Quando Aparece a Primeira Escama? Estudo Comparativo Sobre O Surgimento De Escamas De Absorção Em Três Espécies De Bromélias Terrestres De Restinga

Mantovani, André; Iglesias, Ricardo Rios

doi:10.1590/2175-78602005568705

Cited by 18 publications

(18 citation statements)

References 13 publications

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“…However the absence of terrestrial bromeliad seedlings in restinga suggests that ideal conditions for bromeliad seeds to germinate and/or seedlings to establish are rarely found under field conditions. Bromeliads in restingas present terrestrial forms of the typical epiphytes from the neighboring Atlantic rainforest (Mantovani & Iglesias 2005). A high bromeliad seedling mortality under canopy condition is a well known phenomenon (Benzing 2000) that stimulates the hypothesis that niche separation of bromeliads in canopies could be related to interspecific seedling susceptibility to stressful conditions.…”

Section: Discussionmentioning

confidence: 99%

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The effect of water stress on seed germination of three terrestrial bromeliads from restinga

Mantovani¹,

Iglesias²

2010

Rev. bras. Bot.

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Bromeliad seedlings are rarely found on sandy coastal plains (restinga), limited, probably, by stressful conditions and/or specific abiotic requirements for germination. The effect of water stress on rate, time, synchronicity and spreading of germination was evaluated here for three terrestrial bromeliads from the restinga of Maricá using osmotic solutions of polyethyleneglicol 6000 (PEG 6000), from 0.0 to -0.26 MPa for 30 days. Water stress induced by PEG lowered rate and increased time and synchronicity values, besides the number of daily events of bromeliad seed germination, under water potentials between 0.00 to -0.14 MPa. No seeds germinated under water potentials lower than -0.14 MPa. These results reinforce a constant and/or high moisture requirement for bromeliad seeds to germinate. We conclude that bromeliads are not able to act as pioneer plants through germination outside the vegetation islands of the restinga of Maricá, due to the inability of seeds to germinate under lower water potential.
Plântulas de bromélias são raramente encontradas em restingas, provavelmente limitadas pelas condições abióticas estressantes e/ou requerimentos abióticos específicos para germinação de sementes. Neste trabalho o efeito do estresse hídrico sobre a taxa, tempo, sincronicidade e distribuição dos eventos diários de germinação são avaliados para três bromélias terrestres da restinga de Maricá com uso de soluções osmóticas de polietilenoglicol 6000 (PEG 6000) de 0.0 MPa até -0,26 MPa durante 30 dias. O estresse hídrico induzido por PEG reduziu a taxa e elevou o tempo, os índices de sincronicidade e o número de eventos diários com novas germinações de sementes das bromélias estudadas, para potenciais hídricos entre 0.00 e -0.14 MPa. Não ocorreu germinação sob potenciais hídricos menores que -0,14 MPa. Estes resultados reforçam a hipótese de um requerimento por fornecimento hídrico constante e/ou elevado para germinação de bromélias em condições de campo. Concluímos que as bromélias terrestres não agem como plantas pioneiras através de germinação de sementes nas áreas entre moitas da restinga de Barra de Marica, devido à incapacidade das sementes de germinar em condições de baixo potencial de água

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Section: Discussionmentioning

confidence: 99%

“…All dishes were kept at 27 °C air temperature and exposed to 3.5 µmolm -2 s -1 of PAR (Mantovani & Iglesias 2008). Dishes were observed daily, and the onset of germination was detected by radicle extrusion (Mantovani & Iglesias 2005).…”

Section: Methodsmentioning

confidence: 99%

The effect of water stress on seed germination of three terrestrial bromeliads from restinga

Mantovani¹,

Iglesias²

2010

Rev. bras. Bot.

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“…referindo-se às escamas de Tillandsioideae cita dupla função para essas estruturas: absorção rápida de água e sais minerais, quando úmidas, e redução da transpiração e dos efeitos da insolação, quando secas. Estudos posteriores confirmaram essa função (Benzing et al 1978, Strehl 1983, Varadarajan & Gilmartin 1987, Mantovani & Iglesias 2005.…”

Section: Discussionunclassified

Anatomia e desenvolvimento pós-seminal de espécies de Bromeliaceae (Poales) da Amazônia - MT

Silva¹

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“…The restingas are sandy coastal flatlands of Pleistocene origin (ca. 10,000 years ago), where the species composition and physiognomic structure of the vegetation have a strong relationship to the Cerrado (Pereira & Araujo 2000), and a similar microclimate, which is hotter, dry, and with more intense sunlight than in the adjacent humid forest environments (Mantovani & Iglesias 2005). The Caatinga and dry forests are environments with pronounced hydric seasonality (B. arenaria).…”

Section: Discussionmentioning

confidence: 99%

“…The methodology followed Monteiro et al (2011). Anatomical and macromorphological informations for some nonBromelia species were obtained from published descriptions (Sajo et al 1998;Zizka et al 1999;Forzza 2001;Mantovani & Iglesias 2005;Leme & Siqueira Filho 2006;Mantuano 2008;Mantovani et al 2012). The terminologies adopted follow the definitions of Radford et al (1974) and Weberling (1989) for macromorphology, and Tomlinson (1969) for micromorphology.…”

Section: Taxon Samplingmentioning

confidence: 99%

Morphological Phylogenetic Analysis of Two Early-Diverging Genera of Bromelioideae (Bromeliaceae)

2015

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Bromelia includes 66 species, grouped in three subgenera: Bromelia, Distiacanthus and Karatas. The genus is one of the earlier divergent groups within Bromelioideae, a subfamily with innumerable problems of generic delimitation. Considering that few phylogenetic studies have included more than one species of Bromelia, the objectives of this study were to carry out a phylogenetic analysis for the genus, seeking to evaluate its monophyly as well as its subgenera, and to better understand the interspecific evolutionary relationships within the genus and the intergeneric relationships within Bromelioideae. Also included in the analysis were the two species of Fernseea, a genus originally described from a species placed in Bromelia. The phylogenetic analysis was conducted with combined micro-and macromorphological data, including 39 taxa with 116 characters. As in other studies on Bromeliaceae, the clades have low statistical support and many questions regarding the relationships of the groups remain. The circumscription of Bromelia is still uncertain, due to the position of B. irwinii; Fernseea seems to emerge within this genus, as the marority-rule consensus suggests, and the infrageneric categories are debatable because they do not constitute monophyletic groups. However, Bromelia seems to be paraphyletic and, without B. irwinii, the genus can be considered monophyletic. Beginning with the premise that the most recent common ancestor of Bromelioideae appeared first in the southern Andes, Bromelia and Fernseea seems to have dispersed along three biogeographical routes. The present work is an important contribution to understand the evolution and biogeography of the Bromelioideae.

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Quando Aparece a Primeira Escama? Estudo Comparativo Sobre O Surgimento De Escamas De Absorção Em Três Espécies De Bromélias Terrestres De Restinga

Cited by 18 publications

References 13 publications

The effect of water stress on seed germination of three terrestrial bromeliads from restinga

The effect of water stress on seed germination of three terrestrial bromeliads from restinga

Anatomia e desenvolvimento pós-seminal de espécies de Bromeliaceae (Poales) da Amazônia - MT

Morphological Phylogenetic Analysis of Two Early-Diverging Genera of Bromelioideae (Bromeliaceae)

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