This study evaluated the contributions of Styrax camporum seed morphology (size of seeds, presence or absence of endocarp attached to the seed), different substrates (filter paper, vermiculite, sand and the soils of cerrado s. str., cerradão and a riparian forest), different water potential...

Full description

Bibliographic Details
Main Authors: Edson Simão, Adriana T. Nakamura, Massanori Takaki
Format: Article
Language:English
Published: Academia Brasileira de Ciências 2013-01-01
Series:Anais da Academia Brasileira de Ciências
Subjects:
Online Access:http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100295
_version_ 1811216809113681920
author Edson Simão
Adriana T. Nakamura
Massanori Takaki
author_facet Edson Simão
Adriana T. Nakamura
Massanori Takaki
author_sort Edson Simão
collection DOAJ
description This study evaluated the contributions of Styrax camporum seed morphology (size of seeds, presence or absence of endocarp attached to the seed), different substrates (filter paper, vermiculite, sand and the soils of cerrado s. str., cerrad&#227;o and a riparian forest), different water potentials (0, -0.1, -0.2, -0.3, -0.4 and -0.5 MPa), light and temperature to seed germination. Seed size did not affect the germination percentage when seeds were sown on vermiculite. Seeds were affected by small variations in the moisture content of the tested substrates, showing a significant decrease in germination under water potentials lower than -0.1 MPa, close to the field capacity of cerrado s. str. soils. At the temperatures of 15 and 20&#176;C, a significant decrease in germination was observed. Thus, the availability of water in cerrado soils associated to temperature modulate the distribution of germination in this species. Seed morphology contributes to the maintenance of seeds in the soil, and the lack of synchrony in seed germination spreads the distribution of germination in time. These peculiarities allow the emergency of seedlings at different time periods and establishment conditions, an adaptative response of S. camporum to the cerrado environment.<br>Este estudo avaliou a contribui&#231;&#227;o da morfologia da semente de Styrax camporum (tamanho de sementes, presen&#231;a ou aus&#234;ncia do endocarpo aderido &#224; semente), diferentes substratos (papel filtro, vermiculita, areia e solo: cerrado, cerrad&#227;o, mata de brejo), diferentes potenciais de &#225;gua (0; -0,1; -0,2; -0,3; -0,4 e -0,5 MPa), luz e temperatura na germina&#231;&#227;o. O tamanho das sementes n&#227;o influencia na porcentagem de germina&#231;&#227;o quando semeadas sob vermiculita. As sementes foram sens&#237;veis a pequenas varia&#231;&#245;es de umidade no substrato, mostrando redu&#231;&#227;o significativa da germina&#231;&#227;o em potenciais de &#225;gua abaixo de -0,1 MPa, o qual &#233; pr&#243;ximo &#224; capacidade de campo do solo de cerrado. Sob temperaturas de 15 e 20&#176;C houve redu&#231;&#227;o significativa da germina&#231;&#227;o. Dessa forma, a disponibilidade de &#225;gua no solo de cerrado juntamente com a temperatura modulam a distribui&#231;&#227;o da germina&#231;&#227;o da esp&#233;cie. A morfologia contribui para a perman&#234;ncia das sementes no solo e a falta de sincronismo de germina&#231;&#227;o permite a distribui&#231;&#227;o da germina&#231;&#227;o ao longo do tempo. Estas caracter&#237;sticas proporcionam a emerg&#234;ncia de pl&#226;ntulas em diferentes per&#237;odos e condi&#231;&#245;es para estabelecimento e configuramse como uma adapta&#231;&#227;o da esp&#233;cie ao cerrado.
first_indexed 2024-04-12T06:44:28Z
format Article
id doaj.art-1e98508dd31242f99db079a465b165bb
institution Directory Open Access Journal
issn 0001-3765
1678-2690
language English
last_indexed 2024-04-12T06:44:28Z
publishDate 2013-01-01
publisher Academia Brasileira de Ciências
record_format Article
series Anais da Academia Brasileira de Ciências
spelling doaj.art-1e98508dd31242f99db079a465b165bb2022-12-22T03:43:35ZengAcademia Brasileira de CiênciasAnais da Academia Brasileira de Ciências0001-37651678-26902013-01-01851295306Edson SimãoAdriana T. NakamuraMassanori TakakiThis study evaluated the contributions of Styrax camporum seed morphology (size of seeds, presence or absence of endocarp attached to the seed), different substrates (filter paper, vermiculite, sand and the soils of cerrado s. str., cerrad&#227;o and a riparian forest), different water potentials (0, -0.1, -0.2, -0.3, -0.4 and -0.5 MPa), light and temperature to seed germination. Seed size did not affect the germination percentage when seeds were sown on vermiculite. Seeds were affected by small variations in the moisture content of the tested substrates, showing a significant decrease in germination under water potentials lower than -0.1 MPa, close to the field capacity of cerrado s. str. soils. At the temperatures of 15 and 20&#176;C, a significant decrease in germination was observed. Thus, the availability of water in cerrado soils associated to temperature modulate the distribution of germination in this species. Seed morphology contributes to the maintenance of seeds in the soil, and the lack of synchrony in seed germination spreads the distribution of germination in time. These peculiarities allow the emergency of seedlings at different time periods and establishment conditions, an adaptative response of S. camporum to the cerrado environment.<br>Este estudo avaliou a contribui&#231;&#227;o da morfologia da semente de Styrax camporum (tamanho de sementes, presen&#231;a ou aus&#234;ncia do endocarpo aderido &#224; semente), diferentes substratos (papel filtro, vermiculita, areia e solo: cerrado, cerrad&#227;o, mata de brejo), diferentes potenciais de &#225;gua (0; -0,1; -0,2; -0,3; -0,4 e -0,5 MPa), luz e temperatura na germina&#231;&#227;o. O tamanho das sementes n&#227;o influencia na porcentagem de germina&#231;&#227;o quando semeadas sob vermiculita. As sementes foram sens&#237;veis a pequenas varia&#231;&#245;es de umidade no substrato, mostrando redu&#231;&#227;o significativa da germina&#231;&#227;o em potenciais de &#225;gua abaixo de -0,1 MPa, o qual &#233; pr&#243;ximo &#224; capacidade de campo do solo de cerrado. Sob temperaturas de 15 e 20&#176;C houve redu&#231;&#227;o significativa da germina&#231;&#227;o. Dessa forma, a disponibilidade de &#225;gua no solo de cerrado juntamente com a temperatura modulam a distribui&#231;&#227;o da germina&#231;&#227;o da esp&#233;cie. A morfologia contribui para a perman&#234;ncia das sementes no solo e a falta de sincronismo de germina&#231;&#227;o permite a distribui&#231;&#227;o da germina&#231;&#227;o ao longo do tempo. Estas caracter&#237;sticas proporcionam a emerg&#234;ncia de pl&#226;ntulas em diferentes per&#237;odos e condi&#231;&#245;es para estabelecimento e configuramse como uma adapta&#231;&#227;o da esp&#233;cie ao cerrado.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100295cerradoestresse hídricomorfofisiologiaStyracaceaevermiculitacerradowater stressmorphophysiologyStyracaceaevermiculite
spellingShingle Edson Simão
Adriana T. Nakamura
Massanori Takaki
Anais da Academia Brasileira de Ciências
cerrado
estresse hídrico
morfofisiologia
Styracaceae
vermiculita
cerrado
water stress
morphophysiology
Styracaceae
vermiculite
topic cerrado
estresse hídrico
morfofisiologia
Styracaceae
vermiculita
cerrado
water stress
morphophysiology
Styracaceae
vermiculite
url http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100295