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152 results on '"Teixeira, Simone Pádua"'

14. Morphological insights into the pollen–stigma interaction in Mimosa caesalpiniifoliaBenth. (Leguminosae): exploring the lock-and-key mechanism

Author

Guglielmi, Isabela Fontes and Teixeira, Simone Pádua

Abstract

Mimosa caesalpiniifoliaBenth. is a bee-pollinated legume tree with significant reproductive success which is widely distributed among Brazilian vegetations. Its reproductive success is attributed to an efficient pollen–stigma interaction. Thus, our objective was to understand the pollen–stigma interaction of this species by describing the morphology of the pollen dispersal unit and the stigma. We aimed to identify characteristics that confirm the “key-lock” interaction process, anticipated in species with clustered pollen dispersion, as found in individuals of the Mimoseae tribe. Anthers and stigmas were sampled from unpollinated and pollinated flowers and processed for surface, anatomical, histochemical and ultrastructural analyses. The embryo sacs and seeds produced were counted in the ovaries and pods, respectively. The pollen is dispersed as acalymmate polyads that are symmetric, with a circular outline in polar view and an elliptical outline in front view; the major diameter mesuares 10.9 µm and the minor diameter, 7.8 µm. Each polyad is formed of eight pollen grains that have an areolate-verrucate exine, along with starch grains and protein bodies as reserve substances. The stigma is semidry, punctiform, with a central hole, cuticularized, composed of cells that secrete proteins, polysaccharides, phenolics, and oil. The discovery of eight pollen grains per polyad, with only one polyad deposited on each stigma, along with the presence of eight ovules per ovary, indicates a key-lock mechanism between the stigma and polyad. This mechanism promotes the fertilization of all eight embryo sacs and results in the production of nearly the same quantity of seeds per pod.

Published
2024
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30. Secretory structures of the Adesmia clade (Leguminosae): Implications for evolutionary adaptation in dry environments

Author

Fortuna-Perez, Ana Paula, primary, Marinho, Cristina Ribeiro, additional, Vatanparast, Mohammad, additional, de Vargas, Wanderleia, additional, Iganci, João Ricardo Vieira, additional, Lewis, Gwilym Peter, additional, Cândido, Elisa Silva, additional, de Moura, Tânia Maria, additional, Monteiro, Thiago Cobra e, additional, Miotto, Silvia Teresinha Sfoggia, additional, and Teixeira, Simone Pádua, additional

Published
2021
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37. What makes a fig: insights from a comparative analysis of inflorescence morphogenesis in Moraceae.

Author

Leite, Viviane Gonçalves, Kjellberg, Finn, Pereira, Rodrigo Augusto Santinelo, and Teixeira, Simone Pádua

Subjects
INFLORESCENCES, MORACEAE, MORPHOGENESIS, FIG, MULBERRY, FLOWER arrangements
Abstract

Background and Aims Moraceae, the family of mulberry and fig trees, displays small homogeneous flowers but extremely diverse inflorescences ranging from simple and branched to complex and condensed. Inflorescences also vary in flower organization in the receptacle, in the degree of flower condensation and in receptacle shape. Thus, the objective of the present study was to compare the inflorescence morphogenesis of Moraceae species, to investigate whether clades with a similar pollination mode share the same patterns of inflorescence development and the developmental stages at which we observe the key changes resulting in the diversified inflorescence architecture that culminates in the Ficus syconium. Methods Inflorescences at different developmental stages were sampled from Brosimum gaudichaudii , Castilla elastica , Clarisia ilicifolia , Ficus pertusa , Maclura tinctoria and Morus nigra and processed for surface and anatomical analyses. Key Results The inflorescence morphogenesis of the studied species is highly variable. The shape of the inflorescence meristem (bulging, hemispheric or elongated), the initiation order and arrangement of flowers along the receptacle and the occurrence of bracts vary between related species. This diversity originates early during inflorescence development. Brosimum gaudichaudii , C. elastica and F. pertusa have flowers enclosed or immersed within the receptacle, although inflorescences begin their development as flat and open structures, as occurs in the other three study species. Conclusion Comparison of the inflorescence morphogenesis in Moraceae species allows us to infer that evolutionary ontogenetic changes driven by pollinators culminate in the enclosure of flowers inside the receptacle, as occurs in the Ficus syconium. [ABSTRACT FROM AUTHOR]

Published
2021
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38. Chapter Two: Structural diversity and distribution of laticifers.

Author

Teixeira, Simone Pádua, Marinho, Cristina Ribeiro, and Leme, Flávia Maria

Subjects
*FIG, *PLANT development, *PLANT protection, *PHYTOGEOGRAPHY, *ANATOMY
Abstract

The present chapter deals with the concept as well as the structure, ultrastructure and development of laticifer in plants. The morphological aspects of the laticifer development are used to better support the laticifer current classification. Some general functions attributed to the laticifer are discussed, especially those related to the plant protection. As a novelty we cited a role of laticifer presence and distribution in the pollination of the fig trees. An extensive bibliographic survey on taxonomic distribution of laticifers in plants is presented. Illustrations of anatomy, histochemistry and ultrastructure of laticifers are presented to exemplify the treated aspects. Unpublished or recently published aspects are highlighted in each topic. We showed that there is a great diversity of morphological types of laticifers and developmental processes involving the laticifer formation in plants. [ABSTRACT FROM AUTHOR]

Published
2020
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39. Aluminium detoxification in facultative ( Passovia ovata (Pohl ex DC.) Kuijt and Struthanthus polyanthus Mart. - Loranthaceae) and dependent ( Psittacanthus robustus (Mart.) Marloth - Loranthaceae) Al-accumulating mistletoe species from the Brazilian savanna

Author

de Souza, Marcelo Claro, primary, Scalon, Marina Corrêa, additional, Poschenrieder, Charlotte, additional, Tolrà, Roser, additional, Venâncio, Tiago, additional, Teixeira, Simone Pádua, additional, and Da Costa, Fernando Batista, additional

Published
2018
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