Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
MITOCHONDRIA CONTRIBUTE TO INCREASED PHOTOSYNTHETIC CAPACITY OF LEAVES OF WINTER RYE (SECALE-CEREALE L) FOLLOWING COLD-HARDENING
Autore:
HURRY V; TOBIAESON M; KROMER S; GARDESTROM P; OQUIST G;
Indirizzi:
AUSTRALIAN NATL UNIV,RES SCH BIOL SCI,COOPERAT RES CTR PLANT SCI,BOX 475 CANBERRA ACT 2601 AUSTRALIA UMEA UNIV,DEPT PLANT PHYSIOL S-90187 UMEA SWEDEN
Titolo Testata:
Plant, cell and environment
fascicolo: 1, volume: 18, anno: 1995,
pagine: 69 - 76
SICI:
0140-7791(1995)18:1<69:MCTIPC>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
SUCROSE-PHOSPHATE SYNTHASE; BARLEY HORDEUM-VULGARE; OXIDATIVE-PHOSPHORYLATION; TERM PHOTOINHIBITION; LOW-TEMPERATURE; WHEAT; PROTOPLASTS; METABOLISM; ACCUMULATION; RESPIRATION;
Keywords:
FROST-HARDENING; LOW TEMPERATURE; OLIGOMYCIN; PHOTOINHIBITION; RESPIRATION; SPS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
37
Recensione:
Indirizzi per estratti:
Citazione:
V. Hurry et al., "MITOCHONDRIA CONTRIBUTE TO INCREASED PHOTOSYNTHETIC CAPACITY OF LEAVES OF WINTER RYE (SECALE-CEREALE L) FOLLOWING COLD-HARDENING", Plant, cell and environment, 18(1), 1995, pp. 69-76

Abstract

Cold-hardening of winter rye (Secale cereale L. cv. Musketeer) increased dark respiration from -2.2 to -3.9 mu mol O-2 m(-2)s(-1) and doubled light- and CO2-saturated photosynthesis at 20 degrees C from 18.1 to 37.0 mu mol O-2 m(-2) s(-1). We added oligomycin at a concentration that specifically inhibits oxidative phosphorylation to see whether the observed increase in dark respiration reflected an increase in respiration in the light, and whether this contributed to the enhanced photosynthesis of cold-hardened leaves, Oligomycin inhibited light- and CO2-saturated rates of photosynthesis in non-hardened and cold-hardened leaves by 14 and 25%, respectively, and decreased photochemical quenching of chlorophyll a fluorescence to a greater degree in cold-hardenedthan in non-hardened leaves, These data indicate an increase both in the rate of respiration in the light, and in the importance of respiration to photosynthesis following cold-hardening, Analysis of metabolite pools indicated that oligomycin inhibited photosynthesis by limitingregeneration of ribulose-1,5-bisphosphate, This limitation was particularly severe in cold-hardened leaves, and the resulting low 3-phosphoglycerate pools led to a feed-forward inhibition of sucrose-phosphate synthase activity, Thus, it does not appear that oxidative phosphorylation supports the increase in photosynthetic O-2 evolution following cold-hardening by increasing the availability of cytosolic ATP, The data instead support the hypothesis that the mitochondria function in thelight by using the reducing equivalents generated by nan-cyclic photosynthetic electron transport.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/12/20 alle ore 15:48:05