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| Registros recuperados: 407 | |
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| AMBROSIO, A. S.; PORTUGAL, J. A. N.; SOUZA, K. R. D.; SILVA, L. C.; DIAS, D. F.; MANTOVANI, J. R.; MAGALHAES, P. C.; SOUZA, T. B.; SOUZA, T. C.. |
| This study tested a tosylated and azide trehalose derivative mixture for its ability to mitigate water deficit-induced stress in maize via photosynthetic efficiency analyses. The experiment was conducted in greenhouse pots, using a maize hybrid that is sensitive to drought. The mixture of derivatives (28 mM) was applied with a hand sprayer. Plants containing five/six fully expanded leaves were subjected to water deficit stress for 12 d, followed by rehydration. The derivative mixture increased the photosynthetic rate, electron transport rate, and photochemical quenching, and mitigated damage to photosystem II. Moreover, it led to anatomical modifications in the leaf that increased the photosynthetic rate. These results suggest that the trehalose derivative... |
| Tipo: Artigo de periódico |
Palavras-chave: Troca gasosa; Anatomia foliar; Densidade estomática; Milho; Clorofila. |
| Ano: 2020 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1124330 |
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| REIS, C. O. dos; MAGALHAES, P. C.; AVILA, R. G.; ALMEIDA, L. G.; RABELO, V. M.; CARVALHO, D. T.; CABRAL, D. F.; KARAM, D.; SOUZA, T. C. de. |
| Chitosan induces plant tolerance to various abiotic stresses, including water deficit. However, its use may be limited, due to its constitution and low solubility in water. Thus, chemical modifications were proposed in this study with the objective of potentializing its biological effects in maize plants. The derivatives were semi-synthesized (N-succinyl and N,O-dicarboxymethyl) and, together with chitosan, they were applied, via the leaf, in a drought-sensitive maize hybrid (BRS1030) under pre-flowering water deficit. The water deficit was maintained for 15 days and the analyses were performed at the beginning and end of stress, and also in rehydration. Leaf water potential, gas exchange, chlorophyll fluorescence, and content of chloroplastidic pigments... |
| Tipo: Artigo de periódico |
Palavras-chave: Déficit hídrico; Bioestimulante; Trocas gasosas; Potencial hídrico foliar; Milho. |
| Ano: 2019 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1111698 |
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| FERREIRA, V. M.; MAGALHAES, P. C.; DURAES, F. O. M.; VASCONCELLOS, C. A.; ARAUJO NETO, J. C. de. |
| A quantidade de nutrientes presente nos tecidos vegetais de uma determinada espécie, em um dado momento, é função da interação das condições ambientais com o genótipo e é de importância ecológica e econômica, pois permite a otimização do uso dos insumos e de diferentes manejos importantes na sustentabilidade do sistema produtivo. Neste trabalho, foram quantificados os macronutrientes nos diferentes órgãos de plantas de dois híbridos duplos de milho (BRS 2121 e BR 205) cultivados em campo, submetidos a quatro épocas (dez dias antes ou 15, 30 e 50 dias após a floração) de supressão da irrigação e três tipos de parcelamento da adubação de cobertura de N e K (10 kg de N ha-1 + 90 kg de K2O ha-1 no plantio e 120 kg de N ha-1 no estádio V8; 10 kg de N ha-1 + 45... |
| Tipo: Artigo de periódico |
Palavras-chave: Estresse hídrico; Nutrição mineral.; Milho; Zea Mays.. |
| Ano: 2008 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/491629 |
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| DÍAZ, A. S.; AGUIAR, G. M.; PEREIRA, M. P.; CASTRO, E. M. de; MAGALHAES, P. C.; PEREIRA, F. J.. |
| Root cortical aerenchyma (RCA) is suggested to reduce metabolic cost for root growth, but it might lower water uptake by plants. The objective of this work was to evaluate the effects of drought and phosphorus on the RCA development along the root axis and to elucidate its role in water stress tolerance of two maize genotypes. Plants of drought-tolerant DKB390 and drought-sensitive BRS1010 genotypes were grown in Vermiculite at field capacity of 100, 75, 50, and 25 % and supplied with 0.1, 0.4, and 0.8 mM phosphorus. Growth parameters, RCA, and plant P content were evaluated for all plants. Higher RCA development was observed in DKB390 than in BRS1010. Drought reduced the percentage of RCA in the root-hair zone of both genotypes but increased its... |
| Tipo: Artigo de periódico |
Palavras-chave: Biomassa; Resistência a Seca; Taxa de Crescimento; Raiz; Milho. |
| Ano: 2018 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1105591 |
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| Registros recuperados: 407 | |
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