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H. Craig (1953)
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Effects de la Radiation globale sur la synthese d ' acides organiques et la regulation stomatique des succulentes . Exemple d ' Ananas comosus ( L . )
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COz assimilation and dissimilation in the light and dark in CAM plants
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Crassulacean acid metabolism
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Gas-Exchange Strategies in Desert Plants
Measurements of acid metabolism and gas exchange were carried out four times during a year to assess the relative importance of temperature and the accompanying seasonal change to the carbon metabolism of Opuntia basilaris Engelm. & Bigel. plants growing in situ under irrigated and natural (control) conditions. Our experiments showed that this cactus did not change its pattern of carbon assimilation when continuously irrigated under field conditions. Non-irrigated cacti had maximum acid accumulation after periods of precipitation. Maximum acid accumulation in irrigated cacti occurred when there was a large difference between day/night temperatures (i.e., 16°C), and when nighttime temperatures were moderate (14C). Irrigated cacti had greater duration of stomatal opening and lower resistance to 14 CO 2 uptake. When temperatures were low, daytime stomatal resistance to 14 CO 2 uptake decreased (to 20–40 s cm -1 ), but never to the level of the nocturnal resistances (5–10 s cm -1 ). During periods of drought, nonirrigated cycti changed to a pattern in which organic acids fluctuated. Irrigated cacti continued to have 14 CO 2 uptake when nighttime temperatures were as high as 33°C. 13 C/ 12 C isotope composition ratios, determined after two years of irrigation, were near -12‰ in irrigated and non-irrigated plants. Therefore, under conditions of continual irrigation, seasonal and temperature changes affected the degree of dark CO 2 fixation and acid metabolism, but these cacti did not change from CAM to CO 2 fixation in the light.
Oecologia – Springer Journals
Published: Jan 1, 1978
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