Thermal stress and physiological changes in watermelon seeds
Autor(a) principal: | |
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Data de Publicação: | 2018 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Pesquisa Agropecuária Tropical (Online) |
Texto Completo: | https://revistas.ufg.br/pat/article/view/50404 |
Resumo: | Given that watermelon is a crop widespread around the world, there is considerable interest in verifying how its seeds physiologically behave under unfavorable temperature conditions. This study aimed to evaluate the biochemical changes mobilization and reserves degradation, as well as the enzyme activity, during seed germination and initial growth of watermelon seedlings subjected to thermal stress, using temperature, germination percentage, germination rate and relative germination frequency over the incubation time as evaluation parameters. The experimental design was completely randomized, in a 5 x 3 factorial scheme, with five temperatures (17 ºC, 20 ºC, 25 ºC, 30 ºC and 35 ºC) and three cultivars (Charleston Gray, Fairfax and Crimson Sweet), with 4 replicates of 50 seeds. Germination, seedling growth, reserve degradation and stress protection system were evaluated. Thermal stress caused deleterious effects on watermelon seeds with germination capacity at well defined temperature limits, being 25 ºC the ideal temperature, with the highest percentage of normal seedlings. Sub- (17 ºC) and supra-optimal (30 ºC) temperatures presented more than 80 % of abnormal seedlings. The ?-amylase enzyme activity is intense only at the beginning of germination. Under thermal stress, the proline contents increase mainly in the cotyledons. |
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Thermal stress and physiological changes in watermelon seedsEstresse térmico e alterações fisiológicas em sementes de melanciaCitrullus lanatus (Thunb.) Matsum. & Nakaienzymatic activitygermination.Citrullus lanatus (Thunb.) Matsum. & NakaiAtividade enzimáticaGerminaçãoGiven that watermelon is a crop widespread around the world, there is considerable interest in verifying how its seeds physiologically behave under unfavorable temperature conditions. This study aimed to evaluate the biochemical changes mobilization and reserves degradation, as well as the enzyme activity, during seed germination and initial growth of watermelon seedlings subjected to thermal stress, using temperature, germination percentage, germination rate and relative germination frequency over the incubation time as evaluation parameters. The experimental design was completely randomized, in a 5 x 3 factorial scheme, with five temperatures (17 ºC, 20 ºC, 25 ºC, 30 ºC and 35 ºC) and three cultivars (Charleston Gray, Fairfax and Crimson Sweet), with 4 replicates of 50 seeds. Germination, seedling growth, reserve degradation and stress protection system were evaluated. Thermal stress caused deleterious effects on watermelon seeds with germination capacity at well defined temperature limits, being 25 ºC the ideal temperature, with the highest percentage of normal seedlings. Sub- (17 ºC) and supra-optimal (30 ºC) temperatures presented more than 80 % of abnormal seedlings. The ?-amylase enzyme activity is intense only at the beginning of germination. Under thermal stress, the proline contents increase mainly in the cotyledons.Considerando-se que a melancia é uma cultura bem difundida no mundo, há grande interesse em verificar como suas sementes se comportam fisiologicamente sob condições de temperatura desfavoráveis. Objetivou-se avaliar as alterações bioquímicas de mobilização e degradação de reservas, bem como a atividade enzimática, durante a germinação de sementes e crescimento inicial de plântulas de melancia submetidas a estresse térmico, utilizando-se temperatura, porcentagem de germinação, taxa de germinação e frequência relativa de germinação ao longo do tempo de incubação como parâmetros de avaliação. O delineamento experimental foi inteiramente casualizado, em esquema fatorial 5 x 3, com cinco temperaturas (17 ºC, 20 ºC, 25 ºC, 30 ºC e 35 ºC) e três cultivares (Charleston Gray, Fairfax e Crimson Sweet), com 4 repetições de 50 sementes. Foram avaliados a germinação, crescimento de plântulas, degradação de reservas e sistema de proteção ao estresse. O estresse térmico causou efeitos deletérios em sementes de melancia com limites de germinação em temperaturas bem definidas, sendo 25 ºC a temperatura ideal, com o maior percentual de plântulas normais. Temperaturas sub (17 ºC) e supraótimas (30 ºC) apresentaram mais de 80 % de plântulas anormais. A atividade da enzima ?-amilase é intensa apenas no início da germinação. Sob estresse térmico, os teores de prolina aumentam principalmente nos cotilédones.Escola de Agronomia - Universidade Federal de Goiás2018-04-19info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionAvaliado por paresapplication/pdfhttps://revistas.ufg.br/pat/article/view/50404Pesquisa Agropecuária Tropical [Agricultural Research in the Tropics]; v. 48, n. 1, Jan./Mar. 2018; 66-74Pesquisa Agropecuária Tropical (Agricultural Research in the Tropics); v. 48, n. 1, jan./mar. 2018; 66-74Pesquisa Agropecuária Tropical; v. 48, n. 1, jan./mar. 2018; 66-741983-4063reponame:Pesquisa Agropecuária Tropical (Online)instname:Universidade Federal de Goiás (UFG)instacron:UFGenghttps://revistas.ufg.br/pat/article/view/50404/25425Copyright (c) 2018 Pesquisa Agropecuária Tropical (Agricultural Research in the Tropics)info:eu-repo/semantics/openAccessBarbosa da Silva, Rita de Cássiado Nascimento Araujo, MarceloLuiz Santos Ornellas, FábioFrança Dantas, Bárbara2020-07-13T19:01:49Zoai:ojs.revistas.ufg.br:article/50404Revistahttps://revistas.ufg.br/patPUBhttps://revistas.ufg.br/pat/oaiaseleguini.pat@gmail.com||mgoes@agro.ufg.br1983-40631517-6398opendoar:2024-05-21T19:56:18.936817Pesquisa Agropecuária Tropical (Online) - Universidade Federal de Goiás (UFG)true |
