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Titolo:
EVIDENCE THAT PHOTOPERIODIC, DARK TIME MEASUREMENT IN PHARBITIS-NIL INVOLVES A CIRCADIAN RATHER THAN A SEMIDIAN RHYTHM
Autore:
LUMSDEN PJ; YOUNGS JA; THOMAS B; VINCEPRUE D;
Indirizzi:
UNIV CENT LANCASHIRE,DEPT APPL BIOL PRESTON PR1 2HE LANCS ENGLAND HORT RES INT,DEPT MOLEC & ENVIRONM PHYSIOL LITTLEHAMPTON BN17 6LP W SUSSEX ENGLAND
Titolo Testata:
Plant, cell and environment
fascicolo: 12, volume: 18, anno: 1995,
pagine: 1403 - 1410
SICI:
0140-7791(1995)18:12<1403:ETPDTM>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
FAR-RED LIGHT; FLOWERING RESPONSE; PHYTOCHROME; INDUCTION;
Keywords:
PHARBITIS NIL; CONVOLVULACEAE; JAPANESE MORNING GLORY; PHOTOPERIODISM; FLORAL INDUCTION; CIRCADIAN RHYTHM;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
22
Recensione:
Indirizzi per estratti:
Citazione:
P.J. Lumsden et al., "EVIDENCE THAT PHOTOPERIODIC, DARK TIME MEASUREMENT IN PHARBITIS-NIL INVOLVES A CIRCADIAN RATHER THAN A SEMIDIAN RHYTHM", Plant, cell and environment, 18(12), 1995, pp. 1403-1410

Abstract

Experiments were carried out to determine whether a semidian (12 h) rhythm in flowering response operates in Pharbitis nil as the basis forphotoperiodic time measurement, The effect of 5 min far-red light followed by 85 min dark (FRD) given 4, 8, 14 and 22 h before the end of a48 h photoperiod on night-break timing and critical night length was determined, When given 4 h before the end of a 48 h photoperiod, an interruption with FRD advanced the phase of the circadian rhythm in the night-break inhibition of flowering, In contrast, earlier interruptions of the photoperiod had no effect on the phase of the rhythm, The critical night length was modified by FRD given 4 h (shortened) or 8 h (lengthened) before the end of the photoperiod; when given at other times FRD did not alter the critical night length, The results are discussed in relation to the basis for photoperiodic timekeeping, with particular reference to suggestions for the involvement of a semidian rhythm, A circadian model based on the concept of limit cycles is described.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 16/07/20 alle ore 19:36:37