Mitochondria: Increase in Oxidative Capacity and Quantitative Recovery after Massive Doses of Ionizing Radiation

Romani, Roger J.; Ku, Lily Lim; Fisher, L.K.; Kooy, J. G. van

doi:10.2307/3572194

Cited by 17 publications

(4 citation statements)

References 6 publications

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“…Irradiation resulted in stimulation of respiration rate of apples, and generally tissues from more mature fruit were less sensitive to irradiation 8. 9 Romani et al 10 observed a divergent respiratory response of ‘Bartlett’ pears to irradiation dose, with higher levels of irradiation (6–10 kGy) resulting in a reduced respiratory activity compared with that of control fruits or those irradiated at lower levels (2–2.5 kGy).…”

Section: Introductionmentioning

confidence: 99%

Effects of irradiation on respiration and ethylene production of apple slices

Güneş¹,

Watkins²,

Hotchkiss³

2000

J. Sci. Food Agric.

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Respiration and ethylene production rates of irradiated apple slices from four apple cultivars were measured for 72 h. Doses less than 1.2 kGy had no effect on rates of CO 2 production and O 2 consumption, and irradiation at doses between 1.2 and 2.4 kGy had minimal effect for all cultivars. Respiratory response of `Idared', `Law Rome' and `Empire' slices to irradiation was curvilinear, with maximum respiration occurring in the 3±6 kGy dose range. Response of `Delicious' slices was linear over the irradiation dose range (0±11 kGy) studied. Respiratory quotient increased with irradiation dose. The degree of maturity of the slices affected respiratory responses. Irradiation reduced ethylene production of all slices. These results suggest that irradiation doses of up to 2.4 kGy can be used with minimum effect on the respiratory physiology of tissues.

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Section: Introductionmentioning

confidence: 99%

Effects of irradiation on respiration and ethylene production of apple slices

Güneş¹,

Watkins²,

Hotchkiss³

2000

J. Sci. Food Agric.

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“…In irradiated cells, a slight increase in both oxygen uptakes was observed during the first four days. This transient stimulation could be an after-effect of irradiation, as observed on isolated mitochondria from gamma-irradiated fruit [22], or perhaps linked to the respiration of accumulated sucrose (see Fig. 2).…”

Section: Resultsmentioning

confidence: 99%

Cell division arrest by gamma-irradiation in photoautotrophic suspension culture of Euphorbia characias: Maintenance of photosynthetic capacity and overaccumulation of sucrose

Chagvardieff

Dimon

Carrier

et al. 1989

Plant Cell Tiss Organ Cult

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applied to photoautotrophic cell suspensions of Euphorbia characias L. in the exponential growth phase led to the arrest of cell division and to a subsequent overaccumulation of sucrose and dry matter. From the fourth day of culture, the chlorophyll content and gross photosynthesis were not depressed by gamma-treatment nor by sugar accumulation. In both cultures, no difference was observed between oxygen uptake in the light at CO, saturating concentration and in the dark, suggesting that no change in energy-dissipative reactions took place after irradiation. A slight increase in oxygen uptake in both light and dark was observed in irradiated cells during the first four days. However, in the absence of limiting factors, the photosynthetic capacities of the dividing and irradiated non-dividing photoautotrophic cells were identical but higher than that of the non-dividing cells in the stationary growth phase. This suggests that gamma-irradiation arrests cell division by a mechanism different to that occuring in stationary-phase cultures. This may be of value in investigating the metabolism of secondary products.

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“…Preliminary reports of this work have appeared elsewhere (30,35 (32). The impact of increased senescence on the mitochondrial yield is illustrated in figure 2.…”

mentioning

confidence: 98%

“…We have previously shown that massive, in vivo irradiation of preclimacteric pear2 fruits results in a loss and subsequent recovery of mitochondrial protein and an actual enhancement of mitochondrial activity (32). Similarly irradiated fruit cells also exhibit a suppression and recovery in the capacity to incorporate amino acids into mitochondrial protein (29).…”

mentioning

confidence: 99%

Cellular Senescence, Radiation Damage to Mitochondria, and the Compensatory Response in Ripening Pear Fruits

Romani¹,

Yu²,

Ku³

et al. 1968

Plant Physiol.

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It is generally accepted that the climacteric phase of ripening fruits is well suited for the study of cellular senescence (1). Since a surge in respiratory activity is the dominant, readily measurable phenomenon, mitochondria are implicated as the sites of causal events. This view was embodied in the early work of Millerd et al. (19) with the resulting postulate that uncoupling of oxidative phosphorylation permitted an increased respiratory rate. Along similar lines, Hulme (7) and Pearson and Robertson (21) attributed the rise in respiration to the availability of phosphate acceptor (ADP) resulting from increased protein synthesis and accelerated demands for energy. However, with specific reference to mitochondrial protein, data on the yield of particulate protein (27) and on the incorporation of amino acids into mitochondrial protein (28) indicate a decline in synthetic activities as fruit reach the climacteric peak.Richmond and Biale (23), Sacher (37), and especially Young and Biale (44) have questioned the prevalence of "uncoupling" or "ADP control" in ripening fruit cells. Moreover, the work of Lance et al. (10), Hulme et al. (8,9) and the experiments reported below, reveal that mitochondria remain functionally sound and "cotipled" throughout the climacteric phase.

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Mitochondria: Increase in Oxidative Capacity and Quantitative Recovery after Massive Doses of Ionizing Radiation

Cited by 17 publications

References 6 publications

Effects of irradiation on respiration and ethylene production of apple slices

Effects of irradiation on respiration and ethylene production of apple slices

Cell division arrest by gamma-irradiation in photoautotrophic suspension culture of Euphorbia characias: Maintenance of photosynthetic capacity and overaccumulation of sucrose

Cellular Senescence, Radiation Damage to Mitochondria, and the Compensatory Response in Ripening Pear Fruits

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