Seasonal variation of organogenetic activity and reserves allocation in the shoot apex of Pinus pinaster Ait.

ABSTRACT:

Background and aims

To understand better the basic growth characteristics of pines and the fundamental properties of the shoot apical meristem (SAM), variations within the shoot apex of buds were studied.

Methods

A detailed structural comparison of meristem dimensions, organogenetic activity, and the presence of lipids, starch grains and tannins was performed on shoot apices of juvenile, and male and female adult Pinus pinaster at five different times in the annual growth cycle.

Key results

There were significant correlations among traits and differences in the pattern for juvenile and adult shoots. In juvenile shoots, peaks of organogenesis were present in spring and autumn, but not in summer. In adult shoots, one peak, characterized by an increase in meristem dimens

SUBMITTER: Jordy MN 

PROVIDER: S-EPMC4242259 | biostudies-literature | 2004 Jan

REPOSITORIES: biostudies-literature