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Titolo:
FUNCTIONING OF THE TONOPLAST IN VACUOLAR C-STORAGE AND REMOBILIZATIONIN CRASSULACEAN ACID METABOLISM
Autore:
LUTTGE U; FISCHERSCHLIEBS E; RATAJCZAK R; KRAMER D; BERNDT E; KLUGE M;
Indirizzi:
TH DARMSTADT,INST BOT,SCHNITTSPAHNSTR 3-5 D-64287 DARMSTADT GERMANY
Titolo Testata:
Journal of Experimental Botany
, volume: 46, anno: 1995,
pagine: 1377 - 1388
SICI:
0022-0957(1995)46:<1377:FOTTIV>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
PLANT KALANCHOE-DAIGREMONTIANA; TRANSLOCATING INORGANIC PYROPHOSPHATASE; MESEMBRYANTHEMUM-CRYSTALLINUM L; ENERGY-DEPENDENT UPTAKE; VESICLE PROTON PUMP; CLUSIA-MINOR L; CAM PLANT; ATPASE ACTIVITY; ELECTRON-MICROSCOPY; NEUROSPORA-CRASSA;
Keywords:
CRASSULACEAN ACID METABOLISM; CARBON STORAGE; CARBOXYLATE TRANSPORTER; TONOPLAST; H+-PP(I)ASE; V0V1-H+-ATPASE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
78
Recensione:
Indirizzi per estratti:
Citazione:
U. Luttge et al., "FUNCTIONING OF THE TONOPLAST IN VACUOLAR C-STORAGE AND REMOBILIZATIONIN CRASSULACEAN ACID METABOLISM", Journal of Experimental Botany, 46, 1995, pp. 1377-1388

Abstract

Nocturnal fixation of CO2 and storage of carbon in the form of malic acid in vacuoles of photosynthetically active cells are key processes of crassulacean acid metabolism (CAM), A prerequisite for malate transport into the vacuole is the concerted action of primary-active H+-pumps, i.e. the tonoplast V0V1-H+-ATPase and H+-PP(i)ase, and a secondary-active carboxylate transporter, During the transition from C-3-photosynthesis to CAM the H+-ATPase of the C-3/CAM-intermediate plant Mesembryanthemum crystallinum undergoes particular structural changes indicating an adaptation of the enzyme to the requirements for an increased capacity of tonoplast transport systems, The role of the H+-PP(i)ase in energization of carbon transport in CAM remains unclear, While in Kalanchoe blossfeldiana cv, Tom Thumb, where CAM is induced by shortening of daylength, there is a higher expression of the H+-PP(i)ase in theCAM state as compared to the C-3-state, the enzyme disappears in M. crystallinum when CAM is induced by salt stress. However, the H+-PPase could also be involved in the regulation of the H+-ATPase as shown by the PPi-stimulated ATP-dependent H+-transport activity found in K. daigremontiana and K. blossfeldiana cv, Tom Thumb, Although the tonoplastcarboxylate transporter has not yet been identified, the kinetic parameters of the enzyme were characterized after partial purification andfunctional reconstitution into proteoliposomes, While the influx of malate into the vacuole is mediated by the co-operation of different enzymes, the regulation of the passive efflux of malic acid from the tonoplast during the day may depend on biophysical membrane properties, i,e, the degree of order of the vacuolar membrane, which seems to be modulated by Ca2+.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 10/07/20 alle ore 19:16:56