Fait partie de [OMC12]

1995 - 280 p.

Time to flowering of Medicago polymorpha ecotypes and cultivars in response to temperature and photoperiod

Del Pozo A., Ovalle C., Avendaño J.

Time to flowering of nine Chilean accessions and two Australian cultivars of Medicago polymorpha was measured on twelve sequential outdoor sowings in Cauquenes (35 degrees 58 minutes S, 72 degrees 17 minutes W; elev. 177 m), in the subhumid Mediterranean region of Chile. The rate of progress to flowering (l/f), defined as the inverse of the time from emergence to flowering, was related to mean diurnal temperature (model 1) or to both mean diurnal temperature and mean photoperiod (model 2). There was a clear gradient in earliness among the Chilean accessions at all the sowing dates; Ovalle and Combarbalá, both from the arid Mediterranean region, were the earliest flowering accessions, whereas Traiguen, from the humid Mediterranean region, was the latest. Among the Australian cultivars, Santiago was the earliest flowering cultivar. Model 2 accounted for a great proportion (between 81 and 96 per cent) of the observed variation in flowering within accessions. A great variation on the sensitivity of rate of flowering to temperature and photoperiod was found among the Chilean accessions and the Australian cultivars.

Mots-clés    

FLORAISON, MEDICAGO POLYMORPHA, PHOTOPERIODICITE, PHYTOECOLOGIE, TEMPERATURE

Citer cet article    

Del Pozo A., Ovalle C., Avendaño J. Time to flowering of Medicago polymorpha ecotypes and cultivars in response to temperature and photoperiod. Systèmes sylvopastoraux. Pour un environnement, une agriculture et une économie durables . Zaragoza : CIHEAM, 1995. p. 33-36. (Cahiers Options Méditerranéennes; n. 12). Réunion du Groupe de Travail Méditerranéen du Réseau Interrégional FAO/CIHEAM de Recherche et Développement sur les Pâturages et les Cultures Fourragères, 1995/05/29-1995/06/02, Avignon (France). http://om.ciheam.org/om/pdf/c12/96605480.pdf