Cited by 36 publications

(16 citation statements)

References 47 publications

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“…However, there was an exception for plantlets derived from 10 and 20 Gy irradiated seeds which exhibited relatively low total soluble nitrogen content as compared to the control samples. This was similar to the findings of Jones et al (2004) who discovered a lower content of nitrogen in the shoots of Holcus lanatus that were exposed to 0, 5, and 10 Gy than in plants irradiated with 20 Gy and above. This may suggest a dilution effect resulting from uninhibited growth at the lower doses (Jones et al, 2004).…”

Section: Total Soluble Nitrogen Contentsupporting

confidence: 90%

“…This was similar to the findings of Jones et al (2004) who discovered a lower content of nitrogen in the shoots of Holcus lanatus that were exposed to 0, 5, and 10 Gy than in plants irradiated with 20 Gy and above. This may suggest a dilution effect resulting from uninhibited growth at the lower doses (Jones et al, 2004). A literature search showed that there is no research evidence available regarding the effect of ion beam irradiation on the total soluble nitrogen content in plant systems.…”

Section: Total Soluble Nitrogen Contentsupporting

confidence: 90%

“…Similar results were reported by Masuda et al (2009) who noticed a reduction in radical elongation as a result of irradiation of tomato seeds by carbon and helium ions. The negative impact of radiation on plants may be indirectly mediated via metabolic changes through free radical formation, as well as indirectly, by DNA damage to the dividing cells (Jones et al, 2004). According to Vazquez-Tello et al (2005), cell division is the most sensitive parameter to irradiation, which might account for the growth inhibition observed in irradiated plantlets.…”

Section: Height Of Plantletsmentioning

confidence: 99%

“…Increased nitrogen and phosphorus contents as a result of irradiation were also observed in cabbage, onion, and carrot (Rennie and Nelson, 1975). According to Jones et al (2004), high doses of irradiation sufficiently damaged the plants, leading to a reduced rate of nitrogen metabolism and mobilization relative to healthy tissues, thereby causing apparently greater and more constant nitrogen content. On the other hand, Bajaj (1970) suggested that the increase in total soluble nitrogen could be due to the quantitative changes in non-protein nitrogen or the accumulation of catabolic tissue products.…”

Section: Total Soluble Nitrogen Contentmentioning

confidence: 99%

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Morphological and biochemical responses of Oryza sativa L. (cultivar MR219) to ion beam irradiation

Ling

Ung

Hussein

et al. 2013

J. Zhejiang Univ. Sci. B

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Abstract:Objective: Heavy ion beam, which has emerged as a new mutagen in the mutation breeding of crops and ornamental plants, is expected to result in the induction of novel mutations. This study investigates the morphological and biochemical responses of Oryza sativa toward different doses of carbon ion beam irradiation. Methods: In this study, the dry seeds of O. sativa were irradiated at 0, 20, 40, 60, 80, 100, and 120 Gy, followed by in-vitro germination under controlled conditions. Morphological and biochemical studies were conducted to investigate the morphological and physiological responses of O. sativa towards ion beam irradiation. Results: The study demonstrated that low doses (10 Gy) of ion beam have a stimulating effect on the height, root length, and fresh weight of the plantlets but not on the number of leaves. Meanwhile, doses higher than 10 Gy caused reductions in all the morphological parameters studied as compared to the control samples. The highest total soluble protein content [(2.11±0.47) mg/g FW] was observed in plantlets irradiated at 20 Gy. All irradiated plantlets were found to have 0.85% to 58.32% higher specific activity of peroxidase as compared to the control samples. The present study also revealed that low doses of ion beam (10 and 20 Gy) had negligible effect on the total chlorophyll content of O. sativa plantlets while 40 Gy had a stimulating effect on the chlorophyll content. Plantlets irradiated between 40 to 120 Gy were shown to be 0.38% to 9.98% higher in total soluble nitrogen content which, however, was not significantly different from the control samples. Conclusions: Carbon ion beam irradiation administered at low to moderate doses of 10 to 40 Gy may induce O. sativa mutants with superior characteristics.

