Caracterização anatômica foliar para 14 espécies de Xyris L. (Xyridaceae) da Serra do Cipó, MG, Brasil

Sajo, Maria das Graças; Wanderley, Maria das Graças Lapa; Carvalho, Luciana Marques de

doi:10.1590/s0102-33061995000100004

Cited by 14 publications

(16 citation statements)

References 2 publications

(2 reference statements)

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“…The evergreen unifacial leaves are covered by one layered epidermis (Sajo et al, 1995) cells presented condensed phenolic compounds in X. pterygoblephara, X. tortilis, X. obcordata and X. hymenachne, (Fig. 1-3, 6 arrow), as reported for Eragrostis racemosa from dry habitats (Theunissen & Jordan, 1990).…”

Section: Resultssupporting

confidence: 67%

“…Although pectic compounds were not specifically associated with drought stress, their generalized occurrence in Xyris leaves suggested that the species were able to store small amounts of water avoiding the drought stress they were exposed to during the winter. In all studied species, the mesophyll showed a palisade tissue close to the surface and spongy parenchyma in the center (Sajo et al, 1995). Some chlorenchyma cells were approximately cylindrical in shape, with undulant lateral walls forming alternate inward and outward folds.…”

Section: Resultsmentioning

confidence: 93%

“…Xyris leaves have an ensiform unifacial blade that develops by an extensive activity of the adaxial meristem (Sajo & Rudall, 1999). The thick blades vary from ensiform to cylindrical and show fused vascular bundles surrounded by sclerenchymatous cells (Sajo, 1992, Sajo et al, 1995, Sajo & Wanderley, 1998.…”

Section: Introductionmentioning

confidence: 99%

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Submicroscopical Features of Leaves of Xyris Species

Sajo

Machado

2001

Braz. arch. biol. technol.

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Section: Resultssupporting

confidence: 67%

Section: Resultsmentioning

confidence: 93%

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Submicroscopical Features of Leaves of Xyris Species

Sajo

Machado

2001

Braz. arch. biol. technol.

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“…Examples are the works of Nyffeler & Eggli (2000) on the shoot and Wege (2001) on the scape. In relation to the leaf, both petiole and leaf lamina outline in cross section have already been applied to the diagnosis of plant species (Metcalfe & Chalk 1950, Leo et al 1997, Sajo et al 1995.…”

Section: Discussionmentioning

confidence: 99%

Leaf midrib outline as a diagnostic character for taxonomy in Anthurium section Urospadix subsection Flavescentiviridia (Araceae)

Mantovani

Pereira

Coelho

2009

Hoehnea

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-(Leaf midrib outline as a diagnostic character for taxonomy in Anthurium section Urospadix subsection Flavescentiviridia (Araceae)). The external morphology of the midrib of the leaf lamina is used as a diagnostic character for the taxonomy of species of Anthurium subsection Flavescentiviridia (section Urospadix) (Araceae). Our aims in this study are: characterize using morphological analysis the variation of the outline of the midrib along the leaf lamina using 22 of the 35 species of the subsection; evaluate the potential of this variation as a diagnostic tool for taxonomy. For each species, the leaf lamina was divided into three pieces of identical length. The median point of each region was transversely sectioned and its outline drawn with the aid of a camera lucida and microscope. Five distinct types of outlines were classifi ed using current terminology. Considering the diffi culty of diagnosing many of the species, this character could be useful for the taxonomy of this subsection.

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“…Tais características podem proteger folhas, brácteas e escapos contra a transpiração e luminosidade excessivas, além de funcionarem como suporte mecânico contra a ação dos ventos, que são constantes (Scatena & Menezes 1996), estando presentes também em folhas de outras famílias representativas de campos rupestres, como Compositae (Handro et al 1970, Sajo & Menezes 1994, Velloziaceae (Mello-Silva 1990), Iridaceae (Chueiri-Chiaretto 1984) e Xyridaceae (Sajo et al 1995).…”

Section: Discussionunclassified

Anatomia das folhas, brácteas e escapos de Actinocephalus (Koern.) Sano (Eriocaulaceae)

2005

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-(Anatomy of the leaves, bracts and scapes of Actinocephalus (Koern.) Sano (Eriocaulaceae)). The anatomy of the leaves, bracts and scapes of 20 species (41 specimens) of Actinocephalus from the "campos rupestres" of Brazil were studied. Our aim was the characterization of this new genus in an anatomical basis, besides elucidating some ecological aspects of the group. The leaves and bracts are similar, presenting an uniseriate epidermis, with elongated cells in longitudinal orientation; stomata on the abaxial surface, with substomatal chambers; loosely aggregated chlorenchyma; collateral vascular bundles enclosed in a double sheath, and parenchymatous bundles sheath extensions. The scapes present an uniseriate epidermis; substomatal chambers; loosely aggregated chlorenchyma; discontinuous endodermis; sinuous pericycle and collateral vascular bundles. The presence of elongated cells in longitudinal orientation in the epidermis as well as in the vascular bundles sheath extensions in the leaves and bracts, besides discontinuous endodermis in the scapes and substomatal chambers in the three organs studied are consistent characters for the genus. The anatomical characteristics of the organs studied are mesomorphic.Key words -Actinocephalus, anatomy, bracts, leaves, scapes RESUMO -(Anatomia das folhas, brácteas e escapos de Actinocephalus (Koern.) Sano (Eriocaulaceae)). Estudou-se a anatomia das folhas, brácteas e escapos de 20 espécies (41 espécimes) de Actinocephalus, que ocorrem nos campos rupestres do Brasil, visando caracterizar anatomicamente o novo gênero proposto para a família, além de elucidar alguns aspectos ecológicos do grupo. As folhas e as brácteas são anatomicamente semelhantes entre si e apresentam epiderme unisseriada, com células alongadas no sentido longitudinal; estômatos na face abaxial, com câmaras subestomáticas; parênquima clorofiliano frouxo; feixes vasculares colaterais envolvidos por bainha dupla e extensão de bainha dos feixes constituída por células parenquimáticas alongadas. Os escapos apresentam epiderme unisseriada; câmaras subestomáticas; parênquima clorofiliano frouxo; endoderme descontínua; periciclo sinuoso e feixes vasculares colaterais. A presença de células alongadas tanto na epiderme como nas extensões de bainha dos feixes vasculares nas folhas e nas brácteas, assim como endoderme descontínua nos escapos e câmara subestomática nos três órgãos estudados são caracteres consistentes para o gênero. As características anatômicas dos órgãos estudados são mesomórficas.

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Caracterização anatômica foliar para 14 espécies de Xyris L. (Xyridaceae) da Serra do Cipó, MG, Brasil

Cited by 14 publications

References 2 publications

Submicroscopical Features of Leaves of Xyris Species

Submicroscopical Features of Leaves of Xyris Species

Leaf midrib outline as a diagnostic character for taxonomy in Anthurium section Urospadix subsection Flavescentiviridia (Araceae)

Anatomia das folhas, brácteas e escapos de Actinocephalus (Koern.) Sano (Eriocaulaceae)

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