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Influence of Applied Nacl on Crassulacean Acid Metabolism and Ionic Levels in a Cactus, Cereus validus

Nobel, Park S. ; Lüttge, Ulrich ; Sabine Heuer ; Ball, Erika

Plant Physiol.; (United States), 1984-07, Vol.75 (3), p.799-803 [Periódico revisado por pares]

Rockville, MD: American Society of Plant Physiologists

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Título:
Influence of Applied Nacl on Crassulacean Acid Metabolism and Ionic Levels in a Cactus, Cereus validus
Autor: Nobel, Park S. ; Lüttge, Ulrich ; Sabine Heuer ; Ball, Erika
Assuntos: 560303 - Chemicals Metabolism & Toxicology- Plants- (-1987) ; Acidity ; ALKALI METAL COMPOUNDS ; BIOLOGICAL ACCUMULATION ; Biological and medical sciences ; BIOLOGICAL EFFECTS ; BIOLOGICAL STRESS ; CACTI ; Cactus ; CARBON COMPOUNDS ; CARBON DIOXIDE ; CARBON OXIDES ; CARBOXYLIC ACIDS ; CHALCOGENIDES ; Chlorenchyma ; CHLORIDES ; CHLORINE COMPOUNDS ; Crassulacean acid metabolism ; DAILY VARIATIONS ; DISTRIBUTION ; DOSE-RESPONSE RELATIONSHIPS ; ELECTROMAGNETIC RADIATION ; ELECTRON TRANSFER ; ESTERS ; Fundamental and applied biological sciences. Psychology ; HALIDES ; HALOGEN COMPOUNDS ; HYDROXY ACIDS ; INHIBITION ; MALIC ACID ; METABOLISM ; NECROSIS ; ORGANIC ACIDS ; ORGANIC COMPOUNDS ; OXIDES ; OXYGEN COMPOUNDS ; Parenchyma ; PATHOLOGICAL CHANGES ; Photosynthesis, respiration. Anabolism, catabolism ; Plant physiology and development ; Plant roots ; PLANT STEMS ; PLANTS ; RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT ; RADIATIONS ; ROOTS ; Salinity ; SODIUM CHLORIDES ; SODIUM COMPOUNDS ; Table salt ; TISSUE DISTRIBUTION ; VARIATIONS ; VISIBLE RADIATION
É parte de: Plant Physiol.; (United States), 1984-07, Vol.75 (3), p.799-803
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
AC03-76SF00012
Descrição: To determine possible physiological responses to salinity, seedlings of Cereus validus Haworth, a cactus from Salinas Grandes, Argentina, were treated with up to 600 millimolar NaCl for up to 16 days when they were about 9 months old and 100 millimeters tall. Salt stress decreased stem biomass, e.g. it was 19.7 grams for controls and 11.4 grams for plants treated with 400 millimolar NaCl for 14 days. Nocturnal CO2 uptake in these obligate Crassulacean acid metabolism (CAM) plants was inhibited 67% upon treatment with 400 millimolar NaCl for 14 days (controls, 181 millimoles CO2 per square meter), while nocturnal accumulation of malate was inhibited 49% (controls, 230 millimoles malate per square meter). The larger accumulation of malate as compared to uptake of atmospheric CO2 suggests that internal CO2 recycling occurred during the dark period. Such recycling was lower in the controls (∼20%) than in the NaCl-treated plants (∼50%). The nocturnal increase in malate and titratable acidity depended on the total daily photosynthetically active radiation available; measurements suggest a quantum requirment of 26 photons per malate. As NaCl in the medium was increased to 600 millimolar in daily increments of 50 millimolar, Na and Cl concentrations in the roots increased from about 7 to 100 millimolar, but K concentration in the cell sap remained near 26 millimolar. Concomitantly, concentrations of Na and Cl in the shoots increased from 8 to 17 millimolar and from 1 to 7 millimolar, respectively, while the K concentration increased about 16 to 60 millimolar. In plants maintained for 14 days at 500 millimolar NaCl, the root levels of Na and Cl increased to 260 millimolar, the shoot levels were about 60 millimolar, and the stem bases began to become necrotic. Such Na retention in the roots together with the special possibilities of carbon reutilization given by CAM are apparently survival mechanisms for the temporarily saline conditions experienced in its natural habitat.
Editor: Rockville, MD: American Society of Plant Physiologists
Idioma: Inglês

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Influence of Applied Nacl on Crassulacean Acid Metabolism and Ionic Levels in a Cactus, Cereus validus

Nobel, Park S. ; Lüttge, Ulrich ; Sabine Heuer ; Ball, Erika

Rockville, MD: American Society of Plant Physiologists

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