Limitations to Photosynthesis Responsible for Differences Among Species<sup>1</sup>

Hesketh, J. D.

doi:10.2135/cropsci1963.0011183x000300060011x

Cited by 170 publications

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“…The same is true at low light levels. The rates of photosynthetic CO2 uptake/dm2 hr for the mutant and wild-type leaves are about equal to those found in cotton leaves at 600 /A/1 Co2,42 to 45 mg CO, fixed/dm2 hr (9). As shown in Table I (3,11,20) and in this respect approaches the rate of CO2 fixation of C4 plants.…”

Section: Methodsmentioning

confidence: 55%

High Photosynthetic Rate of a Chlorophyll Mutant of Cotton

Benedict

McCree²,

Kohel³

1972

Plant Physiol.

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In a chlorophyll mutant (virescent) and wild-type cotton (Gossypium hirsutum L.), a number of photosynthetic parameters have been measured and compared with those published for other chlorophyli mutants. (a) The photosynthetic rates at 230 w/m2 (400-700 nm) from a tungsten lamp were 36.8 mg C02 fixed/dm2*hr (virescent) and 39.5 mg CO2 fixed/dm' hr (wild-type). On a chlorphyll basis, the photosynthetic rates were 36.8 and 12.1 mg CO2 fixed/mg chl-hr, respectively. (b) The photosynthetic rates at 13 w/m2 (400-700 nm) from a tungsten source were 7.1 mg C02 fixed/ dm2-hr (virescent) and 7.4 mg C02 fixed/dm2 hr (wild-type).On a chlorophyll basis, the photosynthetic rates were 6.0 and 1.4 mg C02 fixed/mg chl hr, respectively. (c) The There have recently been a number of investigations on the photosynthetic characteristics and high photosynthetic rates of different chlorophyll mutants (2-4, 10, 11, 13, 14, 17-21, 25 (8,12).In this paper we have studied the high photosynthetic rate of a chlorophyll mutant of cotton in relation to the type of photosynthetic carbon metabolism (C3 or C4)2, the CO2 compensation point, the level of some enzymes of the reductive pentose phosphate cycle, and the relative quantum yield.MATERIALS AND METHODS Materials. 3-Phosphoglyceric phosphokinase, glyceraldehyde-3-P dehydrogenase, D(-)3-phosphoglyceric acid tricyclohexylammonium salt, D-fructose-1,6-diP tetracyclohexylammonium salt, D-glucose-6-P disodium salt, ribulose-1 ,5-diP tetrasodium salt, NADH, NADPH, ATP, and GSH were obtained from Sigma Chemical Company.' Phosphoenolpyruvic acid monocyclohexylammonium salt was obtained from Nutritional Biochemical Co.Plants

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Section: Methodsmentioning

confidence: 55%

High Photosynthetic Rate of a Chlorophyll Mutant of Cotton

Benedict

McCree²,

Kohel³

1972

Plant Physiol.

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“…In contrast, Evans and Dunstone (1970) have shown that the modern wheats actually have lower photosynthetic rates per unit leaf area than the wild progenitors. Ilowever, the discovery that certain species had much higher rates of net photosynthesis in bright light (Hesketh 1963) stimulated further search for varietal differences in this characteristic, despite the earlier rather discot.uaging results.…”

Section: Introductionmentioning

confidence: 99%

Some Differences Between Soybean Cultivars Observed by Growth Analysis

Buttery¹,

Buzzell²

1972

Can. J. Plant Sci.

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“…The response of maize AP to CO2 concentration here has the curvilinearity characteristic of this species ( 11 ) and is markedly different from the more nearly linear response of an inefficient species such as tobacco (11,27). When The dissimilar parameters of the hyperbolae for these 2 species predict that the CO2 response functions for corn and tobacco will converge when the CO2 is increased, and at low irradiance they do (27).…”

Section: Discussionmentioning

confidence: 56%

Relation of CO₂ Compensation Concentration to Apparent Photosynthesis in Maize

Heichel

Musgrave

1969

Plant Physiol.

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,1u CO2/l air) for species with inefficient photosynthesis and high photorespiration, and low (<10 pI CO2/l air) for species with efficient photosynthesis and negligi-ble photorespiration (4,16,25,26).Maize belongs to this latter group (14, 16), and has a rCO2L, independent of°2 concentration (15,20).Recent models demonstrate that the magnitude of the [CO2], depends upon the diffusive resistance of the leaf to CO2, the efficiency of CO2 fixation in the chloroplasts, and the respiration rate of the leaf (1,21,24).A second, lesser used, method exists for predicting the photosynthetic efficiency of leaves. The Michaelis constant (Km) of a leaf has been postulated (7) as "the external CO2 concentration which enables the leaf, at saturating light intensity, to fix CO2 at half the maximal velocity". The Km depends upon the affinity of the carboxylating enzymes for CO2, the diffusive resistance of the leaf, and the rate of respiration. Thus Zelitch (27), whose convention we adopt, designates the Km for a leaf as an "overall Michaelis constant". Goldsworthy (7) and Zelitch (27) found that the Km for photosynthesis of maize was only 10 to 15 % lower than tobacco

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Limitations to Photosynthesis Responsible for Differences Among Species¹

Cited by 170 publications

References 0 publications

High Photosynthetic Rate of a Chlorophyll Mutant of Cotton

High Photosynthetic Rate of a Chlorophyll Mutant of Cotton

Some Differences Between Soybean Cultivars Observed by Growth Analysis

Relation of CO₂ Compensation Concentration to Apparent Photosynthesis in Maize

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Limitations to Photosynthesis Responsible for Differences Among Species1

Cited by 170 publications

References 0 publications

High Photosynthetic Rate of a Chlorophyll Mutant of Cotton

High Photosynthetic Rate of a Chlorophyll Mutant of Cotton

Some Differences Between Soybean Cultivars Observed by Growth Analysis

Relation of CO2 Compensation Concentration to Apparent Photosynthesis in Maize

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Product

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Limitations to Photosynthesis Responsible for Differences Among Species¹

Relation of CO₂ Compensation Concentration to Apparent Photosynthesis in Maize