9 results on '"Siqueira, Gabriela Ferraz de"'
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2. A protective foliar complex boosts sugarcane quality and energy yield by reducing oxidative stress under drought
- Author
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Jacomassi, Lucas Moraes, primary, Momesso, Letusa, additional, Pacola, Marcela, additional, Viveiros, Josiane, additional, Siqueira, Gabriela Ferraz de, additional, Júnior, Osvaldo Araújo, additional, Campos, Murilo de, additional, and Crusciol, Carlos Alexandre Costa, additional
- Published
- 2023
- Full Text
- View/download PDF
3. A protective foliar complex boosts sugarcane quality and energy yield by reducing oxidative stress under drought.
- Author
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Jacomassi, Lucas Moraes, Momesso, Letusa, Pacola, Marcela, Viveiros, Josiane, Siqueira, Gabriela Ferraz de, Araújo Júnior, Osvaldo, Campos, Murilo de, and Crusciol, Carlos Alexandre Costa
- Abstract
Water stress negatively impacts plant morphology and physiology by inducing metabolic oxidative stress, which leads to cellular damage. Applying nutrients and/or organic molecules, such as amino acids, may mitigate the effects of drought stress. In the present study, the effects of a protective foliar complex (PFC) on late‐harvest sugarcane (Saccharum spp L.) (dry season) were evaluated. Four field experiments were carried out in commercial areas of sugarcane production in the central‐south region of Brazil using sugarcane variety CTC4: in the fourth and second ratoons in 2019 and in the fifth and third ratoons in 2020. The treatments consisted of foliar application or no application of the PFC at the beginning of the dry period in June. The PFC was applied at a dose of 10 L ha−1 in a water volume of 100 L ha−1. PFC application increased the activities of antioxidant enzymes (superoxide dismutase, peroxidase, and catalase) in sugarcane leaves. PFC application also reduced leaf levels of malondialdehyde and hydrogen peroxide (H2O2). On average, PFC application increased sucrose accumulation by 2.26 and 1.74 Mg ha−1 in 2019 and 2020, respectively, indicating improved raw material quality. In addition, PFC application mitigated damage caused by drought, with average increases in stalk productivity of 10.7 and 7.6 Mg ha−1 in 2019 and 2020, respectively. The positive effects of PFC application on plant antioxidant enzymes enabled greater biomass accumulation and, in turn, higher energy cogeneration. Core Ideas: Protective foliar complex (PFC) application efficiently mitigates oxidative stress.Foliar PFC application increases sugarcane tolerance to drought.The physiological effects of PFC application increase sugarcane yields and industrial quality.PFC application favors energy cogeneration, even under water stress conditions. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
4. Aplicação de boro e maturadores na pré-colheita da cana-de-açúcar em início e final de safra
- Author
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Siqueira, Gabriela Ferraz de [UNESP], Universidade Estadual Paulista (Unesp), and Crusciol, Carlos Alexandre Costa [UNESP]
- Subjects
Plantas - Reguladores ,Lignina ,Invertase ,Cana-de-açúcar ,Maturação ,Sugar-cane - Abstract
Made available in DSpace on 2014-12-02T11:16:45Z (GMT). No. of bitstreams: 0 Previous issue date: 2014-03-24Bitstream added on 2014-12-02T11:21:40Z : No. of bitstreams: 1 000791297.pdf: 1848335 bytes, checksum: 85cf68793dae3a372222dfd097f4d5f2 (MD5) Objetivou-se, mediante o presente estudo, avaliar a eficácia da aplicação foliar de boro (B) associado, ou não, aos maturadores etil-trinexapac, etefon e sulfometuron metil na pré colheita da cana-de-açúcar, as alterações fisiológicas e suas implicações na qualidade e produtividade de colmos. O presente projeto foi composto de três subprojetos, sendo o primeiro abordando o uso de B associado ao etil-trinexapac, o segundo ao etefon e o terceiro ao sulfometuron metil. Para cada subprojeto foram conduzidos 4 experimentos em início e 4 em final de safra (2 locais e 2 anos), totalizando 12 experimentos em início de safra e 12 em final de safra, ou seja, 24 experimentos. Nos experimentos em início de safra, foi utilizada a variedade de cana-de-açúcar RB855453 (maturação precoce) nos dois locais e em final de safra foi utilizada a variedade SP80-3280 (maturação tardia) no Grupo Raízen e a variedade RB867515 (maturação média-tardia) no Grupo Tereos. Os tratamentos foram constituídos da aplicação dos maturadores etil-trinexapac, etefon, sulfometuron metil e do controle (maturação natural), associados à aplicação de B foliar. As doses empregadas foram, respectivamente, 200 g i.a. ha-1 (0,8 L p.c. Moddus ha-1), 480 g i.a. ha-1 (0,66 L p.c. Ethrel ha-1), 0,15 g i.a. ha-1 (0,20 g p.c. Curavial ha-1) e para o B, a dose foi 0,18 kg ha-1 (1060 g ácido bórico ha-1). Foram avaliados os parâmetros bioquímicos, biométricos, tecnológicos e nutricionais. Concluiu-se que a deficiência de B limita o acúmulo de sacarose em início e final de safra; a aplicação de maturadores em início de safra, isoladamente ou em associação ao B, possibilitou antecipação no corte da matéria-prima em cerca de 15 dias e o B aplicado isoladamente foi ainda mais eficiente, antecipando a maturação em cerca de 18 dias; em final de ... The aim, through this study, was to evaluate the effectiveness of foliar application of boron (B), associated or not to the ripeners trinexapac-ethyl, ethephon and sulfometuron methyl in pre harvest of sugarcane, the physiological changes and their implications on quality and stalk yield. This project was composed of three subprojects, the first evaluating the use of B associated with trinexapac-ethyl, the second to ethephon and the third to sulfometuron methyl. For each subproject 4 experiments were carried out at the early and at the late season (2 places and 2 years), so were 12 experiments at early season and 12 at late season, totaling 24 experiments. In the experiments at early season, was used the variety of sugarcane RB855453 (early ripening) in both locations and at late season was used the variety SP80-3280 (late ripening) in Raízen Group and variety RB867515 (middle-late season) in Tereos group. The treatments consisted in the application of the ripeners trinexapac-ethyl, ethephon, sulfometuron methyl and control (natural ripening) associated with the application of B. The doses used were, respectively, 200 g i.e. ha-1 (0,8 L c.p. Moddus ha-1), 480 g i.e. ha-1 (0,66 L c.p. Ethrel ha-1), 0,15 g i.e. ha-1 (0,20 g c.p. Curavial ha-1) and for B the dose was 0,18 kg ha-1 (1060 g boric acid ha-1). Biochemical, biometric, technological and nutritional parameters were evaluated. It was concluded that B deficiency in pre-harvest of sugarcane limits the accumulation of sucrose at early and at late season; at early season the ripeners applied alone or in association with B enabled anticipation in the raw material harvesting in about 15 days and B applied alone was even more efficient, anticipating in about 18 days; at late season the ripeners were effective in maintaining the high sucrose concentration longer than control treatment, as well as B applied alone or in association with ...
- Published
- 2014
5. Plant regulators and invertase activity in sugarcane at the beginning of the harvest season
- Author
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Leite, Glauber Henrique Pereira, primary, Alexandre, Carlos, additional, Crusciol, Costa, additional, Siqueira, Gabriela Ferraz de, additional, and Silva, Marcelo de Almeida, additional
- Published
- 2015
- Full Text
- View/download PDF
6. Caracterização física e química de acerolas provenientes de diferentes regiões de cultivo
- Author
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Brunini, Maria Amalia, Macedo, Naiara Barbosa, Coelho, Cristina Vieira, and Siqueira, Gabriela Ferraz de
- Subjects
quality ,caracterização físico-química ,physico-chemical characteristics ,West Indian cherry ,acerola ,qualidade - Abstract
Este trabalho teve por objetivo avaliar características físicas e químicas em acerolas provenientes de oito regiões do Estado de São Paulo. Os frutos foram colhidos de março a abril de 2003. Os dados foram avaliados em delineamento experimental inteiramente casualizado. Os resultados médios de peso por fruto variaram de 6,92g a 9,60g, e os oriundos de pomar situados em Guariba, Pioneiros e Guará foram os que apresentaram os maiores valores. As médias do índice de formato do fruto e do diâmetro transversal oscilaram de 0,86 a 1,24 e 2,02 a 2,37cm, respectivamente, e a coloração da casca foi mais vermelha nas acerolas oriundas de pomar de Bonfim Paulista e Aparecida do Salto. A textura dos frutos variou de 144,73 a 246,00 N.cm-2, e as acerolas colhidas em pomares de Bonfim Paulista, Aparecida do Salto e Guará apresentaram-se menos firmes. Os teores de sólidos solúveis totais variaram de 5,67 a 8,22ºBrix, sendo maiores em acerolas colhidas em pomar situado em Porto Ferreira e Guará. O pH variou de 2,39 a 4,00, a acidez total titulável de 0,504 a 1,112g de ácido málico por 100g de polpa e os de açúcares solúveis totais de 3,06 a 8,42g de glicose por 100g de polpa. As acerolas oriundas de pomares situados em Aparecida do Salto e Ituverava foram as que apresentaram os maiores valores de ácido ascórbico. The physical and chemical characteristics of West Indian cherry from 8 regions of cultivation in São Paulo state were evaluated