Attenuation of salt stress by lycopene on common bean seeds

Salinity is a major abiotic stress that adversely affects several physiological and biochemical aspects of plants. Antioxidants can be used as a potential remediation mechanism to promote plant resilience. Therefore, the objective of the present study was to evaluate increasing doses of the antioxidant lycopene on the germination and initial growth of common bean seedlings under conditions of salt stress. Seeds were treated with the following lycopene concentrations: 0.018; 0.036; 0.072; 0.144; and 0.288 g L-1 and two controls (negative and positive) and evaluated under two growth conditions (without and with salt stress) for physiological quality and pigment content. Data were analyzed by completely randomized design, in 2 x 7 factorial (two growth conditions, with paper towel moistened with water or salt solution x seven treatments, including five lycopene doses and two controls), in four replicates of 50 seeds by concentration. With the results of the analysis of variance, growth conditions (without and with salt stress) were compared by the Tukey test (5%), and the effects of lycopene doses were analyzed by polynomial regression. Lycopene promoted tolerance of bean seeds to salt stress and had a positive influence on the attenuation of salt harmful effects to the initial growth of seedlings, mainly at the doses of 0.072 g L-1 and 0.144 g L-1.(AU)

Attenuation of salt stress by lycopene on common bean seeds / Attenuation of salt stress by lycopene on common bean seeds

Salinity is a major abiotic stress that adversely affects several physiological and biochemical aspects of plants. Antioxidants can be used as a potential remediation mechanism to promote plant resilience. Therefore, the objective of the present study was to evaluate increasing doses of the antioxidant lycopene on the germination and initial growth of common bean seedlings under conditions of salt stress. Seeds were treated with the following lycopene concentrations: 0.018; 0.036; 0.072; 0.144; and 0.288 g L-1 and two controls (negative and positive) and evaluated under two growth conditions (without and with salt stress) for physiological quality and pigment content. Data were analyzed by completely randomized design, in 2 x 7 factorial (two growth conditions, with paper towel moistened with water or salt solution x seven treatments, including five lycopene doses and two controls), in four replicates of 50 seeds by concentration. With the results of the analysis of variance, growth conditions (without and with salt stress) were compared by the Tukey test (5%), and the effects of lycopene doses were analyzed by polynomial regression. Lycopene promoted tolerance of bean seeds to salt stress and had a positive influence on the attenuation of salt harmful effects to the initial growth of seedlings, mainly at the doses of 0.072 g L-1 and 0.144 g L-1.

Salinity is a major abiotic stress that adversely affects several physiological and biochemical aspects of plants. Antioxidants can be used as a potential remediation mechanism to promote plant resilience. Therefore, the objective of the present study was to evaluate increasing doses of the antioxidant lycopene on the germination and initial growth of common bean seedlings under conditions of salt stress. Seeds were treated with the following lycopene concentrations: 0.018; 0.036; 0.072; 0.144; and 0.288 g L-1 and two controls (negative and positive) and evaluated under two growth conditions (without and with salt stress) for physiological quality and pigment content. Data were analyzed by completely randomized design, in 2 x 7 factorial (two growth conditions, with paper towel moistened with water or salt solution x seven treatments, including five lycopene doses and two controls), in four replicates of 50 seeds by concentration. With the results of the analysis of variance, growth conditions (without and with salt stress) were compared by the Tukey test (5%), and the effects of lycopene doses were analyzed by polynomial regression. Lycopene promoted tolerance of bean seeds to salt stress and had a positive influence on the attenuation of salt harmful effects to the initial growth of seedlings, mainly at the doses of 0.072 g L-1 and 0.144 g L-1.

Banana fertigation with treated sanitary wastewater: postharvest and microbiological quality / Fertirrigação da bananeira com água residuária sanitária tratada: qualidade pós-colheita e microbiológica

Sewage may serve as a source of water and nutrients for plants. In this study, the effects of fertigation with treated sanitary wastewater from Janaúba Sewage Treatment Plant were evaluated on the postharvest and microbiological quality of ‘Prata-An㒠banana. A randomized block experimental design was used. Four concentrations of wastewater were tested (70, 130, 170, and 200% of 150 kg ha-1 sodium). A wastewater-free control treatment was used for comparison. Two crop cycles were assessed for postharvest and microbiological quality. The parameters measured included total soluble solids, titratable acidity, total soluble solids/titratable acidity ratio, pH, total coliforms, and fecal coliforms on both the peel and the pulp. In the first crop cycle, both soluble solids and fruit pulp pH decreased as wastewater level increased up to a maximum of 141.5%. These correlations were not observed in the second cycle. Wastewater management did not affect the titratable acidity of the soluble solids. The agricultural application of treated sanitary wastewater provided banana fruits with a microbiological profile similar to that obtained with the control (pure water) and with mineral fertilizers. A microbial balance is necessary to maintain the nutritional status of the banana crop.

