Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
LOW-TEMPERATURE STRESS AND PHOTOPERIOD AFFECT AN INCREASED TOLERANCE TO PHOTOINHIBITION IN PINUS-BANKSIANA SEEDLINGS
Autore:
KROL M; GRAY GR; HURRY VM; OQUIST G; MALEK L; HUNER NPA;
Indirizzi:
UNIV WESTERN ONTARIO,DEPT PLANT SCI LONDON ON N6A 5B7 CANADA UNIV WESTERN ONTARIO,DEPT PLANT SCI LONDON ON N6A 5B7 CANADA AUSTRALIAN NATL UNIV,RES SCH BIOL SCI,COOPERAT RES CTR PLANT SCI CANBERRA ACT 2601 AUSTRALIA UMEA UNIV,DEPT PLANT PHYSIOL S-90187 UMEA SWEDEN LAKEHEAD UNIV,DEPT BIOL THUNDER BAY ON P7B 5E1 CANADA
Titolo Testata:
Canadian journal of botany
fascicolo: 8, volume: 73, anno: 1995,
pagine: 1119 - 1127
SICI:
0008-4026(1995)73:8<1119:LSAPAA>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
ACCLIMATED SPINACH LEAVES; CHLOROPHYLL FLUORESCENCE; SCOTS PINE; TERM PHOTOINHIBITION; COLD-ACCLIMATION; PHOTOSYSTEM-II; WINTER RYE; PHOTOSYNTHESIS; LIGHT; PLANTS;
Keywords:
ANTHOCYANIN; LIGHT ATTENUATION; LOW TEMPERATURE; PINUS BANKSIANA LAMB (JACK PINE); PHOTOSYNTHESIS; PHOTOINHIBITION; PHOTOPERIOD;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
43
Recensione:
Indirizzi per estratti:
Citazione:
M. Krol et al., "LOW-TEMPERATURE STRESS AND PHOTOPERIOD AFFECT AN INCREASED TOLERANCE TO PHOTOINHIBITION IN PINUS-BANKSIANA SEEDLINGS", Canadian journal of botany, 73(8), 1995, pp. 1119-1127

Abstract

The capacity to develop tolerance to photoinhibition of photosynthesis was assessed in jack pine seedlings (Pinus banksiana Lamb.). Photoinhibition induced at 5 degrees C in control jack pine seedlings grown at 20 degrees C was saturated above an irradiance of 1000 mu mol . m(-2). s(-1) but was detectable at an irradiance as low as 25 mu mol . m(-2). s(-1). However, 20 degrees C seedlings shifted to 5 degrees C were2-fold more tolerant to photoinhibition than 20 degrees C unshifted control seedlings, as detected by either the light-dependent decrease in photochemical efficiency or the apparent quantum yield of O-2 evolution. The extent of this tolerance of photoinhibition was dependent upon time, photoperiod, and irradiance during exposure to the low-temperature shift. Furthermore, the tolerance of photoinhibition was correlated with anthocyanin accumulation in 20 degrees C grown seedlings shifted to 5 degrees C. In addition, seedlings shifted to 5 degrees C and an 8-h photoperiod exhibited a 2-fold higher yield of photosystem II electron transport, which was associated with an increased capacity to keep Q(A), the first stable quinone electron acceptor of photosystem II, oxidized at high irradiance. This was consistent with a 2-fold higher rate of photosynthesis on a chlorophyll basis. We propose that the combination of light attenuation by anthocyanin in the epidermis and enhanced rates of photosynthesis may, in part, account for the reduced sensitivity of jack pine to photoinhibition at low temperature.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/12/20 alle ore 15:56:41