Ontogenetic trends in the morphological features of main stem annual shoots of Pinus pinaster (Pinaceae)1

Phase change refers to the transition between juvenile and adult vegetative phases. The study of trees throughout their entire life span requires retrospective analyses and validates the use of a chronosequence by sequencing observations at different and successive stages. The main axis growth patte...

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Veröffentlicht in:American journal of botany 2006-11, Vol.93 (11), p.1577
Hauptverfasser: Heuret, Patrick, Meredieu, Céline, Coudurier, Thierry, Courdier, Florence, Barthélémy, Daniel
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container_issue 11
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container_title American journal of botany
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creator Heuret, Patrick
Meredieu, Céline
Coudurier, Thierry
Courdier, Florence
Barthélémy, Daniel
description Phase change refers to the transition between juvenile and adult vegetative phases. The study of trees throughout their entire life span requires retrospective analyses and validates the use of a chronosequence by sequencing observations at different and successive stages. The main axis growth pattern of 62 maritime pines (Pinus pinaster) selected in a chronosequence of three stands consisting of 8-, 22-, and 48-yr-old trees was analyzed retrospectively. Comparison of measured features (length, number of axillary products, reproductive organs) at common ages from the three stands supported the validity of using these data to form a continuous chronosequence. Endogenous trends in tree development are revealed free from variability due to annual growth conditions. Two main phases of development corresponding respectively to the juvenile vegetative and adult reproductive stages were identified, and the transition between both occurred in 9-yr-old trees. The relevance of these two phases and more generally the notion of phase changes are discussed in light of observed trends in the values of studied growth and branching parameters that may either show gradual variations (such as length of annual shoot) or a distinctive expression in one or the other phase (such as presence of female cones). [PUBLICATION ABSTRACT]
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subjects Botany
Phase transitions
Plant growth
Plant reproduction
Trees
title Ontogenetic trends in the morphological features of main stem annual shoots of Pinus pinaster (Pinaceae)1
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