Inhibitory Effects of Inorganic Compounds on Photosynthesis in Chlorella

Greenfield, Sydney S.

doi:10.2307/2437439

Cited by 44 publications

(19 citation statements)

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“…Contrary to the results obtained here (see the comparison in the preceding section) GREENFIELD (5) found that CuSO4 primarily inhibits a dark reaction in the photosynthesis of Chlorella. It is therefore suggested that Greenfield's dark reaction is not involved in the dye-reducing mechanism of isolated chloroplasts but is concerned with the utilization of carbon dioxide in photosynthesis.…”

contrasting

confidence: 99%

The Effects of Some Inhibitors of Photosynthesis Upon the Photochemical Reduction of a Dye by Isolated Chloroplasts

Macdowall

1949

Plant Physiol.

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contrasting

confidence: 99%

The Effects of Some Inhibitors of Photosynthesis Upon the Photochemical Reduction of a Dye by Isolated Chloroplasts

Macdowall

1949

Plant Physiol.

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“…An application of 0.8 fiM copper sulphate, which has no effect on respiration, showed a distinct inhibition in the rate of photosynthesis, and a marked effect was observed in 8 fiM and above after 10 min of treatment. Green et al (1939) and Greenfield (1942) also observed a distinct inhibition in the rate of photosynthesis in species of Chlorella as a result of copper sulphate treatment. As observed by them the photosynthesis in the alga is more sensitive than respiration to copper sulphate treatment.…”

Section: Discussionmentioning

confidence: 94%

Morphology and Physiology of Lyngbya nigra with Reference to Copper Toxicity

Gupta

Arora

1978

Physiologia Plantarum

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The effeet of copper sulphate on morphology and physiology of Lyngbya nigra has been studied. The growth was inhibited in all treatments (0.4 to 80.0 ^tM) of eopper sulphate. There were no apparent morphologieal changes up to 0.8 fiM and during the first two days of treatment even in the higher eoneentrations of eopper sulphate.In eoneentrations above 0.8 ixM the first symptom of toxicity was the formation of separation discs in large numbers. The trichomes contracted longitudinally and the cells became swollen and constricted at the cross walls. The eells also beeame yellowish due to loss of photosynthetie pigments. Finally, in 4 /iM and above, vaeuoles appeared in large number indicating the moribund state of the eells.Copper sulphate inereased respiration at 2 fiM, and optimum effeet was observed in 8 nM after 96 h. Inhibition of photosynthesis was deteetable in 0,8 fiM, and 100% inhibition took plaee in 8 ixM after 96 h. In higher eoneentrations the effeet was immediate, and a conspicuous inhibition of photosynthesis couid be observed within 10 min.The copper content of the alga increased with increased concentration of copper sulphate while potassium content decreased. With rise in outside concentrations of copper, there was a comparatively great increase of absorption in 2 and 4 fiM, while further increases were gradually less. The observations indicate that changes in the physiological activity of the alga under treatment are closely interlinked with marked changes in morphology.

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“…It is well established that copper is a required micronutrient for algae; in Chlorella culture deficiency symptoms begin when the copper level is lower than 0.1 Mm (15). Greenfield (2) has reported that photosynthesis in Chlorella was inhibited by copper concentrations higher than 0.1 $M. Recently, it was reported that the effect of copper on photosynthesis and respiration of Chlorella is magnified when copper is applied under anaerobic conditions (1).…”

Section: Resutltsmentioning

confidence: 99%