Maria das Graças Sajo

ORCID: 0000-0003-4642-8769
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About
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Research Areas
  • Plant Diversity and Evolution
  • Plant and animal studies
  • Fern and Epiphyte Biology
  • Plant and Fungal Species Descriptions
  • Plant Taxonomy and Phylogenetics
  • Plant Parasitism and Resistance
  • Botanical Research and Applications
  • Growth and nutrition in plants
  • Genetic and rare skin diseases.
  • Mediterranean and Iberian flora and fauna
  • Legume Nitrogen Fixing Symbiosis
  • Optical Coherence Tomography Applications
  • Plant Reproductive Biology
  • Dermatologic Treatments and Research
  • Tree Root and Stability Studies
  • Plant tissue culture and regeneration
  • Geography and Environmental Studies
  • Sugarcane Cultivation and Processing
  • Seed Germination and Physiology
  • Plant responses to water stress
  • Plant Molecular Biology Research
  • Polysaccharides and Plant Cell Walls
  • Banana Cultivation and Research
  • Plant and Biological Electrophysiology Studies
  • Plant Pathogens and Fungal Diseases

Universidade Estadual Paulista (Unesp)
2008-2021

Royal Botanic Gardens, Kew
1999-2010

Universidade de São Paulo
1994-2010

Universidade Federal do Rio Grande do Sul
2007

Instituto de Botânica
2005

Abstract Extrafloral nectaries are nectar‐secreting structures that especially common among the woody flora of Brazilian cerrado , a savanna‐like vegetation. In this study, we provide morphological and anatomical descriptions extrafloral (EFNs) occurring on vegetative reproductive organs several plant species from discuss their function ecological relevance. We describe morphology anatomy EFNs 40 belonging to 15 families using scanning electron microscopy light microscopy. categorise...

10.1111/j.1438-8677.2008.00068.x article EN Plant Biology 2008-06-02

Visando apontar características inerentes à família Bromeliaceae e indicar possíveis adaptações anatômicas encontradas nas espécies de cerrado, foram estudadas as folhas cinco Bromelioideae, sete Tillandsioideae uma Pitcairnioideae. Em geral, os estômatos estão aprofundados na epiderme verifica-se um tecido mecânico epidérmico subepidérmico; observa-se parenquimático armazenador água, células esclerificadas não relacionadas aos tecidos vasculares, além canais aeração percorrendo...

10.1590/s0102-33062007000300013 article PT cc-by Acta Botanica Brasilica 2007-09-01

Foi estudada a estrutura foliar de 22 espécies Melastomataceae (tribos Miconieae, Tibouchinieae e Microlicieae) encontradas no cerrado do estado São Paulo. Em todos os representantes, as folhas são dorsiventrais hipostomáticas nervura principal é formada por xilema floema nas duas faces (exceto uma única espécie). Determinados caracteres presentes nesses órgãos, como tipo posição dos estômatos aspecto das superfícies adaxial abaxial, na região da principal, variam consideravelmente dentro um...

10.1590/s0100-84042005000300004 article PT Revista Brasileira de Botânica 2005-09-01

The grass subfamily Anomochlooideae is phylogenetically significant as the sister group to all other grasses. Thus, comparison of their structure with that grasses could provide clues evolutionary origin these characters.We describe structure, embryology, and development flower partial inflorescence monotypic Brazilian Anomochloa marantoidea. We compare features those early-divergent such Pharus Streptochaeta closely related Poales Ecdeiocolea.Anomochloa possesses several are characteristic...

10.3732/ajb.1100290 article EN American Journal of Botany 2012-03-22

O mesofilo é formado por parênquima lacunoso e os feixes vasculares, maiores menores, se dispõem intercaladamente, nas folhas de Orchidaceae estudadas (Catasetum fimbriatum Lindl., Dichaea bryophila Rchb. f., Encyclia calamaria (Lindl.) Pabst, Epidendrum campestre E. secundum Jacq., Miltonia flavescens Pleurothallis smithiana Stanhopea lietzei (Regel) Schltr. Vanda tricolor Lindl.). No quase todas as espécies ocorrem células esclerificadas adjacentes à epiderme, duas faces foliares. Também...

