Thermal stress and physiological changes in watermelon seeds
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| Format: | Artículo científico |
| Language: | en |
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Universidade Federal de Goiás
2018
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| _version_ | 1876422244144513024 |
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| author | Rita de Cássia Barbosa da Silva |
| author_facet | Rita de Cássia Barbosa da Silva |
| contents | Thermal stress and physiological changes in watermelon seeds Rita de Cássia Barbosa da Silva Marcelo do Nascimento Araujo Fábio Luiz Santos Ornellas Bárbara França Dantas Agrociencias & Nakai ) Matsum germination enzymatic activity Citrullus lanatus (Thunb 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. 2018 artículo científico 1517-6398 https://www.redalyc.org/articulo.oa?id=253067973009 https://www.redalyc.org/journal/2530/253067973009/ https://www.redalyc.org/journal/2530/253067973009/html/ https://www.redalyc.org/journal/2530/253067973009/253067973009.epub https://www.redalyc.org/journal/2530/253067973009/movil en http://www.redalyc.org/revista.oa?id=2530 Pesquisa Agropecuária Tropical application/pdf Universidade Federal de Goiás Pesquisa Agropecuária Tropical (Brasil) Num.1 Vol.48 |
| format | Artículo científico |
| id | redalyc_253067973009 |
| institution | Redalyc |
| language | en |
| publishDate | 2018 |
| publisher | Universidade Federal de Goiás |
| spellingShingle | Thermal stress and physiological changes in watermelon seeds Rita de Cássia Barbosa da Silva Agrociencias & Nakai ) Matsum germination enzymatic activity Citrullus lanatus (Thunb Thermal stress and physiological changes in watermelon seeds Rita de Cássia Barbosa da Silva Marcelo do Nascimento Araujo Fábio Luiz Santos Ornellas Bárbara França Dantas Agrociencias & Nakai ) Matsum germination enzymatic activity Citrullus lanatus (Thunb 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. 2018 artículo científico 1517-6398 https://www.redalyc.org/articulo.oa?id=253067973009 https://www.redalyc.org/journal/2530/253067973009/ https://www.redalyc.org/journal/2530/253067973009/html/ https://www.redalyc.org/journal/2530/253067973009/253067973009.epub https://www.redalyc.org/journal/2530/253067973009/movil en http://www.redalyc.org/revista.oa?id=2530 Pesquisa Agropecuária Tropical application/pdf Universidade Federal de Goiás Pesquisa Agropecuária Tropical (Brasil) Num.1 Vol.48 |
| title | Thermal stress and physiological changes in watermelon seeds |
| topic | Agrociencias & Nakai ) Matsum germination enzymatic activity Citrullus lanatus (Thunb |
| url | https://www.redalyc.org/articulo.oa?id=253067973009 https://www.redalyc.org/journal/2530/253067973009/ https://www.redalyc.org/journal/2530/253067973009/html/ https://www.redalyc.org/journal/2530/253067973009/253067973009.epub https://www.redalyc.org/journal/2530/253067973009/movil |