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  <titleInfo>
    <title>Drought stress effects on germination and reserve degradation of Aspidosperma polyneuron seeds</title>
  </titleInfo>
  <name type="personal">
    <namePart>Rodrigues, Guilherme Almeida Garcia</namePart>
    <role>
      <roleTerm authority="marcrelator" type="text">creator</roleTerm>
    </role>
  </name>
  <name type="personal">
    <namePart>Ribeiro, Maiara Iadwizak</namePart>
    <role>
      <roleTerm authority="marcrelator" type="text">creator</roleTerm>
    </role>
  </name>
  <name type="personal">
    <namePart>Luz, Ezequiel Marçal Zanchetti da</namePart>
    <role>
      <roleTerm authority="marcrelator" type="text">creator</roleTerm>
    </role>
  </name>
  <name type="personal">
    <namePart>Porto, Erly Carlos</namePart>
    <role>
      <roleTerm authority="marcrelator" type="text">creator</roleTerm>
    </role>
  </name>
  <name type="personal">
    <namePart>Matias, Gabriele Larissa</namePart>
    <role>
      <roleTerm authority="marcrelator" type="text">creator</roleTerm>
    </role>
  </name>
  <name type="personal">
    <namePart>Corsato, Jaqueline Malagutti</namePart>
    <role>
      <roleTerm authority="marcrelator" type="text">creator</roleTerm>
    </role>
  </name>
  <name type="personal">
    <namePart>Fortes, Andréa Maria Teixeira</namePart>
    <role>
      <roleTerm authority="marcrelator" type="text">creator</roleTerm>
    </role>
  </name>
  <typeOfResource>text</typeOfResource>
  <genre authority="marc">periodical</genre>
  <genre authority="marc">abstract or summary</genre>
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    <issuance>continuing</issuance>
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  <language>
    <languageTerm authority="iso639-2b" type="code">eng</languageTerm>
  </language>
  <abstract>


ABSTRACT:      Seeds  are  exposed  to  diverse  environmental  factors  when  dispersed,  including  abiotic  stresses,  which  will  affect  germination.  Drought  is  the  most  important  factor  affecting  germination,  since  water  is  essential  for  seed  development.  Aspidosperma  polyneuron  is  a  native  endangered  species  which  has  been  extensively  exploited,  mainly  for  timber  extraction  purposes.  This  study  analyzed  germination  and  degradation  of  soluble  sugars  and  proteins  of  A.  polyneuron  seeds  during  germination  under  water  stress.  Seeds  were  placed  on  Germitest  papers  moistened  with  different  water  potential  solutions,  varying from 0.0 to -1.4 MPa. Degradation of soluble sugars and soluble proteins was assessed in five stages of germination at the different water potentials. A. polyneuron seeds lost germination capacity as the water potential decreased, being unable to germinate below -0.6 MPa. Glutelin was the most abundant storage protein in the seed, while prolamin was the least. Reserve degradation  was  altered  in  negative  water  potentials.  Soluble  proteins  are  degraded  faster  and  soluble  sugars  are  degraded  slower as the water potential drops.  



Key words:      native species; seed imbibition; soluble proteins; soluble sugars; water potential</abstract>
  <abstract>


RESUMO:         Quando  dispersas,  as  sementes  são  expostas  à  diversos  fatores  ambientais,  incluindo  estresses  abióticos,  os  quais irão afetar sua germinação. A seca é o fator mais limitante que afeta a germinação, já que a água é essencial para o desenvolvimento da semente. Aspidosperma polyneuron é uma espécie nativa em perigo de extinção, extensamente explorada para extração madeireira. Este estudo analisou a germinação e degradação de açúcares e proteínas solúveis de A. polyneurondurante  a  germinação  sob  estresse  hídrico.  Sementes  foram  dispostas  em  papéis  Germitest  umedecidos  com  soluções  em  diferentes potenciais hídricos, que variaram de 0,0 à -1,4 MPa. A degradação de açúcares e proteínas solúveis foi avaliada em cinco estágios de germinação nos diferentes potenciais hídricos. Sementes de A. polyneuron perderam capacidade germinativa conforme o potencial hídrico diminuiu, não germinando abaixo de -0,6 MPa. Glutelina foi a proteína de armazenamento mais abundante na semente, enquanto prolamina a menos presente. A degradação de reservas foi alterada em potenciais hídricos negativos, sendo que as proteínas solúveis foram degradadas mais rapidamente e os açúcares mais lentamente conforme o potencial hídrico diminuiu. 


Palavras-chave:       espécie nativa; embebição de sementes; proteínas solúveis; açúcares solúveis; potencial hídri</abstract>
  <note>

Publicação online; 46 ref.; 5 illus.; Summaries (En, Pt)</note>
  <subject>
    <topic>ESPÉCIE NATIVA</topic>
  </subject>
  <subject>
    <topic>SEMENTE</topic>
  </subject>
  <subject>
    <topic>GERMINAÇÃO</topic>
  </subject>
  <subject>
    <topic>CONDIÇÃO AMBIENTAL</topic>
  </subject>
  <subject>
    <topic>DEFICIÊNCIA  HÍDRICA</topic>
  </subject>
  <relatedItem type="host">
    <titleInfo>
      <title>Revista Brasileira de Ciências Agrárias (Brazil)</title>
    </titleInfo>
    <originInfo>
      <publisher>Recife-PE Universidade Federal Rural de Pernambuco 2006</publisher>
    </originInfo>
    <identifier>2026-1601</identifier>
    <identifier type="issn">1981-1160</identifier>
    <identifier type="local">BR2026000134</identifier>
    <part>
      <text>v. 14(4) p. 1-10; (2019)</text>
    </part>
  </relatedItem>
  <identifier type="uri">http://www.agraria.pro.br/ojs32/index.php/RBCA/article/view/v14i4a5903/123</identifier>
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    <url>http://www.agraria.pro.br/ojs32/index.php/RBCA/article/view/v14i4a5903/123</url>
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    <recordCreationDate encoding="marc">260416</recordCreationDate>
    <recordChangeDate encoding="iso8601">20260416142901.0</recordChangeDate>
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      <languageTerm authority="iso639-2b" type="code">eng</languageTerm>
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