10.1590/s0100-84041999000300003 article PT Revista Brasileira de Botânica 1999-12-01

Flower anatomy, embryology, and seed anatomy are described for some Brazilian species of Xyris section Nematopus reviewed with respect to the systematic position allied taxa in Commelinanae. Apart from tenuinucellate ovules (shared Poales, Mayaca, Eriocaulaceae), lacks synapomorphies other genera that sometimes included Xyridaceae (Aratitiyopea, Achlyphila, Abolboda, Orectanthe), such as inaperturate spinulate pollen; has monosulcate reticulate pollen. There is an unusual degree variation...

10.1086/314162 article EN International Journal of Plant Sciences 1999-07-01

A detailed study of floral ontogeny, anatomy, and embryology in two (of six) species Pharus is presented as part a series comparative investigations on early‐divergent grasses. taxonomically isolated genus belonging to the earliest‐diverging grass lineage with true spikelet. It unusual possessing remarkably dimorphic florets: male florets possess lodicules, six stamens, pistillode, whereas female lack lodicules entirely but staminodes tricarpellary ovary three stigmas. The rudimentary are...

10.1086/509790 article EN International Journal of Plant Sciences 2007-02-01

The foliar structure of 44 species Myrtoideae Nied. (Myrtaceae) was described to characterise the anatomy leaves in this subfamily and also recognise particular features each genus and/or subtribe. In present study, nine genera subtribe Myrtinae, five Myrciinae eight Eugeniinae were examined. All them have dorsiventral hypostomatic leaves, with stomata slightly protruded relation other epidermal cells; secretory cavities, idioblasts containing druses vascular bundles phloem on both adaxial...

10.1071/bt07176 article EN Australian Journal of Botany 2009-01-01

ABSTRACT The anatomy of rhizomes and roots 14 species Bromeliaceae that occur in the cerrado biome were studied with aim pointing out particular anatomical features family possible adaptations related to environment. All are similar although some have root regions growing inside cortex. In vascular cylinder rhizome is clearly limited from also very similar, coating tissue differs or externally it cortex has a variable organization according region. present associated water absorption...

10.1590/2175-7860200859106 article EN Rodriguésia 2008-01-01

O estudo da estrutura foliar de Aechmea bromeliifolia (Rudge) Baker, A. distichantha Lem., ornata nudicaulis (L.) Griseb., pectinata coelestis (K. Koch) E. Morren, cylindrata Lindm. e gracilis mostrou que, em todas as espécies, folhas são hipoestomáticas revestidas por células epidérmicas paredes sinuosas portadoras corpos silicosos. Apresentam também hipoderme mecânica aqüífera, escamas nas duas superfícies canais aeração, interrompidos diafragmas braciformes, no parênquima clorofiliano. A...

10.1590/s0102-33062004000200011 article PT cc-by Acta Botanica Brasilica 2004-06-01

Foram estudados o pecíolo e a vascularização foliar de 22 espécies Melastomataceae do cerrado Estado São Paulo. A análise da mostrou que, embora venação acródroma seja constante para todos os representantes, determinados caracteres, como tipo aréola, relação entre número nervuras primárias secundárias, última marginal organização rede nervuras, são úteis na delimitação das tribos gêneros estudados. O estudo anatômico também revelou que aspectos, contorno órgão, distribuição dos feixes...

10.1590/s0102-33062004000400029 article PT cc-by Acta Botanica Brasilica 2004-12-01

Bromeliaceae possess several features of pollen and anther wall development that are plesiomorphic for Poales, consistent with their putatively basal or near‐basal placement in this order. For example, successive microsporogenesis the monocotyledonous type formation both occur commonly other a few notable exceptions, notably simultaneous Rapateaceae. The intermediate tapetum was probably derived secondarily from secretory type, which occurs most Poales except Typhaceae.

