Desarrollo temprano de roble pellín (Nothofagus obliqua (Mirb.) Oersted.): un análisis arquitectural de procedencias.

PUNTIERI, JAVIER; GROSFELD JAVIER; STECCONI MARINA; BRION CECILIA; AZPILICUETA MARÍA MARTA; GALLO LEONARDO

BOSQUE (VALDIVIA)

Facultad de Ciencias Forestales, Universidad Austral de Chile

Lugar: Valdivia; Año: 2006 vol. 27 p. 44 - 51

0304-8799

The architectural development of three-year-old seedlings of Nothofagus obliqua under nursery conditions was studied. The seedlings were grown from seeds collected from five provenances within the natural distribution area of this species in Argentina. For 40 or more seedlings per provenance we registered the length, number of nodes and basal diameter of the main axis´ annual shoots. The first-year shoot of all seedlings consisted on one extension unit (EU), second-year shoots on one or two EU and third-year shoots on one, two or three EU. The development of a second or third EU always resulted from the death of the apex of the first or second EU respectively. The most evident consequences of the existence of more than one EU in one year were: (a) greater length and number of nodes per shoot in that year, (b) a thicker stem at ground level and (c) a longer extension period. Plants from different provenances differed in the length of the first-year shoot and the proportion of second- and third-year shoots with one or more than one EU.