How did Conifers grow in Mesozoic times? : A Jurassic case of growth architecture in Araucariaceae from the La Matilde Formation, Patagonia, Argentina

The architecture of a plant represents the expression of the equilibrium between endogenous growth processes and environmental constraints. Simple morphological traits are used to describe a tree's architecture: the growth and branching process, the morphological differentiation of axes, and th...

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Autores principales: Falaschi, Paula, Grosfeld, J., Foix, N., Rivera, Stella Maris
Formato: Objeto de conferencia Resumen
Lenguaje:Inglés
Publicado: 2010
Materias:
Ciencias Naturales
Paleontología
Conifers
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/16865
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-16865
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Paleontología
Conifers
spellingShingle Ciencias Naturales
Paleontología
Conifers
Falaschi, Paula
Grosfeld, J.
Foix, N.
Rivera, Stella Maris
How did Conifers grow in Mesozoic times? : A Jurassic case of growth architecture in Araucariaceae from the La Matilde Formation, Patagonia, Argentina
topic_facet Ciencias Naturales
Paleontología
Conifers
description The architecture of a plant represents the expression of the equilibrium between endogenous growth processes and environmental constraints. Simple morphological traits are used to describe a tree's architecture: the growth and branching process, the morphological differentiation of axes, and the position of reproductive structures. The purpose of this contribution is to describe the growth architecture of the Jurassic araucarian trees (in organic connection with Araucaria mirabilis (Spegazzini) emend. Calder cones) present at the most basal part of the La Matilde Formation in the locality of Monumento Natural Bosques Petrificados, Santa Cruz province, Argentina, and to compare them with extant Araucariaceae. Both young and adult specimens had three branching categories from trunk (TA1) to branchlets (A3), corresponding to the typical pattern in extant Araucariaceae. The main, orthotropic stem (TA1) had rhythmic growth and branching, bearing plagiotropic branches in pseudowhorls. Main branches (A2) had rhythmic branching with A3 in two orthostichies. Female cones were terminal at the tip of peduncles, lateral in position with respect to A2 branches, peduncles had a position equivalent to A3 branches. Reiteration patterns are present: total reiterations (bifurcated trunks and big orthotropic branches in trunks with normal plagiotropic branches) and partial reiterations (epicormic branching). Two architectural "morphotypes" were recognized: the "Araucarioid morphotype or morphotype A" includes most of the studied specimens; showing pseudowhorls of plagiotropic branches and reiteration evidences; these characters correspond to Massart's model. "Morphotype B" was observed in bigger trunks, with clearly orthotropic branches irregularly arranged, and no reiteration evidences; they could represent Attim's model. Reiteration patterns are described for the first time for Jurassic gondwanic conifers, in agreement with observations made in Triassic conifers from Arizona and Jurassic conifers from the United Kingdon. Moreover, we can follow Massart's model from some Upper Palaeozoic Walchiaceae to the Mesozoic Araucariaceae studied in this contribution.
format Objeto de conferencia
Resumen
author Falaschi, Paula
Grosfeld, J.
Foix, N.
Rivera, Stella Maris
author_facet Falaschi, Paula
Grosfeld, J.
Foix, N.
Rivera, Stella Maris
author_sort Falaschi, Paula
title How did Conifers grow in Mesozoic times? : A Jurassic case of growth architecture in Araucariaceae from the La Matilde Formation, Patagonia, Argentina
title_short How did Conifers grow in Mesozoic times? : A Jurassic case of growth architecture in Araucariaceae from the La Matilde Formation, Patagonia, Argentina
title_full How did Conifers grow in Mesozoic times? : A Jurassic case of growth architecture in Araucariaceae from the La Matilde Formation, Patagonia, Argentina
title_fullStr How did Conifers grow in Mesozoic times? : A Jurassic case of growth architecture in Araucariaceae from the La Matilde Formation, Patagonia, Argentina
title_full_unstemmed How did Conifers grow in Mesozoic times? : A Jurassic case of growth architecture in Araucariaceae from the La Matilde Formation, Patagonia, Argentina
title_sort how did conifers grow in mesozoic times? : a jurassic case of growth architecture in araucariaceae from the la matilde formation, patagonia, argentina
publishDate 2010
url http://sedici.unlp.edu.ar/handle/10915/16865
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