Variables Affecting the CO<sub>2</sub> Compensation Point

Smith, E. L.; Tolbert, N. E.; Ku, Han

doi:10.1104/pp.58.2.143

Cited by 44 publications

(13 citation statements)

References 17 publications

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“…The same results occurred with C. fracta in a similar study (Cheney and Hough 1983); others have reported that HMS can act as a general inhibitor to photosynthesis (Smith et al 1976) and to other metabolic processes (Lian and Sin 1974).…”

Section: Discussionsupporting

confidence: 80%

Photosynthesis, photorespiration, and productivity in Lemna minor L.1

Filbin

Hough

1985

Limnology & Oceanography

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The roles of aqueous vs. atmospheric CO, fixation, photorespiration, dark respiration, and organic release in the primary productivity of Lemna minor L. were investigated experimentally in field populations and in the laboratory. The mean rate of net photosynthesis through the growth season was 2.48 mg C g-l h-l during which an average of 86% of carbon fixed was from aqueous inorganic carbon. Seasonal variations in photosynthesis correlated principally with light intensity and temperature. Presence of photorcspiration was suggested by early afternoon depressions of photosynthesis, by experimental enhancement and inhibition of photosynthesis with low and high oxygen, respectively, and by enhancement of 1ight:dark respiration ratios with high oxygen. However, under natural conditions L:D ratios were below unity most of the time, and CO, loss in the light was never >4% of photosynthate fixed per hour. Experimental enhancement of photorespiration with oxygen was never as great as the inhibition of photosynthesis at comparable oxygen concentrations.Although plants exhibited a low CO2 compensation point and high light and temperature optima, photosynthesis enzymology and fixation products indicated that C, photosynthesis was not a significant factor in maintenance of the low photorespiration rates.

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Section: Discussionsupporting

confidence: 80%

Photosynthesis, photorespiration, and productivity in Lemna minor L.1

Filbin

Hough

1985

Limnology & Oceanography

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“…We compared the CO 2 compensation point (G) of wild-type and transgenic plants (Fig. 5) because it has been shown previously that senescence or water stress can increase G with a concomitant increase in photorespiration (Smith et al, 1976). No significant differences were observed between wildtype and transgenic plants grown under optimal watering conditions, but differences were seen after 40 d of growth under water-limiting conditions (Fig.…”

Section: Ck-dependent Photorespirationmentioning

confidence: 99%

Cytokinin-Dependent Photorespiration and the Protection of Photosynthesis during Water Deficit

2009

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We investigated the effects of P SARK ::IPT (for Senescence-Associated Receptor Kinase::Isopentenyltransferase) expression and cytokinin production on several aspects of photosynthesis in transgenic tobacco (Nicotiana tabacum cv SR1) plants grown under optimal or restricted (30% of optimal) watering regimes. There were no significant differences in stomatal conductance between leaves from wild-type and transgenic P SARK -IPT plants grown under optimal or restricted watering. On the other hand, there was a significant reduction in the maximum rate of electron transport as well as the use of triose-phosphates only in wild-type plants during growth under restricted watering, indicating a biochemical control of photosynthesis during growth under water deficit. During water deficit conditions, the transgenic plants displayed an increase in catalase inside peroxisomes, maintained a physical association among chloroplasts, peroxisomes, and mitochondria, and increased the CO 2 compensation point, indicating the cytokinin-mediated occurrence of photorespiration in the transgenic plants. The contribution of photorespiration to the tolerance of transgenic plants to water deficit was also supported by the increase in transcripts coding for enzymes involved in the conversion of glycolate to ribulose-1,5-bisphosphate. Moreover, the increase in transcripts indicated a cytokinin-induced elevation in photorespiration, suggesting the contribution of photorespiration in the protection of photosynthetic processes and its beneficial role during water stress.

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“…It was noted earlier in Fig. Smith et al (1976) found that the C02 compensation point fell when plants were exposed to solutions containing organic solvents. It is unlikely that the higher ci levels observed after the first leachate treatment were caused by increased plant respiration given their condition of acute stress.…”

Section: Discussionmentioning

confidence: 63%

Physiological Responses of Red Maple Saplings To Sub-Irrigation With an Untreated Municipal Landfill Leachate

Shrive

McBride

1995

Waste Manag Res

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An experiment was undertaken to examine the response of hydroponically-grown red maple ( Acer rubrum L.) saplings to a series of four flooding (sub-irrigation) treatments distributed over a 25-day period with an untreated (saline) municipal solid waste landfill leachate or deionized water. Net photosynthesis rates measured for water-treated saplings rapidly declined to 62% of the levels measured in untreated (control) saplings, but returned to pre-treatment levels with subsequent flooding treatments. Net photosynthesis rates measured for leachate-treated saplings decreased to about 50% of the levels measured for control saplings over the 25-day treatment period, and remained suppressed. Loss of turgor in leaves and a iron-oxyhydroxide plaque on root surfaces were also observed. Reasons proposed for this acute and apparently irreversible response to leachate exposure include: (i) extreme root anaerobiosis conditions caused by root system flooding and exacerbated by a high chemical oxygen demand leachate; (ii) increased root-soil interface resistance to transpiration water flow (osmotic potential gradient, iron oxyhydroxide plaque); (iii) metabolic intolerance to high solute concentrations in plant tissue; and (iv) exposure to potentially toxic volatile organic compounds. Water sub-irrigation had virtually no effect on nutrient and non-nutrient element concentrations in foliage or on the spectral reflectance characteristics of the leaves. Leachate treatment decreased the foliar content of many plant macro-and micro-nutrients significantly, and shifts in spectral reflectance patterns indicated declining plant vigour. Certain chemical constituents present in high concentrations in the leachate irrigant and which can be phytotoxic, such as Cl, accumulated to a significant degree in leachate-treated plant tissue.

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Variables Affecting the CO₂ Compensation Point

Cited by 44 publications

References 17 publications

Photosynthesis, photorespiration, and productivity in Lemna minor L.1

Photosynthesis, photorespiration, and productivity in Lemna minor L.1

Cytokinin-Dependent Photorespiration and the Protection of Photosynthesis during Water Deficit

Physiological Responses of Red Maple Saplings To Sub-Irrigation With an Untreated Municipal Landfill Leachate

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Variables Affecting the CO2 Compensation Point

Cited by 44 publications

References 17 publications

Photosynthesis, photorespiration, and productivity in Lemna minor L.1

Photosynthesis, photorespiration, and productivity in Lemna minor L.1

Cytokinin-Dependent Photorespiration and the Protection of Photosynthesis during Water Deficit

Physiological Responses of Red Maple Saplings To Sub-Irrigation With an Untreated Municipal Landfill Leachate

Contact Info

Product

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Variables Affecting the CO₂ Compensation Point