Influence of temperature on seed germination and on the vigour of seedlings of cupuaçu (Theobroma grandiflorum (Willd. ex-Spreng) Schum.)

Detalhes bibliográficos
Autor(a) principal: Garcia, Lucinda Carneiro
Data de Publicação: 1994
Tipo de documento: Artigo
Idioma: por
Título da fonte: Pesquisa Agropecuária Brasileira (Online)
Texto Completo: https://seer.sct.embrapa.br/index.php/pab/article/view/4159
Resumo: The effects of different temperatures on seed germination and on the vigour of seedlings of Cupuaçu (Theobroma grandiflorum (Willd. ex-Spreng) Schum.) were studied. The experimental design consisted of 5 x 3 test variants, carried out in 12 replications each with 17 seeds. The effects of five different temperatures (15, 20, 25, 30 and 35°C) and three different substrates (sand, sawdust and vermiculite) were tested in darkness. After the fifth day from sowing, the percentage of the viable seeds were estimated daily. Additionally, the total germination rate and the percentage of normally developed seedlings were recorded. From the numbers of seeds which germinated daily, an "index of germination velocity" was calculated. Measurement of seedlings height, radicle length and dry weight of the cotyledones were done. At the 15°C temperature level seed germination was inhibited while accelerated at the 35°C level although damaged the cotyledones and the radicles. The best germination temperature was between 20 and 30°C independently of the substrate used.
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spelling Influence of temperature on seed germination and on the vigour of seedlings of cupuaçu (Theobroma grandiflorum (Willd. ex-Spreng) Schum.)Influência da temperatura na germinação de sementes e no vigor de plântulas de cupuaçuzeiro (Theobroma grandiflorum (Willd. ex-Spreng) Schum.)tests of viability; substrates; index of germination speed; physiological qualitytestes de viabilidade; substratos; índices de velocidade de germinação; qualidade fisiológicaThe effects of different temperatures on seed germination and on the vigour of seedlings of Cupuaçu (Theobroma grandiflorum (Willd. ex-Spreng) Schum.) were studied. The experimental design consisted of 5 x 3 test variants, carried out in 12 replications each with 17 seeds. The effects of five different temperatures (15, 20, 25, 30 and 35°C) and three different substrates (sand, sawdust and vermiculite) were tested in darkness. After the fifth day from sowing, the percentage of the viable seeds were estimated daily. Additionally, the total germination rate and the percentage of normally developed seedlings were recorded. From the numbers of seeds which germinated daily, an "index of germination velocity" was calculated. Measurement of seedlings height, radicle length and dry weight of the cotyledones were done. At the 15°C temperature level seed germination was inhibited while accelerated at the 35°C level although damaged the cotyledones and the radicles. The best germination temperature was between 20 and 30°C independently of the substrate used.Estudou-se a influência de diferentes temperaturas na germinação de sementes e no vigor de plântulas de cupuaçu (Theobroma grandiforum (Willd. ex-Spreng) Schum.). Utilizou-se o delineamento experimental inteiramente casualizado, no fatorial 5 x 3 e 12 repetições de 17 sementes. Foram testadas as temperaturas de 15, 20, 25, 30 e 35°C, nos substratos areia, serragem e vermiculita, no escuro. A partir do quinto dia da semeadura, foram estimadas a viabilidade das sementes pelas percentagens diária e total de germinação e a percentagem de plântulas normais. Transformaram-se os valores da germinação diária em índice de velocidade de germinação. Foram determinados o vigor das plântulas pela altura, o comprimento das raízes e a matéria seca dos cotilédones. A temperatura de 15°C causou uma inibição na germinação das sementes, e 35°C, uma aceleração. Entretanto, esta temperatura causou queima do hipocótilo e da radícula das plântulas. A temperatura ótima para germinação foi entre 20 a 30°C, independentemente do substrato utilizado.Pesquisa Agropecuaria BrasileiraPesquisa Agropecuária BrasileiraGarcia, Lucinda Carneiro1994-07-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://seer.sct.embrapa.br/index.php/pab/article/view/4159Pesquisa Agropecuaria Brasileira; v.29, n.7, jul. 1994; 1145-1150Pesquisa Agropecuária Brasileira; v.29, n.7, jul. 1994; 1145-11501678-39210100-104xreponame:Pesquisa Agropecuária Brasileira (Online)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPAporhttps://seer.sct.embrapa.br/index.php/pab/article/view/4159/1450info:eu-repo/semantics/openAccess2012-02-13T20:42:57Zoai:ojs.seer.sct.embrapa.br:article/4159Revistahttp://seer.sct.embrapa.br/index.php/pabPRIhttps://old.scielo.br/oai/scielo-oai.phppab@sct.embrapa.br || sct.pab@embrapa.br1678-39210100-204Xopendoar:2012-02-13T20:42:57Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false
dc.title.none.fl_str_mv Influence of temperature on seed germination and on the vigour of seedlings of cupuaçu (Theobroma grandiflorum (Willd. ex-Spreng) Schum.)