A utilização de água residuária proveniente do tratamento de esgoto, como fonte hídrica e nutricional para as plantas, é uma alternativa para racionalizar o aproveitamento do recurso natural na agricultura. O objetivo desse trabalho foi avaliar os efeitos da aplicação da água residuária sanitária de tratamento secundário da Estação de Tratamento de Esgoto de Janaúba – MG sobre a qualidade pós-colheita e microbiológica da bananeira ‘Prata-Anã’. O experimento foi conduzido no delineamento de blocos casualizados. As doses de água residuária testadas foram equivalentes a 70, 130, 170 e 200% do limite máximo de 150 kg ha-1 sódio que pode ser aportado ao solo. Para efeito de comparação foi conduzido também um tratamento testemunha, irrigado com água limpa. Durante dois ciclos produtivos da cultura determinaram-se os seguintes atributos pós-colheita da banana: sólidos solúveis totais, acidez total titulável, relação sólidos solúveis totais/acidez titulável e o pH. Para a análise microbiológica foram coletados frutos em cada ciclo produtivo da cultura, quando se quantificou a presença de coliformes totais e coliformes termotolerantes na casca e na polpa das bananas. No primeiro ciclo de produção da bananeira, o teor de sólidos solúveis dos frutos decresce com o aumento no aporte de água residuária sanitária tratada até o limite de 141,5%, havendo também redução do pH dos frutos, porém, tal fenômeno não é verificado no segundo ciclo. A relação sólidos solúveis:acidez titulável e a acidez titulável não são influenciadas pelo manejo com água residuária sanitária tratada. Considerando o grupo de microrganismos avaliados e tendo em vista a manutenção do equilíbrio do estado nutricional da cultura, o reúso agrícola da água residuária sanitária tratada permite a obtenção de frutos de banana com qualidade microbiológica semelhante àqueles obtidos pelo manejo com água limpa e fertilizantes minerais.

Banana fertigation with treated sanitary wastewater: postharvest and microbiological quality / Fertirrigação da bananeira com água residuária sanitária tratada: qualidade pós-colheita e microbiológica

Sewage may serve as a source of water and nutrients for plants. In this study, the effects of fertigation with treated sanitary wastewater from Janaúba Sewage Treatment Plant were evaluated on the postharvest and microbiological quality of ‘Prata-Anã banana. A randomized block experimental design was used. Four concentrations of wastewater were tested (70, 130, 170, and 200% of 150 kg ha-1 sodium). A wastewater-free control treatment was used for comparison. Two crop cycles were assessed for postharvest and microbiological quality. The parameters measured included total soluble solids, titratable acidity, total soluble solids/titratable acidity ratio, pH, total coliforms, and fecal coliforms on both the peel and the pulp. In the first crop cycle, both soluble solids and fruit pulp pH decreased as wastewater level increased up to a maximum of 141.5%. These correlations were not observed in the second cycle. Wastewater management did not affect the titratable acidity of the soluble solids. The agricultural application of treated sanitary wastewater provided banana fruits with a microbiological profile similar to that obtained with the control (pure water) and with mineral fertilizers. A microbial balance is necessary to maintain the nutritional status of the banana crop.(AU)

A utilização de água residuária proveniente do tratamento de esgoto, como fonte hídrica e nutricional para as plantas, é uma alternativa para racionalizar o aproveitamento do recurso natural na agricultura. O objetivo desse trabalho foi avaliar os efeitos da aplicação da água residuária sanitária de tratamento secundário da Estação de Tratamento de Esgoto de Janaúba MG sobre a qualidade pós-colheita e microbiológica da bananeira ‘Prata-Anã. O experimento foi conduzido no delineamento de blocos casualizados. As doses de água residuária testadas foram equivalentes a 70, 130, 170 e 200% do limite máximo de 150 kg ha-1 sódio que pode ser aportado ao solo. Para efeito de comparação foi conduzido também um tratamento testemunha, irrigado com água limpa. Durante dois ciclos produtivos da cultura determinaram-se os seguintes atributos pós-colheita da banana: sólidos solúveis totais, acidez total titulável, relação sólidos solúveis totais/acidez titulável e o pH. Para a análise microbiológica foram coletados frutos em cada ciclo produtivo da cultura, quando se quantificou a presença de coliformes totais e coliformes termotolerantes na casca e na polpa das bananas. No primeiro ciclo de produção da bananeira, o teor de sólidos solúveis dos frutos decresce com o aumento no aporte de água residuária sanitária tratada até o limite de 141,5%, havendo também redução do pH dos frutos, porém, tal fenômeno não é verificado no segundo ciclo. A relação sólidos solúveis:acidez titulável e a acidez titulável não são influenciadas pelo manejo com água residuária sanitária tratada. Considerando o grupo de microrganismos avaliados e tendo em vista a manutenção do equilíbrio do estado nutricional da cultura, o reúso agrícola da água residuária sanitária tratada permite a obtenção de frutos de banana com qualidade microbiológica semelhante àqueles obtidos pelo manejo com água limpa e fertilizantes minerais.(AU)