by this paper. The fruits were harvested from March to April 2003. The results were evaluated in an experimental delineation totally randomized. The average results of weight varied from 3.56 to 7.29g and it was highest in West Indian cherry fruits harvested in orchards from Guariba, Guará and Pioneiros region. The average sharp index and diameter oscillated from 0.86 to 1.24 and 2.02 to 2.37cm, respectively. The West Indian cherry fruits from orchards situated in Bonfim Paulista and Aparecida do Salto presented the highest red color. The fruit firmness varied from 144.73 to 246.00 N.cm-2, and the fruits harvested in orchards situated in Bonfim Paulista, Aparecida do Salto and Guará region presented the smallest fruits firmness. The ºBrix ranged from 5.67 to 8.22, and it was highest in West Indian cherry fruits harvested in orchards from Porto Ferreira and Guará region suggesting a small potential for postharvest conservation. The pH varied from 2.39 to 4.00, the titrable acidity, expressed as g of malic acid per 100g, ranged from 0.504 to 1.112 and the soluble sugar content ranged from 3.06 to 8.42g of glicose per 100g. The West Indian cherry fruits harvested in orchards situated in Bonfim Paulista, Aparecida do Salto and Ituverava region showed the highest ascorbic acid value.
- Published
- 2004
7. Influência de formato de corte e ácido ascórbico em melão minimamente processado
- Author
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Brunini, Maria Amalia, Oliveira, Antônio Luís de, Siqueira, Gabriela Ferraz de, Coelho, Cristina Vieira, Silva, Rosa Diniz da, Brunini, Maria Amalia, Oliveira, Antônio Luís de, Siqueira, Gabriela Ferraz de, Coelho, Cristina Vieira, and Silva, Rosa Diniz da
- Abstract
The aim of the present work was to evaluated the influence of three types of cut shape preparation (cube, slice and retail) on the conservation of minimally processed products of yellow 'Valenciano' melon, treated or no with ascorbic acid solution at 1%. After preparation, the products were conditioned into terephthlate polyethylene trays covered with a stretchable polyvinyl chloride (PVC) film with 0.014mm of thickness, and stored at 8 1°C with 85-90% R.U. Every two days, the minimally products were evaluated with regarding to soluble carbohydrates content, solids soluble content and titrable acidity relation, pulp darkening, rotness development and sensorial characteristics. The cut shape permited obtain minimally product with good acceptance until seven days of storage, the sensorial acceptance was similar to all minimally products, independent of cuting and use of ascorbic acid solution; the soluble carbohydrate and pulp darkening were influenced by cut shap and treatment with ascorbic acid solution at 1%., O objetivo deste trabalho foi avaliar o efeito de formato de corte (cubo, fatia e retalho) na conservação de produtos minimamente processados de melão 'Valenciano' amarelo, tratados ou não com solução de ácido ascórbico a 1%. Após o preparo, os produtos minimamente processados foram acondicionados em bandejas de polietileno tereftalato, revestidas externamente com filme plástico de PVC de 0,014mm de espessura, e armazenados a 8±1ºC, com 85% a 95% de UR. A cada 2 dias, os produtos minimamente processados foram avaliados quanto aos teores de carboidratos solúveis, relação sólidos solúveis totais e acidez total titulável, escurecimento, desenvolvimento de podridão e características sensoriais. Os tipos de formato de corte empregados no processamento mínimo de melão permitiram produtos com boa aceitabilidade até o sétimo dia de armazenamento a 8±1ºC; a aceitação sensorial foi semelhante para todos os produtos minimamente processados, independentemente do tratamento ou não com solução de ácido ascórbico 1%; os teores de carboidratos solúveis e a coloração da polpa foram influenciados pelo formato de corte e tratamento com solução de ácido ascórbico a 1%.
- Published
- 2004
8. Qualidade tecnológica em diferentes porções do colmo e produtividade da cana-de-açúcar sob efeito de maturadores
- Author
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Leite, Glauber Henrique Pereira, primary, Crusciol, Carlos Alexandre Costa, additional, Siqueira, Gabriela Ferraz de, additional, and Silva, Marcelo de Almeida, additional
- Published
- 2010
- Full Text
- View/download PDF
9. Caracterização física e química de acerolas provenientes de diferentes regiões de cultivo
- Author
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Brunini, Maria Amalia, primary, Macedo, Naiara Barbosa, additional, Coelho, Cristina Vieira, additional, and Siqueira, Gabriela Ferraz de, additional
- Published
- 2004
- Full Text
- View/download PDF
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