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Photoperiodic requirements for timing onset and duration of the breeding season of the ewe : synchronization of an endogenous rhythm of reproduction Inra
Wayne, N.L.; Malpaux, B.; Karsch, F.J..
A study was conducted to test the hypothesis that different portions of the annual photoperiodic cycle play different roles in timing the breeding season of the ewe, Ovis aries, an animal in which an endogenous rhythm generates the seasonal reproductive transitions. Adult female sheep were pinealectomized to disrupt transduction of photoperiodic cues at 4 times of the year (summer and winter solstices, vernal and autumnal equinoxes), and the effects on seasonal reproductive neuroendocrine activity were evaluated. Time of pinealectomy greatly influenced the subsequent seasonal reproductive cycle such that the following inferences are possible. Lengthening days between the winter and summer solstices synchronize reproductive onset to the appropriate time of...
Tipo: Journal Article Palavras-chave: PHOTOPERIODE; RHYTHME CIRCANNUEL; SAISON DE REPRODUCTION; CYCLE SEXUEL; SYNCHRONISATION; GLANDE PINEALE CIRCANNUAL RHYTHM; PHOTOPERIOD; PINEAL GLAND; SEASONAL BREEDING.
Ano: 1990 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB9100009746019450&uri=/notices/prodinra1/2010/11/
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Water deficit and induction of summer dormancy in perennial mediterranean grasses Inra
Volaire, F.; Seddaiu, G.; Ledda, L.; Lelièvre, F..
Background and Aims: Summer dormancy is a trait conferring superior drought survival in Mediterranean perennial grasses. As the respective roles of environmental factors and water deficit on induction of summer dormancy are unclear, the effect of intense drought were tested under contrasting day lengths in a range of forage and native grasses. Methods: Plants of Poa bulbosa, Dactylis glomerata ‘Kasbah’ and Lolium arundinaceum ‘Flecha’ were grown in pots (a) from winter to summer in a glasshouse and subjected to either an early or a late-spring drought period followed by a summer water deficit and (b) in controlled conditions, with long days (LD, 16 h) or short days (SD, 9 h) and either full irrigation or water deficit followed by rehydration. Leaf...
Tipo: Journal Article Palavras-chave: DORMANCE ESTIVALE; GRAMINEES PERENNES; PHOTOPERIODE POA BULBOSA; LOLIUM ARUNDINACEUM; ABSCISIC ACID; WATER DEFICIT; PHOTOPERIOD; SUMMER DORMANCY; PERENNIAL GRASS.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010987d1002&uri=/notices/prodinra1/2010/08/
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