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Registros recuperados: 7
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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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Aspectos ecológicos de Cratylia argentea na região central de Minas Gerais. Repositório Alice
MATRANGOLO, W. J. R.; SILVA, I. H. F. da; ALMEIDA, L. G.; CRUZ, S. C. B; MALTA, P. da C. C.; GOMES, S. X..
Aspectos ecológicos de Cratylia argentea foram estudados na região Central de Minas Gerais para avaliar seu potencial em ofertar serviços ambientais aos sistemas agroecológicos. Durante as visitas às 13 unidades de observação/experimentação (UOE), ocorridas entre 2009 e 2017, foram feitos registros fotográficos, que permitiram caracterizar seus padrões fenológicos ao longo do ano, sua reação a fatores abióticos (fogo, estresse hídrico), bióticos (herbivoria de formigas Atta sp. e de abelhas Trigona sp.) e qualificar a presença de artrópodes e vertebrados em seu dossel. A diferenciação floral de C. argentea inicia-se no final do mês de fevereiro. As flores se abrem entre abril e outubro, com maior intensidade entre junho e agosto. C. argentea apresentou...
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Artrópode; Fenologia; Cerrado.
Ano: 2018 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1099001
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Chitosan application in the induction of water deficit tolerance in maize plants. Repositório Alice
ALMEIDA, L. G.; MAGALHAES, P. C.; KARAM, D.; SILVA, E. M. da; ALVARENGA, A. A..
The present research seeks to elucidate the feasibility of chitosan (CHT) in the induction of water deficit tolerance in different maize hybrids, contrasting tolerance to water restriction, tolerance and sensitivity. The maize plants were subjected to water deficit and foliar application of different chitosan doses (60, 100, 140, and 180 mg L-1) at the pre-flowering growth stage and evaluated during the stress period of fifteen days. To understand the induction behaviour of the tolerance to water restriction, biophysical parameters, such as water potential, relative water content and chlorophyll content, gas exchange, and biochemical assays, were quantified based on the activity of SOD, CAT, APX, and PAL antioxidant enzymes, lipid peroxidation activity and...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Antiperspirante; Estresse hídrico; Troca de gás; Enzima; Antioxidante; Milho.
Ano: 2019 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1116512
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Growth and biochemical responses of maize cultivated in soils contaminated with cadmium and zinc. Repositório Alice
ALMEIDA, L. G.; JORGE, A. de P.; SILVA, E. M. da; MAGALHAES, P. C.; SANTOS, H. R. B.; FARIAS, M. E. de; GUILHERME, L. R. G..
Contamination with trace elements is characterized by an abiotic stress that represents a limiting factor in agricultural production. Considering that cadmium (Cd) and Zinc (Zn) are physically and chemically similar, they can interact with the environment, causing antagonistic or synergistic effects. In this sense, physiological mechanisms to exclude, detoxify or compartmentalize the excess of those trace elements is crucial for the survival of the plants under conditions of high concentrations of these elements. In order to understand the responses of the species sensible to the presence of Cd and Zn, this study aimed to access the behavior of maize plants (Zea mays L.) cultivated in Cambisoils and Latosol with growing concentrations of Cd/Zn in a 21 days...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Sinergismo; Enzima; Bioquímica vegetal.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1081593
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Modifications in the root system, gas exchanges and productivity of sorghum hybrids cultivated under water deficit. Repositório Alice
SILVA, E. M. da; MAGALHAES, P. C.; CASTRO, E. M.; ÁVILA, R. G.; ALMEIDA, L. G..
This study associated data of performance, gas exchange and morphometric analysis of the root system using the WinRhizo software. The main objective was to verify how the modifications in the root system contribute to maintain the photosynthetic rates and productivity in sorghum hybrids divergent regarding tolerance to water deficit. The 1G 282 tolerant hybrid presented higher tolerance to desiccation of the leaves, higher grain productivity (68.33%) and maintained its photosynthetic rate 2.13 times higher compared to the sensitive BRS 332 during the water deficit. Both hybrids presented responses related to desiccation prevention, characterized by modifications of the root system that are capable to benefit absorption of water and nutrients under stress....
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: WinRhizo; Sorghum Bicolor; Raiz; Fotossíntese.
Ano: 2018 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1103420
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Osmorregulação e potencial hídrico foliar em híbridos de sorgo cultivados sob estresse hídrico. Repositório Alice
SCARASSATTI, T. V.; MAGALHAES, P. C.; CASTRO, E. M. de; AVILA, R. G.; ALMEIDA, L. G..
bitstream/item/182796/1/Osmorregulacao-potencial.pdf
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Seca; Prolina.
Ano: 2018 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1095511
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Root system of maize plants cultivated under water deficit conditions with application of chitosan. Repositório Alice
ALMEIDA, L. G.; SILVA, E. M. da; MAGALHAES, P. C.; KARAM, D.; REIS, C. O. dos; GOMES JÚNIOR, C. C.; MARQUES, D. M..
Low water availability is regarded as an abiotic stress that limits the agricultural production. Due to the physical and chemical characteristics of chitosan (CHT), this substance might stimulate physiological responses on plants with respect to water deficit tolerance. In this sense, maize plants were submitted to water deficit and leaf application of chitosan (140 mg/L) during pre-flowering stage. Two maize hybrids, presenting different water deficit tolerance levels, were used: DKB 390 (tolerant) and BRS1010 (sensitive). Evaluations of the root system and production components were conducted. Maize plants submitted to leaf application of chitosan at the dose of 140 mg/L presented specific behavior in regard to hybrids. The tolerant type presented a more...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Biopolimeros; Estresse hídrico; WinRhizo.
Ano: 2020 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1122454
Registros recuperados: 7
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