10.1080/00173130510010503 article EN Grana 2005-06-01

New data on floral morphology, development, and vasculature in two Brazilian genera of the monocot family Velloziaceae (Pandanales) are used to explore homologies their unusual structures, especially corona Barbacenia corona‐like appendages multiple stamens some Vellozia species. All have epigynous flowers. Some species polyandrous, stamen number can be variable within In jolyi, there is a single opposite each sepal fascicle (of three secondary stamens) petal. Each possesses vascular bundle,...

10.1086/653132 article EN International Journal of Plant Sciences 2010-06-22

Considering that the root structure of Brazilian genera belonging to Catasetinae subtribe is poorly known, we describe roots twelve representatives from this subtribe. For anatomical analysis, were fixed in FAA 50, preserved ethanol 70% and sectioned at its medium region using razor blades. The sections stained with 0.05% astra blue safranin mounted glycerin. identification starch used Lugol's solution; for lignin, floroglucin chloridric; lipids, Sudan III, flavanoids, potassium hydroxide....

10.1590/s0001-37652012005000028 article EN cc-by Anais da Academia Brasileira de Ciências 2012-04-25

Com o objetivo de colaborar na delimitação taxonômica Aechmea, subgênero Lamprococcus, foram estudadas as folhas 25 táxons morfologicamente relacionados entre si (13 três Ronnbergia E. Morren & André, quatro Araeococcus Brongn. e cinco Lymania Read). Apesar das serem todas hipoestomáticas possuírem mesofilo dorsiventral portador hipoderme, elas exibem características que podem ser utilizadas cada representante. Essas incluem: posição dos estômatos superfície foliar, presença ou não oclusão...

10.1590/s0100-84042003000400005 article PT Revista Brasileira de Botânica 2003-12-01

Several leaf anatomical features are potentially systematically informative within both the family Vochysiaceae and order Myrtales, notably tracheoidal idioblasts, mucilage cells secretory canals. Tracheoids with spiral wall thickenings present in mesophyll of most species Vochysia, also occur several other families Myrtales. Mucilage common epidermis some Vochysiaceae. Secretory ducts midrib Salvertia which apparently closely related, although shares characters Qualea Callisthene....

10.1046/j.1095-8339.2002.00025.x article EN Botanical Journal of the Linnean Society 2002-03-01

Com o objetivo de reconhecer caracteres vegetativos que auxiliem na identificação Myrtaceae, foram estudadas as folhas 17 espécies Eugenia, presentes da bacia do Rio Tibagi, PR. Analisando os padrões nervação das lâminas e características bainha perivascular, região pecíolo, foi possível separar essas em três grupos distintos. O padrão camptódromo-broquidódromo ocorre nove espécies; acródromo quatro e, nas restantes, observa-se um misto. A perivascular pecíolo pode ser natureza...

10.1590/s0100-84042004000100006 article PT Revista Brasileira de Botânica 2004-03-01

Com o objetivo de caracterizar padrão nervação foliar na subfamília Myrtoideae Nied. (Myrtaceae) bem como reconhecer caracteres particulares a cada subtribo, foram estudadas as folhas 44 espécies, pertencentes às subtribos Myrtinae (nove gêneros), Myrciinae (cinco gêneros) e Eugeniinae (oito gêneros). Foi observado que, embora camptódromo-broquidódromo seja dominante entre misto acródromo-broquidódromo também se encontra presente. Para uma das espécies foi descrito secundário nervação,...

10.1590/s0102-33062006000300016 article PT cc-by Acta Botanica Brasilica 2006-09-01

We examined the embryological development of anthers and ovules from Astraea ( A . lobata praetervisa ) Croton C floribundus , fuscescens glandulosus lundianus piptocalyx urucurana triqueter focusing on features with systematic significance for group. Some these are common in Euphorbiaceae including: a dicotyledonous type anther wall formation, secretory tapetum, mixed origin outer ovule integument, an epidermal inner occurrence many archesporial cells inside megagametophyte Polygonum ‐type....

10.1111/j.1756-1051.2011.01072.x article EN Nordic Journal of Botany 2011-08-01
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