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Registro Completo |
Biblioteca(s): |
Embrapa Semiárido. |
Data corrente: |
26/04/2018 |
Data da última atualização: |
02/05/2018 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
SILVA, R. de C. B. da; ARAÚJO, M. do N.; ORNELLAS, F. L. S.; DANTAS, B. F. |
Afiliação: |
RITA DE CÁSSIA BARBOSA DA SILVA; MARCELO DO NASCIMENTO ARAUJO; FÁBIO LUIZ SANTOS ORNELLAS, Universidade Estadual de Santa Cruz, Ilhéus, BA; BARBARA FRANCA DANTAS, CPATSA. |
Título: |
Thermal stress and physiological changes in watermelon seeds. |
Ano de publicação: |
2018 |
Fonte/Imprenta: |
Pesquisa Agropecuária Tropical, Goiânia, v. 48, n. 1, p. 66-74, jan./mar. 2018. |
ISSN: |
1983-4063 |
DOI: |
10.1590/1983-40632018v4850404 |
Idioma: |
Inglês |
Conteúdo: |
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 α-amylase enzyme activity is intense only at the beginning of germination. Under thermal stress, the proline contents increase mainly in the cotyledons. |
Palavras-Chave: |
Enzymatic activity. |
Thesagro: |
Atividade Enzimática; Citrullus Lanatus; Fisiologia; Germinação; Melancia; Semente. |
Thesaurus Nal: |
Germination. |
Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/176020/1/Barbara-2018.pdf
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Marc: |
LEADER 02174naa a2200277 a 4500 001 2090900 005 2018-05-02 008 2018 bl uuuu u00u1 u #d 022 $a1983-4063 024 7 $a10.1590/1983-40632018v4850404$2DOI 100 1 $aSILVA, R. de C. B. da 245 $aThermal stress and physiological changes in watermelon seeds.$h[electronic resource] 260 $c2018 520 $aGiven 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 α-amylase enzyme activity is intense only at the beginning of germination. Under thermal stress, the proline contents increase mainly in the cotyledons. 650 $aGermination 650 $aAtividade Enzimática 650 $aCitrullus Lanatus 650 $aFisiologia 650 $aGerminação 650 $aMelancia 650 $aSemente 653 $aEnzymatic activity 700 1 $aARAÚJO, M. do N. 700 1 $aORNELLAS, F. L. S. 700 1 $aDANTAS, B. F. 773 $tPesquisa Agropecuária Tropical, Goiânia$gv. 48, n. 1, p. 66-74, jan./mar. 2018.
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