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Section: Total Soluble Nitrogen Contentsupporting

confidence: 90%

Section: Total Soluble Nitrogen Contentsupporting

confidence: 90%

Section: Height Of Plantletsmentioning

confidence: 99%

Section: Total Soluble Nitrogen Contentmentioning

confidence: 99%

See 2 more Smart Citations

Morphological and biochemical responses of Oryza sativa L. (cultivar MR219) to ion beam irradiation

Ling

Ung

Hussein

et al. 2013

J. Zhejiang Univ. Sci. B

View full text Add to dashboard Cite

show abstract

“…Mycorrhizal fungi can affect the uptake of radionuclides by plants (Vinichuk et al, 2013), but the impact of IR on the diversity and function of the fungi themselves is poorly studied, despite their ecological importance. The extent of colonization of plant roots by arbuscular mycorrhizal fungi can be reduced in response to radioactivity (Jones et al, 2004, Kothamasi et al, 2016. Radiation exposure also affects other soil microorganisms with key roles in ecosystem functioning: the sensitivity of ammonia oxidizing bacteria to gamma radiation appears to be associated with the lack of re-establishment of trees in contaminated soils (Shah et al, 2013).…”

Section: Ecosystem Processes and The Effects Of Ir On Microorganismsmentioning

confidence: 99%

An Extended Dose–Response Model for Microbial Responses to Ionizing Radiation

Siasou

Johnson

Willey

2017

Front. Environ. Sci.

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Oily waste containing natural radionuclides: does it cause stimulation or inhibition of soil bacterial community?

Galitskaya

Gumerova

Ratering

et al. 2015

J. Plant Nutr. Soil Sci.

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Contamination with oily wastes containing natural radionuclides is a potential hazard for soil health and function. Our study aimed to reveal both structural and functional changes of the microbial community resistant to and able to decompose oily wastes in soil. To do this, we determined CO 2 efflux, microbial biomass (by the extraction-fumigation method), and community structure (by PCR-SSCP) for 120 d after application of radioactive oily wastes to the soil at the ratio 1:4. The addition of the waste resulted in an increase of the activity concentration of 226 Ra by 130 times (up to 643 Bq kg -1 ) and of 232 Th by 29 times (up to 254 Bq kg -1 ). The calculated weighted dose for the radionuclide 226 Ra was found to be below the values that are known to affect microorganisms. However, the cumulative effect of a repeated deposition of radioactive oily waste may result in an increase of the weighted dose up to an effective level. During the incubation, the hydrocarbon (HC) content of the waste-treated soil decreased from 156 to 54 g kg -1 of soil indicating intensive decomposition of added organics by soil microorganisms. The waste application, however, led to an inhibition of soil microbial biomass compared with the control (by 26-47%). Microbial respiration was stimulated in the first month of incubation and then decreased until the end of the incubation period (by up to 74% compared to the control). The qCO 2 was estimated to be 3-fold higher than the control on day 1 of incubation and equal to the control on day 120 of incubation. The bacterial diversity decreased in the contaminated soil compared with the control soil. The bacterial community structure was altered by domination of new oil degrader species belonging to the genera Dyella, Pseudoxanthomonas, Sinobacter, and Parvibaculum. Thus, disposal of radioactive petroleum waste strongly altered the structure of the microbial community resulting in the selection of resistant species able to decompose pollutants and also affected the community function (inhibition of microbial biomass and stimulation of respiration) which tended to stabilize after long-term incubation.

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Effects of gamma irradiation on Holcus lanatus (Yorkshire fog grass) and associated soil microorganisms

Cited by 36 publications

References 47 publications

Morphological and biochemical responses of Oryza sativa L. (cultivar MR219) to ion beam irradiation

Morphological and biochemical responses of Oryza sativa L. (cultivar MR219) to ion beam irradiation

An Extended Dose–Response Model for Microbial Responses to Ionizing Radiation

Oily waste containing natural radionuclides: does it cause stimulation or inhibition of soil bacterial community?

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