Field Studies of the Carbon Dioxide Absorption of Coco-nut Leaves

McLean, Forman T.

doi:10.1093/aob/os-34.3.367

Cited by 18 publications

(5 citation statements)

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“…per hour in order to make them comparable with Lnndegardh's figures (1931). The assimilation/time curve is saddle-shaped, and similar in this respect to those descrihed hy McLean (1920) and Thoday (1910). This depression is due to partial closure of the stomates during the midday period, as shown by Maximov's field method.…”

Section: Carbon Assimilationsupporting

confidence: 61%

“…cms., was enclosed in a glass vessel by means of a divided cork, and air drawn over the leaf. Tn the first experiments the rate of tJow was 20 litres per hour, since this rate was found necessary hy McLean (1920) for sngar cane, hut was suhsequently reduced to ]0 litres per hour. No appreciable difference in carhon assimilation occurred at these two rates.…”

Section: Carbon Assimilationmentioning

confidence: 98%

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The Physiology of Xerophytism in Australian Plants

Wood

1932

Aust J Exp Biol Med

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Section: Carbon Assimilationsupporting

confidence: 61%

Section: Carbon Assimilationmentioning

confidence: 98%

The Physiology of Xerophytism in Australian Plants

Wood

1932

Aust J Exp Biol Med

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“…The air interacted with the plant and was then passed through a solution, such as barium hydroxide, which absorbed CO 2 . The quantity of CO 2 absorbed by the solution was measured by titration and compared with the amount of CO 2 absorbed by a control solution to determine the rate of assimilation (McLean, 1920; Kostytschew et al ., 1928). Later, researchers modified this method by estimating absorbed CO 2 from the electrical resistance of the solution (Spoehr & McGee, 1924).…”

Section: Introductionmentioning

confidence: 99%

Fast Assimilation‐Temperature Response: a FAsTeR method for measuring the temperature dependence of leaf‐level photosynthesis

Garen,

Michaletz

2023

New Phytologist

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Summary We present the Fast Assimilation‐Temperature Response (FAsTeR) method, a new method for measuring plant assimilation‐temperature (AT) response that reduces measurement time and increases data density compared with conventional methods. The FAsTeR method subjects plant leaves to a linearly increasing temperature ramp while taking rapid, nonequilibrium measurements of gas exchange variables. Two postprocessing steps are employed to correct measured assimilation rates for nonequilibrium effects and sensor calibration drift. Results obtained with the new method are compared with those from two conventional stepwise methods. Our new method accurately reproduces results obtained from conventional methods, reduces measurement time by a factor of c. 3.3 (from c. 90 to 27 min), and increases data density by a factor of c. 55 (from c. 10 to c. 550 observations). Simulation results demonstrate that increased data density substantially improves confidence in parameter estimates and drastically reduces the influence of noise. By improving measurement speed and data density, the FAsTeR method enables users to ask fundamentally new kinds of ecological and physiological questions, expediting data collection in short‐field campaigns, and improving the representativeness of data across species in the literature.

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“…Since the optimal depth depends so closely on the light intensity, its (1920) and Yap (1920) have shown that the rate of photosynthesis of sugar-cane in the Philippines increases rapidly from about 7.30 a.m. to 9.30 a.m. and falls slightly in the middle of the day, rising again to a maximum about 5 p.m. An experiment was carried out to find the actual course of photosynthesis in the sea on a sunny day. Cages were sunk to 0, t, 1, 2, 3, 4, and 6 metres, and were changed every 3 hours over 24 hours.…”

mentioning

confidence: 99%

The Photosynthesis of Diatom Cultures in the Sea

Marshall

Orr²

1928

J. Mar. Biol. Ass.

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With 24 Figures in the Text.PHOTOSYNTHESIS in the opensea is duemainly to two groupsoforganisms, the diatoms and the dinoflagellates. In British seas the diatoms are so much more numerous that the chemical changes which are due to photosynthetic activity can be almost entirely ascribed to their influence. Recent work on these chemical chang.es has shown that they do not ,extend deeper than about 30 metres. Of the external limiting factors light is among the most important and the depth to which photosynthesis can go on must, of course, depend on the light intensity. In the study ()f the phytoplankton under natural conditions the results are compli-(Jated by the interaction of many other factors such as temperature, viscosity, or lack of food salts, so that it is difficult to come to definite (Jonclusions on the effect of light alone.Early experimental work on the effect of light at different depths was carried out at Monaco by Regnard (1891), who germinated seeds of ,cress and radish at different depths, and found that little chlorophyll was formed at 30 metres. He also estimated the oxygen production of DIva over a day, and found that this was too low to measure at 8 and 10 metres. His method, however, was not a delicate one. Jonsson (1903), in the Oslo fjord, using the moss Olimacium dendroides, found that photo-,synthesis fell off rapidly from the surface, and was not appreciable below 17-27 metres. More recently Gaarder and Gran (1927), using samples of sea-water rich in diatoms, found that photosynthesis was ,considerably less below than at the surface, and that at about 10 metres photosynthesis and respiration just balanced each other. Considering the methods used, and the differences in latitude and season there is probably no real discrepancy in the results of these different observers.While the results of Gaarder and Gran probably give a true picture of

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Field Studies of the Carbon Dioxide Absorption of Coco-nut Leaves

Cited by 18 publications

References 0 publications

The Physiology of Xerophytism in Australian Plants

The Physiology of Xerophytism in Australian Plants

Fast Assimilation‐Temperature Response: a FAsTeR method for measuring the temperature dependence of leaf‐level photosynthesis

The Photosynthesis of Diatom Cultures in the Sea

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