Water absorption and dormancy-breaking requirements of physically dormant seeds of Sophora tomentosa L. and Erythrina speciosa Andr. (Fabaceae-Faboideae)

Water absorption and dormancy-breaking requirements of physically dormant seeds of Sophora tomentosa L. and Erythrina speciosa Andr. (Fabaceae-Faboideae)

Water absorption and dormancy-breaking requirements of physically dormant seeds of Sophora tomentosa L. and Erythrina speciosa Andr. (Fabaceae-Faboideae) Carolina Maria Luzia Delgado1, Alexandre Souza de Paula2, Marisa Santos3 and Maria Terezinha Silveira Paulilo4 1-Departamento de Botânica, Univers...

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Main Authors: Luzia Delgado, Carolina Maria, Souza de Paula, Alexandre, Santos, Marisa, Silveira Paulilo, Maria Terezinha
Format: Online
Language:eng
Published: Universidad de Costa Rica 2015
Online Access:https://revistas.ucr.ac.cr/index.php/rbt/article/view/13903
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institution Universidad de Costa Rica
collection Revista de Biología Tropical
language eng
format Online
author Luzia Delgado, Carolina Maria
Souza de Paula, Alexandre
Santos, Marisa
Silveira Paulilo, Maria Terezinha
spellingShingle Luzia Delgado, Carolina Maria
Souza de Paula, Alexandre
Santos, Marisa
Silveira Paulilo, Maria Terezinha
Water absorption and dormancy-breaking requirements of physically dormant seeds of Sophora tomentosa L. and Erythrina speciosa Andr. (Fabaceae-Faboideae)
author_facet Luzia Delgado, Carolina Maria
Souza de Paula, Alexandre
Santos, Marisa
Silveira Paulilo, Maria Terezinha
author_sort Luzia Delgado, Carolina Maria
description Water absorption and dormancy-breaking requirements of physically dormant seeds of Sophora tomentosa L. and Erythrina speciosa Andr. (Fabaceae-Faboideae) Carolina Maria Luzia Delgado1, Alexandre Souza de Paula2, Marisa Santos3 and Maria Terezinha Silveira Paulilo4 1-Departamento de Botânica, Universidade Federal de Santa Catarina, Florianópolis, 88040-900, Brazil; delgado_carol@yahoo.com.br2- Departamento de Botânica, Universidade Federal de Santa Catarina, Florianópolis, 88040-900, Brazil; alexandredepaula_07@hotmail.com3- Departamento de Botânica, Universidade Federal de Santa Catarina, Florianópolis, 88040-900, Brazil; marint@mbox1.ufsc.br4- Departamento de Botânica, Universidade Federal de Santa Catarina, Florianópolis, 88040-900, Brazil; paulilo@ccb.ufsc.br
title Water absorption and dormancy-breaking requirements of physically dormant seeds of Sophora tomentosa L. and Erythrina speciosa Andr. (Fabaceae-Faboideae)
title_short Water absorption and dormancy-breaking requirements of physically dormant seeds of Sophora tomentosa L. and Erythrina speciosa Andr. (Fabaceae-Faboideae)
title_full Water absorption and dormancy-breaking requirements of physically dormant seeds of Sophora tomentosa L. and Erythrina speciosa Andr. (Fabaceae-Faboideae)
title_fullStr Water absorption and dormancy-breaking requirements of physically dormant seeds of Sophora tomentosa L. and Erythrina speciosa Andr. (Fabaceae-Faboideae)
title_full_unstemmed Water absorption and dormancy-breaking requirements of physically dormant seeds of Sophora tomentosa L. and Erythrina speciosa Andr. (Fabaceae-Faboideae)
title_sort water absorption and dormancy-breaking requirements of physically dormant seeds of sophora tomentosa l. and erythrina speciosa andr. (fabaceae-faboideae)
title_alt Dormancy-breaking requirements of Sophora tomentosa and Erythrina speciosa (Fabaceae) seeds
publisher Universidad de Costa Rica
publishDate 2015
url https://revistas.ucr.ac.cr/index.php/rbt/article/view/13903