Influência da temperatura na germinação de sementes e no vigor de plântulas de cupuaçuzeiro (Theobroma grandiflorum (Willd. ex-Spreng) Schum.)
title Influence of temperature on seed germination and on the vigour of seedlings of cupuaçu (Theobroma grandiflorum (Willd. ex-Spreng) Schum.)
spellingShingle Influence of temperature on seed germination and on the vigour of seedlings of cupuaçu (Theobroma grandiflorum (Willd. ex-Spreng) Schum.)
Garcia, Lucinda Carneiro
tests of viability; substrates; index of germination speed; physiological quality
testes de viabilidade; substratos; índices de velocidade de germinação; qualidade fisiológica
title_short Influence of temperature on seed germination and on the vigour of seedlings of cupuaçu (Theobroma grandiflorum (Willd. ex-Spreng) Schum.)
title_full Influence of temperature on seed germination and on the vigour of seedlings of cupuaçu (Theobroma grandiflorum (Willd. ex-Spreng) Schum.)
title_fullStr Influence of temperature on seed germination and on the vigour of seedlings of cupuaçu (Theobroma grandiflorum (Willd. ex-Spreng) Schum.)
title_full_unstemmed Influence of temperature on seed germination and on the vigour of seedlings of cupuaçu (Theobroma grandiflorum (Willd. ex-Spreng) Schum.)
title_sort Influence of temperature on seed germination and on the vigour of seedlings of cupuaçu (Theobroma grandiflorum (Willd. ex-Spreng) Schum.)
author Garcia, Lucinda Carneiro
author_facet Garcia, Lucinda Carneiro
author_role author
dc.contributor.none.fl_str_mv

dc.contributor.author.fl_str_mv Garcia, Lucinda Carneiro
dc.subject.por.fl_str_mv tests of viability; substrates; index of germination speed; physiological quality
testes de viabilidade; substratos; índices de velocidade de germinação; qualidade fisiológica
topic tests of viability; substrates; index of germination speed; physiological quality
testes de viabilidade; substratos; índices de velocidade de germinação; qualidade fisiológica
description The effects of different temperatures on seed germination and on the vigour of seedlings of Cupuaçu (Theobroma grandiflorum (Willd. ex-Spreng) Schum.) were studied. The experimental design consisted of 5 x 3 test variants, carried out in 12 replications each with 17 seeds. The effects of five different temperatures (15, 20, 25, 30 and 35°C) and three different substrates (sand, sawdust and vermiculite) were tested in darkness. After the fifth day from sowing, the percentage of the viable seeds were estimated daily. Additionally, the total germination rate and the percentage of normally developed seedlings were recorded. From the numbers of seeds which germinated daily, an "index of germination velocity" was calculated. Measurement of seedlings height, radicle length and dry weight of the cotyledones were done. At the 15°C temperature level seed germination was inhibited while accelerated at the 35°C level although damaged the cotyledones and the radicles. The best germination temperature was between 20 and 30°C independently of the substrate used.
publishDate 1994
dc.date.none.fl_str_mv 1994-07-01
dc.type.none.fl_str_mv
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv https://seer.sct.embrapa.br/index.php/pab/article/view/4159
url https://seer.sct.embrapa.br/index.php/pab/article/view/4159
dc.language.iso.fl_str_mv por
language por
dc.relation.none.fl_str_mv https://seer.sct.embrapa.br/index.php/pab/article/view/4159/1450
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Pesquisa Agropecuaria Brasileira
Pesquisa Agropecuária Brasileira
publisher.none.fl_str_mv Pesquisa Agropecuaria Brasileira
Pesquisa Agropecuária Brasileira
dc.source.none.fl_str_mv Pesquisa Agropecuaria Brasileira; v.29, n.7, jul. 1994; 1145-1150
Pesquisa Agropecuária Brasileira; v.29, n.7, jul. 1994; 1145-1150
1678-3921
0100-104x
reponame:Pesquisa Agropecuária Brasileira (Online)
instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron:EMBRAPA
instname_str Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron_str EMBRAPA
institution EMBRAPA
reponame_str Pesquisa Agropecuária Brasileira (Online)
collection Pesquisa Agropecuária Brasileira (Online)
repository.name.fl_str_mv Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
repository.mail.fl_str_mv pab@sct.embrapa.br || sct.pab@embrapa.br
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