Consulta: subjectFacets:"Araucariaceae"
Registros recuperados: 11
Data/hora: 09/06/2024 10:55:24

Patterns of genetic diversity in southern and southeastern Araucaria angustifolia (Bert.) O. Kuntze relict populations
Provedor de dados: 74
Autores: Souza,Maria Isabel Ferreira de; Salgueiro,Fabiano; Carnavale-Bottino,Mariana; Félix,Durvalina Benedita; Alves-Ferreira,Marcio; Bittencourt,Juliana Vitoria Messias; Margis,Rogério.
Habitat fragmentation and a decrease in population size may lead to a loss in population genetic diversity. For the first time, the reduction in genetic diversity in the northernmost limit of natural occurence (southeastern Brazil) of Araucaria angustifolia in comparison with populations in the main area of the species continuous natural distribution (southern Brazil), was tested. The 673 AFLPs markers revealed a high level of genetic diversity for the species (Ht = 0.27), despite anthropogenic influence throughout the last century, and a decrease of H in isolated populations of southeastern Brazil (H = 0.16), thereby indicating the tendency for higher genetic diversity in remnant populations of continuous forests in southern Brazil, when compared to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Araucariaceae; Relict populations; Araucaria forest; Population genetics; AFLP.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000300018

Status of Agathis flavescens (Araucariaceae) in Peninsular Malaysia
Provedor de dados: 16
Autores: Lim, C.L.
The narrowly endemic species Agathis flavescens Ridl., known only from altitudes between 1100 and 2100 m on Gunung Tahan and Gunung Rabong, Peninsular Malaysia, is reinstated as a distinct species.
Tipo: Article / Letter to the editor
Palavras-chave: Araucariaceae; Agathis; Gunung Tahan; Peninsular Malaysia.
Ano: 2007
URL: http://www.repository.naturalis.nl/record/525697

Leaf anatomy of Araucaria angustifolia (Bertol.) Kuntze (Araucariaceae)
Provedor de dados: 88
Autores: Mastroberti,Alexandra A.; Mariath,Jorge E.A.
Immature and mature leaves of juvenile and adult plants of Araucaria angustifolia (Araucariaceae) were observed with the objective of updating the morphoanatomical data of the leaves of this species, which were restricted to basic descriptions in previous studies. The observations, made in optical allowed to establish anatomical differences among mature leaves of juvenile and adult plants in relation to the number of palisade parenchimal layers, the number of compartmented cells and the transfusion tissue development. Epidermis, the albuminous cells, the phloem, and the transfusion tissue descriptions are in disagreement with the data obtained data by different authors. The epidermal tissue and the hypodermis differ entirely when the plant is still...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Araucaria angustifolia; Araucariaceae; Leaf anatomy.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042003000300007

Branch whorls of juvenile Araucaria araucana (Molina) Koch: are they formed annually?
Provedor de dados: 97
Autores: LUSK,CHRISTOPHER H.; LE-QUESNE,CARLOS.
The growth of Araucaria araucana, like that of many other conifers, is characterised by the production of a monopodial stem with branch whorls. However, the periodicity of whorl formation in this species has not been subjected to systematic study. We used growth ring counts to determine the frequency of whorl formation in sun- and shade-grown juvenile A. araucana in a montane forest in the Chilean coast range. Whorls were not annual in any of the 35 individuals studied, growth rings outnumbering whorls by a factor of 1.8 to 3.9. The mean interval between successive whorls was significantly shorter in sun-grown (2.1 yrs whorl -1) than in shade-grown trees (2.6 yrs whorl-1), suggesting a relationship with plant carbon balance. Mean distance between whorls...
Tipo: Journal article
Palavras-chave: Araucariaceae; Conifers; Dendroecology; Tree growth; Tree rings.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000300013

In vitro establishment of araucaria (Araucaria angustifolia) stem segments
Provedor de dados: 22
Autores: Pereira, Mariane de Oliveira; Navroski, Marcio Carlos; Silveira Reiniger, Lia Rejane; Teixeira, Debora da Silva; Missio, Francieli de Fatima; Tonett, Erasmo Luis.
Araucaria angustifolia is a species of high economic value, timber, food and to resin but have problems concerning propagation by seed due to the low viability of propagules. The micropropagation may be an alternative for producing seedlings of good quality. The present study evaluated the in vitro establishment of stem segments of A. angustifolia collected in three different positions and in different shifts in culture media and their dilutions. After 60 days of sowing in plastic trays held excision of stem segments of approximately 2-3 cm in length. The experiment was conducted in a completely randomized design, using a 3 x 4 factorial scheme, in which the levels of factor "A" referred to the different collection positions and levels of the factor "B",...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Araucariaceae; Cultura de tecidos; Micropropagação; Pinheiro-brasileiro; Silvicultura de nativas.
Ano: 2014
URL: http://e-revista.unioeste.br/index.php/scientiaagraria/article/view/7845

Changes of wood anatomical characters of selected species of Araucaria- during artificial charring - implications for palaeontology
Provedor de dados: 39
Autores: Osterkamp,Isa Carla; Lara,Daniela Müller de; Gonçalves,Thaís Alves Pereira; Kauffmann,Marjorie; Périco,Eduardo; Stülp,Simone; Machado,Neli Teresinha Galarce; Uhl,Dieter; Jasper,André.
ABSTRACT Charcoal is widely accepted as evidence of the occurrence of palaeo-wildfire. Although fossil charcoal remains have been used in many studies, investigation into the anatomical changes occurring during charring are few. The present study analyses changes in selected anatomical characters during artificial charring of modern wood of three species of the genus Araucaria (i.e. Araucaria angustifolia, Araucaria bidwillii and Araucaria columnaris). Wood samples of the studied species was charred under controlled conditions at varying temperatures. Measurements of anatomical features of uncharred wood and artificial charcoal were statistically analysed. The anatomical changes were statistically correlated with charring temperatures and most of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anatomy; Araucariaceae; Araucaria angustifolia; Araucaria bidwillii; Araucaria columnaris; Charcoal; Wood.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062018000200198

