Bark anatomy of three indigenous conifers from southern South America

This paper describes the bark anatomy of three native conifers from southern South America, Podocarpus nubigena Lindl., Saxegothaea conspicua Lindl. (Podocarpaceae) and Araucaria araucana (Mol.) K.Koch. (Araucariaceae). The bark colours of these three conifers are greyish-brown, reddish-brown and tr...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Castro, M.A., Apóstolo, N.M., Navarro, L.E.
Formato: JOUR
Materias:
anatomy
bark
coniferous tree
South America
Araucaria araucana
Araucariaceae
Coniferophyta
Podocarpaceae
Podocarpus nubigenus
Saxegothaea conspicua
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00671924_v54_n1_p73_Castro
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00671924_v54_n1_p73_Castro
record_format dspace
spelling todo:paper_00671924_v54_n1_p73_Castro2023-10-03T14:53:11Z Bark anatomy of three indigenous conifers from southern South America Castro, M.A. Apóstolo, N.M. Navarro, L.E. anatomy bark coniferous tree South America Araucaria araucana Araucariaceae Coniferophyta Podocarpaceae Podocarpus nubigenus Saxegothaea conspicua This paper describes the bark anatomy of three native conifers from southern South America, Podocarpus nubigena Lindl., Saxegothaea conspicua Lindl. (Podocarpaceae) and Araucaria araucana (Mol.) K.Koch. (Araucariaceae). The bark colours of these three conifers are greyish-brown, reddish-brown and true brown, respectively. Morphologically, the bark of S. conspicua is scaly whereas it is fissured in A. araucana and P. nubigena. Fissures are relatively shallow in P. nubigena and relatively deep in A. araucana. The latter two species have elongated stripes and polygonal to irregular plates, respectively. Anatomically, P. nubigena shows a gradual transition between non-collapsed and collapsed phloem. This species shows secondary phloem cells regularly arranged in continuous tangential bands composed of alternating sieve cells, axial parenchyma and fibres. In A. araucana the ordered pattern observed in the non-collapsed secondary phloem is lost in the collapsed phloem. All three species show homocellular and uniseriate rays exhibiting a sinuous trajectory in the collapsed phloem and into the rhytidome. Fibres in P. nubigena are arranged in narrow, tangentially uniseriate lines. Sclereids are observed in S. conspicua whereas ramified sclereids and fibres are present in A. araucana. Minute cell-wall crystals in the fibres are exhibited in all species. The persistent rhytidome occupies a variable proportion of the bark. A. araucana shows thick periderms and rhytidome, with indistinct rays in dead phloem. Starch, tannins and resins are frequent in parenchyma. Secretory canals are present only in A. araucana. In summary, the external morphology, arrangement of axial parenchyma, type of the sclerenchymatous tissue, presence of secretory canals and cell-wall crystals are the most important features that can be used for identification when other diagnostic plant parts are missing. © CSIRO 2006. Fil:Castro, M.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Apóstolo, N.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00671924_v54_n1_p73_Castro
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic anatomy
bark
coniferous tree
South America
Araucaria araucana
Araucariaceae
Coniferophyta
Podocarpaceae
Podocarpus nubigenus
Saxegothaea conspicua
spellingShingle anatomy
bark
coniferous tree
South America
Araucaria araucana
Araucariaceae
Coniferophyta
Podocarpaceae
Podocarpus nubigenus
Saxegothaea conspicua
Castro, M.A.
Apóstolo, N.M.
Navarro, L.E.
Bark anatomy of three indigenous conifers from southern South America
topic_facet anatomy
bark
coniferous tree
South America
Araucaria araucana
Araucariaceae
Coniferophyta
Podocarpaceae
Podocarpus nubigenus
Saxegothaea conspicua
description This paper describes the bark anatomy of three native conifers from southern South America, Podocarpus nubigena Lindl., Saxegothaea conspicua Lindl. (Podocarpaceae) and Araucaria araucana (Mol.) K.Koch. (Araucariaceae). The bark colours of these three conifers are greyish-brown, reddish-brown and true brown, respectively. Morphologically, the bark of S. conspicua is scaly whereas it is fissured in A. araucana and P. nubigena. Fissures are relatively shallow in P. nubigena and relatively deep in A. araucana. The latter two species have elongated stripes and polygonal to irregular plates, respectively. Anatomically, P. nubigena shows a gradual transition between non-collapsed and collapsed phloem. This species shows secondary phloem cells regularly arranged in continuous tangential bands composed of alternating sieve cells, axial parenchyma and fibres. In A. araucana the ordered pattern observed in the non-collapsed secondary phloem is lost in the collapsed phloem. All three species show homocellular and uniseriate rays exhibiting a sinuous trajectory in the collapsed phloem and into the rhytidome. Fibres in P. nubigena are arranged in narrow, tangentially uniseriate lines. Sclereids are observed in S. conspicua whereas ramified sclereids and fibres are present in A. araucana. Minute cell-wall crystals in the fibres are exhibited in all species. The persistent rhytidome occupies a variable proportion of the bark. A. araucana shows thick periderms and rhytidome, with indistinct rays in dead phloem. Starch, tannins and resins are frequent in parenchyma. Secretory canals are present only in A. araucana. In summary, the external morphology, arrangement of axial parenchyma, type of the sclerenchymatous tissue, presence of secretory canals and cell-wall crystals are the most important features that can be used for identification when other diagnostic plant parts are missing. © CSIRO 2006.
format JOUR
author Castro, M.A.
Apóstolo, N.M.
Navarro, L.E.
author_facet Castro, M.A.
Apóstolo, N.M.
Navarro, L.E.
author_sort Castro, M.A.
title Bark anatomy of three indigenous conifers from southern South America
title_short Bark anatomy of three indigenous conifers from southern South America
title_full Bark anatomy of three indigenous conifers from southern South America
title_fullStr Bark anatomy of three indigenous conifers from southern South America
title_full_unstemmed Bark anatomy of three indigenous conifers from southern South America
title_sort bark anatomy of three indigenous conifers from southern south america
url http://hdl.handle.net/20.500.12110/paper_00671924_v54_n1_p73_Castro
work_keys_str_mv AT castroma barkanatomyofthreeindigenousconifersfromsouthernsouthamerica
AT apostolonm barkanatomyofthreeindigenousconifersfromsouthernsouthamerica
AT navarrole barkanatomyofthreeindigenousconifersfromsouthernsouthamerica
_version_ 1807319712500023296

Ejemplares similares