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spelling RBT139032022-06-09T17:42:18Z Dormancy-breaking requirements of Sophora tomentosa and Erythrina speciosa (Fabaceae) seeds Water absorption and dormancy-breaking requirements of physically dormant seeds of Sophora tomentosa L. and Erythrina speciosa Andr. (Fabaceae-Faboideae) Luzia Delgado, Carolina Maria Souza de Paula, Alexandre Santos, Marisa Silveira Paulilo, Maria Terezinha physical dormancy seeds tropical woody Fabaceae water gaps The physical dormancy of seeds has been poorly studied in species from tropical forests, such as the Atlantic Forest. This study aimed to examine the effect of moderate alternating temperatures on breaking the physical dormancy of seeds, the morphoanatomy and histochemistry of seed coats, and to locate the structure/region responsible for water entrance into the seed, after breaking the physical dormancy of seeds of two woody Fabaceae (subfamily Faboideae) species that occur in the Brazilian Atlantic Forest: Sophora tomentosa and Erythrina speciosa. To assess temperature effect, seeds were incubated in several temperature values that occur in the Atlantic Forest. For morphological and histochemical studies, sections of fixed seeds were subjected to different reagents, and were observed using light or epifluorescence microscopy, to analyze the anatomy and histochemistry of the seed coat. Treated and non-treated seeds were also analyzed using a scanning electron microscope (SEM) to observe the morphology of the seed coat. To localize the specific site of water entrance, the seeds were blocked with glue in different regions and also immersed in ink. In the present work a maximum temperature fluctuation of 15ºC was applied during a period of 20 days and these conditions did not increase the germination of S. tomentosa or E. speciosa. These results may indicate that these seeds require larger fluctuation of temperature than the applied or/and longer period of exposition to the temperature fluctuation. Blocking experiments water inlet combined with SEM analysis of the structures of seed coat for both species showed that besides the lens, the hilum and micropyle are involved in water absorption in seeds scarified with hot water. In seeds of E. speciosa the immersion of scarified seeds into an aniline aqueous solution showed that the solution first entered the seed through the hilum. Both species showed seed morphological and anatomical features for seed coats of the subfamily Faboideae. Lignin and callose were found around all palisade layers and the water impermeability and ecological role of these substances are discussed in the work. Water absorption and dormancy-breaking requirements of physically dormant seeds of Sophora tomentosa L. and Erythrina speciosa Andr. (Fabaceae-Faboideae) Carolina Maria Luzia Delgado1, Alexandre Souza de Paula2, Marisa Santos3 and Maria Terezinha Silveira Paulilo4 1-Departamento de Botânica, Universidade Federal de Santa Catarina, Florianópolis, 88040-900, Brazil; delgado_carol@yahoo.com.br2- Departamento de Botânica, Universidade Federal de Santa Catarina, Florianópolis, 88040-900, Brazil; alexandredepaula_07@hotmail.com3- Departamento de Botânica, Universidade Federal de Santa Catarina, Florianópolis, 88040-900, Brazil; marint@mbox1.ufsc.br4- Departamento de Botânica, Universidade Federal de Santa Catarina, Florianópolis, 88040-900, Brazil; paulilo@ccb.ufsc.br Universidad de Costa Rica 2015-03-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf text/html https://revistas.ucr.ac.cr/index.php/rbt/article/view/13903 10.15517/rbt.v63i1.13903 Revista de Biología Tropical; Vol. 63 No. 1 (2015): Volume 63 – Regular number 1 – March 2015; 285–294 Revista de Biología Tropical; Vol. 63 Núm. 1 (2015): Volumen 63 – Número regular 1 – Marzo 2015; 285–294 Revista Biología Tropical; Vol. 63 N.º 1 (2015): Volume 63 – Regular number 1 – March 2015; 285–294 2215-2075 0034-7744 10.15517/rbt.v63i1 eng https://revistas.ucr.ac.cr/index.php/rbt/article/view/13903/17591 https://revistas.ucr.ac.cr/index.php/rbt/article/view/13903/17592 Copyright (c) 2015 Revista de Biología Tropical http://creativecommons.org/licenses/by/4.0

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