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Registro Completo |
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Biblioteca(s): |
Embrapa Milho e Sorgo. |
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Data corrente: |
28/05/2024 |
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Data da última atualização: |
28/05/2024 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
TOLEDO, C. C.; SILVA, A. C. C. da; DEL PELOSO, M. C.; LEITE, M. A.; BRESSANIN, L. A. A.; ESTEVES, G.; MAGALHAES, P. C.; SOUZA, T. C. de; SANTOS-FILHO, P. R. dos. |
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Afiliação: |
UNIVERSIDADE FEDERAL DE ALFENAS; UNIVERSIDADE FEDERAL DE ALFENAS; UNIVERSIDADE FEDERAL DE ALFENAS; UNIVERSIDADE FEDERAL DE ALFENAS; UNIVERSIDADE FEDERAL DE ALFENAS; UNIVERSIDADE FEDERAL DE ALFENAS; PAULO CESAR MAGALHAES, CNPMS; UNIVERSIDADE FEDERAL DE ALFENAS; UNIVERSIDADE FEDERAL DE ALFENAS. |
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Título: |
Putrescine priming effects on chlorophyll fluorescence, antioxidant enzyme activity, and primary metabolite accumulation in maize seedlings under water deficit. |
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Ano de publicação: |
2024 |
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Fonte/Imprenta: |
Biologia Plantarum, v. 68, p. 22-30, 2024. |
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Idioma: |
Inglês |
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Conteúdo: |
This study aimed to evaluate the effect of putrescine priming on the initial growth, chlorophyll fluorescence, primary metabolites accumulation, and antioxidant enzyme activities in two maize hybrids with contrasting drought tolerances. Seeds of Zea mays L. hybrids DKB 390 (drought tolerant) and BRS 1030 (drought sensitive) were primed with putrescine (10 or 100 µM). Paper rolls moistened with distilled water or mannitol (-0.6 MPa) were maintened at 30°C for 7 d. The growth parameters were higher in the DKB hybrid than in the BRS hybrid. Putrescine priming (10 µM) promoted the root growth of BRS at levels similar to those of DKB and improved photochemical and non-photochemical quenching and maximum quantum efficiency of BRS seedlings. Higher levels of reducing sugars were found in DKB seedlings when compared to BRS in both roots and leaves, especially with 100 µM putrescine. Total soluble sugar and starch were lower in the maize roots under water deficit and with 10 µM putrescine for both hybrids. BRS seedlings showed higher starch content in the leaves in the control and 10 µM putrescine treatments. Superoxide dismutase was activated in BRS plants by the priming, especially in the roots, but this effect was not observed for catalase, ascorbate, or guaiacol peroxidase, although the DKB seedlings presented much higher guaiacol peroxidade activity than BRS seedlings in both the roots and shoots. In conclusion, putrescine priming (10 M) improved the morphological and biochemical responses of the drought sensitive maize hybrid BRS. MenosThis study aimed to evaluate the effect of putrescine priming on the initial growth, chlorophyll fluorescence, primary metabolites accumulation, and antioxidant enzyme activities in two maize hybrids with contrasting drought tolerances. Seeds of Zea mays L. hybrids DKB 390 (drought tolerant) and BRS 1030 (drought sensitive) were primed with putrescine (10 or 100 µM). Paper rolls moistened with distilled water or mannitol (-0.6 MPa) were maintened at 30°C for 7 d. The growth parameters were higher in the DKB hybrid than in the BRS hybrid. Putrescine priming (10 µM) promoted the root growth of BRS at levels similar to those of DKB and improved photochemical and non-photochemical quenching and maximum quantum efficiency of BRS seedlings. Higher levels of reducing sugars were found in DKB seedlings when compared to BRS in both roots and leaves, especially with 100 µM putrescine. Total soluble sugar and starch were lower in the maize roots under water deficit and with 10 µM putrescine for both hybrids. BRS seedlings showed higher starch content in the leaves in the control and 10 µM putrescine treatments. Superoxide dismutase was activated in BRS plants by the priming, especially in the roots, but this effect was not observed for catalase, ascorbate, or guaiacol peroxidase, although the DKB seedlings presented much higher guaiacol peroxidade activity than BRS seedlings in both the roots and shoots. In conclusion, putrescine priming (10 M) improved the morphological and bioc... Mostrar Tudo |
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Palavras-Chave: |
Extinção fotoquímica; Fluorescência; Poliaminas. |
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Thesagro: |
Açúcar; Antioxidante; Clorofila; Enzima. |
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Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
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Marc: |
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Embrapa Milho e Sorgo (CNPMS) |
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| 5. |  | CUENCA, M. A. G. Economia. In: SOBRAL, L. F. (Ed.). Coco: o produtor pergunta, a Embrapa responde. Brasília, DF: Embrapa, 2018. 200 p. il. (Coleção 500 perguntas, 500 respostas). cap. 12. p. 187-195.| Tipo: Capítulo em Livro Técnico-Científico |
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