Comparison of seedling growth among three co-occurring varieties of Araucaria angustifolia (Bertol.) Kuntze under greenhouse conditions
Provedor de dados: 39
Autores: Coutinho,André Luiz; Dillenburg,Lúcia Rebello.
Araucaria angustifolia (Bertol.) Kuntze is a tall, long-lived tree species, which grows as an emergent tree in the araucaria forests of southern Brazil. Four varieties have been described for this species, and three of them were selected for this study: "angustifolia" (the type variety), "caiova" and "indehiscens". These are co-occurring varieties that differ in external seed color and timing of seed maturation. The purpose of this study was to compare the initial growth of plants originated from seeds of these three varieties, in order to test the hypothesis that these varieties also differ in the initial growth of their seedlings. Seeds were collected from a single forest location, and 60 plants per variety were grown in pots for a period of 244 days....
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Araucariaceae; Brazilian pine; Monkey pine; Caiova pine; Phenotypic variation.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062010000200025

A new araucarian fossil species from the Paleogene of southern Argentina
Provedor de dados: 41
Autores: Panti,Carolina; Césari,Silvia N.; Marenssi,Sergio A.; Olivero,Eduardo B.
A new Araucariaceaea from the Paleogene of Tierra del Fuego Province, Argentina is described. Araucaria pararaucana sp. nov. has imbricate, ovate-lanceolate leaves with an acute apex, characterized by the presence of discontinuous and longitudinally oriented stomatal rows separated by epidermal cells, which may be slightly sinuous. Stomatal guard cell surface is granular. These fossil leaves are compared with the extant sections Bunya, Intermedia and Araucaria. Their anatomical characters along with the external morphology suggest a close affinity with the extant southern Patagonian species A. araucana (Molina) K. Koch. The record of this new late Eocene species provides more evidence for a probable unique representation of Section Araucaria in the area...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gymnosperms; Araucariaceae; Araucaria; Cuticle; Paleogene; Argentina.
Ano: 2007
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142007000100016

Morphology and structure of the pollen cone and pollen grain of the Araucaria species from Argentina
Provedor de dados: 47
Autores: Fueyo,Georgina M. del; Caccavari,Marta A.; Dome,Elizabeth A.
The pollen cone and the pollen grain of the two Argentinean species of Araucaria are described with LM, SEM and TEM. Primordia of pollen cones are formed in April and May and reach maturity by mid-October in A. angustifolia (Bert.) O. Kuntze and by mid-November in A. araucana. (Mol.) K. Koch. Characters of the mature pollen cones and microsporophylls between both taxa are clearly differentiated. Pollen grains are spheroidal-subspheroidal, inaperturate, and asaccate with granulate exine and a subequatorial annular area that corresponds to the sexine thickness. Sculpturing consists of irregularly dispersed granules that are sometimes fused to each other (A. angustifolia) or forming microrugulae (A. araucana). Microgranules and microspinules are also present....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Araucariaceae; Araucaria; Pollen cones; Pollen ultrastructure.
Ano: 2008
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452008000100006

Biochemical and morphological changes during the growth kinetics of Araucaria angustifolia suspension cultures
Provedor de dados: 52
Autores: Santos,André Luis Wendt dos; Silveira,Vanildo; Steiner,Neusa; Maraschin,Marcelo; Guerra,Miguel Pedro.
Embryogenic cultures of Araucaria angustifolia were established in a BM liquid medium supplemented with 2 µM 2,4-dichlorophenoxyacetic acid, 1 µM 6-benzylaminopurine and 1 µM kinetin (BM2) and in a BM medium free of growth regulators (BM0). During 42 days in culture, the cell growth pattern of both cultures was similar. The pH of the culture medium of both BM0 and BM2 underwent progressive reduction during culture time. For both the embryogenic cultures a preferential uptake of glucose in the late stages of cell growth kinetics was observed. The extracellular protein content was similar for both the embryogenic cultures. Acetocarmine and Evan's blue double stain showed major differences for early somatic embryo organisation, in which only the embryogenic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Araucariaceae; Glucose; PH changes; Protein; Somatic embryogenesis.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132010000300001

Effects of different nitrogen sources on growth, chlorophyll concentration, nitrate reductase activity and carbon and nitrogen distribution in Araucaria angustifolia
Provedor de dados: 61
Autores: Garbin,Mário L.; Dillenburg,Lúcia R.
The southern Brazilian highland plateau is a mosaic of two contrasting plant communities, Araucaria forests and grasslands, which differ in the relative abundances and spatial patterns of soil nitrate and ammonium. However, we still do not know the inorganic N preferences of one key species in this mosaic, Araucaria angustifolia, the dominant tree species in the Araucaria forests and an important tree species invading the adjacent grasslands. Growth responses measured in a greenhouse study demonstrated that the species prefers NH4+ over NO3- as an inorganic N source. When provided alone, NO3- induced N deficiency symptoms: increases in root: shoot ratio, root branching and leaf mass per area, thickening of the shoot apexes and decreased mass-based...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Araucariaceae; Ammonium; Inorganic nitrogen; Nitrate; Nitrogen deficiency.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202008000400005