dc.title.none.fl_str_mv |
Thermal stress and physiological changes in watermelon seeds Estresse térmico e alterações fisiológicas em sementes de melancia |
title |
Thermal stress and physiological changes in watermelon seeds |
spellingShingle |
Thermal stress and physiological changes in watermelon seeds Barbosa da Silva, Rita de Cássia Citrullus lanatus (Thunb.) Matsum. & Nakai enzymatic activity germination. Citrullus lanatus (Thunb.) Matsum. & Nakai Atividade enzimática Germinação |
title_short |
Thermal stress and physiological changes in watermelon seeds |
title_full |
Thermal stress and physiological changes in watermelon seeds |
title_fullStr |
Thermal stress and physiological changes in watermelon seeds |
title_full_unstemmed |
Thermal stress and physiological changes in watermelon seeds |
title_sort |
Thermal stress and physiological changes in watermelon seeds |
author |
Barbosa da Silva, Rita de Cássia |
author_facet |
Barbosa da Silva, Rita de Cássia do Nascimento Araujo, Marcelo Luiz Santos Ornellas, Fábio França Dantas, Bárbara |
author_role |
author |
author2 |
do Nascimento Araujo, Marcelo Luiz Santos Ornellas, Fábio França Dantas, Bárbara |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Barbosa da Silva, Rita de Cássia do Nascimento Araujo, Marcelo Luiz Santos Ornellas, Fábio França Dantas, Bárbara |
dc.subject.por.fl_str_mv |
Citrullus lanatus (Thunb.) Matsum. & Nakai enzymatic activity germination. Citrullus lanatus (Thunb.) Matsum. & Nakai Atividade enzimática Germinação |
topic |
Citrullus lanatus (Thunb.) Matsum. & Nakai enzymatic activity germination. Citrullus lanatus (Thunb.) Matsum. & Nakai Atividade enzimática Germinação |
description |
Given that watermelon is a crop widespread around the world, there is considerable interest in verifying how its seeds physiologically behave under unfavorable temperature conditions. This study aimed to evaluate the biochemical changes mobilization and reserves degradation, as well as the enzyme activity, during seed germination and initial growth of watermelon seedlings subjected to thermal stress, using temperature, germination percentage, germination rate and relative germination frequency over the incubation time as evaluation parameters. The experimental design was completely randomized, in a 5 x 3 factorial scheme, with five temperatures (17 ºC, 20 ºC, 25 ºC, 30 ºC and 35 ºC) and three cultivars (Charleston Gray, Fairfax and Crimson Sweet), with 4 replicates of 50 seeds. Germination, seedling growth, reserve degradation and stress protection system were evaluated. Thermal stress caused deleterious effects on watermelon seeds with germination capacity at well defined temperature limits, being 25 ºC the ideal temperature, with the highest percentage of normal seedlings. Sub- (17 ºC) and supra-optimal (30 ºC) temperatures presented more than 80 % of abnormal seedlings. The ?-amylase enzyme activity is intense only at the beginning of germination. Under thermal stress, the proline contents increase mainly in the cotyledons. |
publishDate |
2018 |
dc.date.none.fl_str_mv |
2018-04-19 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Avaliado por pares |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://revistas.ufg.br/pat/article/view/50404 |
url |
https://revistas.ufg.br/pat/article/view/50404 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
https://revistas.ufg.br/pat/article/view/50404/25425 |
dc.rights.driver.fl_str_mv |
Copyright (c) 2018 Pesquisa Agropecuária Tropical (Agricultural Research in the Tropics) info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Copyright (c) 2018 Pesquisa Agropecuária Tropical (Agricultural Research in the Tropics) |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Escola de Agronomia - Universidade Federal de Goiás |
publisher.none.fl_str_mv |
Escola de Agronomia - Universidade Federal de Goiás |
dc.source.none.fl_str_mv |
Pesquisa Agropecuária Tropical [Agricultural Research in the Tropics]; v. 48, n. 1, Jan./Mar. 2018; 66-74 Pesquisa Agropecuária Tropical (Agricultural Research in the Tropics); v. 48, n. 1, jan./mar. 2018; 66-74 Pesquisa Agropecuária Tropical; v. 48, n. 1, jan./mar. 2018; 66-74 1983-4063 reponame:Pesquisa Agropecuária Tropical (Online) instname:Universidade Federal de Goiás (UFG) instacron:UFG |
instname_str |
Universidade Federal de Goiás (UFG) |
instacron_str |
UFG |
institution |
UFG |
reponame_str |
Pesquisa Agropecuária Tropical (Online) |
collection |
Pesquisa Agropecuária Tropical (Online) |
repository.name.fl_str_mv |
Pesquisa Agropecuária Tropical (Online) - Universidade Federal de Goiás (UFG) |
repository.mail.fl_str_mv |
aseleguini.pat@gmail.com||mgoes@agro.ufg.br |
_version_ |
1799874819886415872 |