1973
DOI: 10.1104/pp.52.1.33
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The Effect on Net Photosynthesis of Pedigree Selection for Low and High Rates of Photorespiration in Tobacco

Abstract: A normal appearing plant with a low rate of photorespiration (ratio of UCO2 released light/dark = 1.6) was found in an unselected tobacco (Nicotiana tabacum) cultivar. The plant was self-pollinated, and further selections were made on several successive generations. Excised leaves from the progeny of the selections were examined for photorespiration and net C02 assimilation in normal air during photosynthesis. Similar measurements were made of plants derived from selfed parents with high rates of photorespirat… Show more

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Cited by 49 publications
(23 citation statements)
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References 13 publications
(14 reference statements)
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“…Trin., is intermediate between C3 and C4 plants with respect to photorespiration. In contrast to other reports in the literature of C3 species with altered rates of photorespiration (4,12,14,(21)(22)(23), this observation has been independently confirmed in several laboratories based on a variety of CO2 exchange parameters, including reductions in the 02 inhibition of net photosynthesis, the CO2 compensation concentration (F)2, and the rate of CO2 evolution in the light (2,3,8,10,12).…”
Section: Introductioncontrasting
confidence: 49%
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“…Trin., is intermediate between C3 and C4 plants with respect to photorespiration. In contrast to other reports in the literature of C3 species with altered rates of photorespiration (4,12,14,(21)(22)(23), this observation has been independently confirmed in several laboratories based on a variety of CO2 exchange parameters, including reductions in the 02 inhibition of net photosynthesis, the CO2 compensation concentration (F)2, and the rate of CO2 evolution in the light (2,3,8,10,12).…”
Section: Introductioncontrasting
confidence: 49%
“…Trin., is intermediate between C3 and C4 plants with respect to photorespiration. In contrast to other reports in the literature of C3 species with altered rates of photorespiration (4,12,14,(21)(22)(23), this observation has been independently confirmed in several laboratories based on a variety of CO2 exchange parameters, including reductions in the 02 inhibition of net photosynthesis, the CO2 compensation concentration (F)2, and the rate of CO2 evolution in the light (2,3,8,10,12).Although leaf anatomical studies of P. milioides have revealed some features of Kranz anatomy characteristic of C4 plants (2, 3, 9), biochemical investigations (8)(9)(10)(11)13) indicate that this species has not reduced photorespiration and the associated 02 inhibition of photosynthesis by a C4-like CO2 concentrating mechanism (5). For example, the primary products of photosynthesis in 14CO2-air are 3-P-glycerate and glycerate rather than C4 dicarboxylic acids (8,9,11).…”
contrasting
confidence: 53%
“…When the discs were exposed to glutamate, 27,700 cpm were released in the light in 30 min and 66,400 cpm in 60 min of darkness. The resulting ratios of 14C02 released in light/dark were 2.6 for the discs on water (a reasonable ratio for tobacco [28]) and 0.8 for the discs on glutamate. Glutamate supplied under these conditions decreased the rate of CO2 released by leaf discs in the light about 60% and had no substantial effect on dark respiration.…”
Section: Resultsmentioning
confidence: 99%
“…These experiments with glutamate raise the question of whether changes in the ratio of photosynthetic CO2 fixation to photorespiratory CO2 release normally occur in C3 plants by the mechanism induced by adding glutamate or other metabolites. Individual tobacco plants with slower rates of photorespiration and increased net photosynthesis have been observed (27,28), but the extent of normal fluctuations in the pool sizes of glutamate, aspartate, and related compounds during photosynthesis is not known. The inhibition of glycolate synthesis (23) and photorespiration (25), always found in leaves of C4 species such as maize, may be brought about in part by the higher concentration of aspartate present in the bundle sheath cells (9).…”
Section: Resultsmentioning
confidence: 99%
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