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Action of N-succinyl and N,O-dicarboxymethyl chitosan derivatives on chlorophyll photosynthesis and fluorescence in drought-sensitive maize. Repositório Alice
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 em periódico indexado (ALICE) 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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Leaf application of chitosan and physiological evaluation of maize hybrids contrasting for drought tolerance under water restriction. Repositório Alice
VERONEZE JÚNIOR, V.; MARTINS, M.; MC LEOD, L.; SOUZA, K. R. D.; SANTOS FILHO, P. R.; MAGALHAES, P. C.; CARVALHO, D. T.; SANTOS, M. H.; SOUZA, T. C..
It is a fact that the regions that cultivate the most maize crop do not have fully adequate technologies to measure productivity losses caused by irregularities in water availability. The objective of this study was to evaluate the physiological characteristics of maize hybrids tolerant (DKB 390) and sensitive (BRS 1030) to drought, at V5 growth stage and under water restriction, in order to understand the mechanisms involved in the induction of tolerance to drought by chitosan in contrasting maize genotypes. Plants were cultivated in pots at a greenhouse, and chitosan 100 ppm was applied by leaf spraying. The water restriction was imposed for 10 days and then leaf gaseous exchange and chlorophyll fluorescence were evaluated. The tolerant hybrid (DKB 390)...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Estresse hídrico; Troca gasosa; Têmpera; Fluorescência da clorofila; Zea Mays.
Ano: 2019 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1113902
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Maize chlorophyll-a fluorescence analysis under water deficit with application of trehalose derivates mixture. Repositório Alice
SOUZA, T. C. de; AMBRÓSIO, A. dos S.; PORTUGAL, J. A. de N.; SOUZA, K. R. D. de; MAGALHAES, P. C.; SILVA, L. C da; DIAS, D. F.; SOUZA, T. B. de; CARVALHO, D. T..
bitstream/item/209304/1/Maize-chlorophyll.pdf
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Fotossistema; Milho; Seca; Dissacarídeo; Clorofila.
Ano: 2019 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1119126
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Physicochemical characterization of chitosan and its effects on early growth, cell cycle and root anatomy of transgenic and non-transgenic maize hybrids. Repositório Alice
MARTINS, M.; VERONEZE JÚNIOR, V.; CARVALHO, M.; CARVALHO, D. T.; BARBOSA, S.; DORIGUETTO, A. C.; MAGALHAES, P. C.; RIBEIRO, C.; SANTOS, M. H. dos; SOUZA, T. C. de.
The objectives of this study were to perform the physicochemical characterization of chitosan, to evaluate its effects on germination, early growth, root anatomy and on the cell cycle of two maize hybrids. The hybrids DKB 390 and DKB 390 VTPRO (transgenic) were used. DKB390 VTPRO is from Monsanto, and the event number is 89034, which expresses the proteins Cry1A105 and Cry2AB2. For the physico-chemical characterization of chitosan, the following analyzes were performed:, elemental analysis, total ash, infrared absorption spectroscopy, nuclear magnetic resonance, powder X-ray diffraction, thermogravimetric analysis, scanning electron microscopy and viscosity. With the analysis of infrared absorption spectroscopy, nuclear magnetic resonance, powder X-ray...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Quitosana; Milho; Hibrido; Propriedade Físico-Química.
Ano: 2018 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1105595
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The foliar application of a mixture of semisynthetic chitosan derivatives induces tolerance to water deficit in maize, improving the antioxidant system and increasing photosynthesis and grain yield. Repositório Alice
RABELO, V. M.; MAGALHAES, P. C.; BRESSANIN, L. A.; CARVALHO, D. T.; REIS, C. O.; KARAM, D.; DORIGUETTO, A. C.; SANTOS, M. H. dos; SANTOS FILHO, P. R. dos; SOUZA, T. C. de.
Research has shown that chitosan induces plant stress tolerance and protection, but few studies have explored chemical modifications of chitosan and their effects on plants under water stress. Chitosan and its derivatives were applied (isolated or in mixture) to maize hybrids sensitive to water deficit under greenhouse conditions through foliar spraying at the pre-flowering stage. After the application, water deficit was induced for 15 days. Analyses of leaves and biochemical gas exchange in the ear leaf were performed on the first and fifteenth days of the stress period. Production attributes were also analysed at the end of the experiment. In general, the application of the two chitosan derivatives or their mixture potentiated the activities of the...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Déficit hídrico; Quitosana; Milho.
Ano: 2019 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1111697
Registros recuperados: 5
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