Qualidade fisiológica de sementes de melão pepino sob salinidade crescente da água de irrigação

Nóbrega, Jackson Silva; Figueiredo, Francisco Romário Andrade; Nascimento, Rodrigo Garcia Silva; Bruno, R. de L. A.; Alves, Edna Ursulino; Cavalcante, Lourival Ferreira

doi:10.19084/rca18146

Cited by 3 publications

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“…The effects of excessive accumulation of soluble salts on plants can lead to physiological drought, caused by the decrease in osmotic potential; nutritional imbalance, due to a high concentration of ions, especially sodium, which inhibits the absorption of other nutrients; increased toxicity of specific ions; and interference with different physiological processes (Sousa et al, 2018). Responses are variable and directly related to the species, types of salts present in the water, as well as the intensity and duration of the salt stress to which the seed is subjected (Nóbrega et al, 2018).…”

Section: Methodsmentioning

confidence: 99%

Germinação de sementes de Amaranthus deflexus L. submetidas a diferentes condições de tempera-tura e estresse salino

et al. 2023

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As plantas daninhas competem com as culturas por fatores limitantes do meio em que vivem, portanto, estudos que apontem a resposta germinativa de sementes submetidas a estresses artificiais são importantes para entender a capacidade de sobrevivência e adaptação destas espécies sob condições de estresse naturais. Objetivou-se neste trabalho avaliar o efeito das condições salinas e térmicas sobre a germinação e vigor de sementes de Amaranthus deflexus L. Foram instalados dois experimentos, com semeadura realizada em placas de petri contendo duas folhas de papel de filtro umedecidas com água destilada (controle) ou com soluções de NaCl. No experimento 1 utilizou-se o delineamento experimental inteiramente casualizado (DIC), em esquema fatorial 2 x 6, constituído de dois fotoperíodos (12h luz e 24h escuro) e seis níveis de estresse salino (0; -0,3; -0,6; -0,9; -1,2 e -1,5 MPa), totalizando doze tratamentos, com quatro repetições. Ao final do teste, as sementes que não germinaram foram lavadas e colocadas em substrato papel toalha, umedecido com água para hidratação e estimular o processo germinativo. No experimento 2 utilizou-se um DIC com oito tratamentos (germinação sob 20; 25; 30; 35; 40°C, 20/30; 25/35 e 30/40°C) e quatro repetições cada. O estresse salino afetou negativamente o vigor das sementes de A. deflexus desde o nível de estresse de -0,3 MPa. O vigor das sementes foi comprometido pela ausência de luz, independentemente dos níveis de estresse aplicados. Houve superioridade na percentagem final de germinação e o índice de velocidade de germinação das sementes de A. deflexus na temperatura de 25°C constante e no regime alternado de 25-35°C. O procedimento multivariado discriminou os tratamentos 1 e 2 como superiores no dendograma A, bem como 4, 5 e 6 no dendograma B, configurando-se como método robusto para inferência em experimentos fatoriais sobre o comportamento germinativo.

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Section: Methodsmentioning

confidence: 99%

Germinação de sementes de Amaranthus deflexus L. submetidas a diferentes condições de tempera-tura e estresse salino

et al. 2023

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Acúmulo de biomassa e pigmentos fotossintéticos em plantas de Mesosphaerum suaveolens (L.) Kuntze sob estresse salino e doses de ácido salicílico

Nóbrega

Bruno

Figueiredo

et al. 2020

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Mesosphaerum suaveolens (L.) is a species with high aromatic and therapeutic potential, widespread in the Northeast of Brazil. However, the conditions of the northeastern semiarid and the high content of salts contained in the soil and water used for irrigation may compromise plant development. Thus, the objective of this study was to evaluate the effect of salicylic acid as a saline stress attenuator on biomass accumulation and chlorophyll indices in M. suaveolens plants. The experiment was conducted in a protected environment belonging to the Center for Agricultural Sciences, Federal University of Paraíba, Areia-PB. The statistical design adopted was randomized blocks in incomplete 5 x 5 factorial scheme, with five electrical conductivities of irrigation water (ECw: 0.5; 1.45; 5.0; 8.55 and 10.0 dS m-1) and five doses of salicylic acid (0.0, 0.29, 1.0, 1.71 and 2.0 mM L-1) with four replications and two plants per plot, generated from the experimental Box Central Compound matrix. Dry matter accumulation of root, stem, leaves, shoot and total and chlorophyll indices ‘a’, ‘b’, total and chlorophyll a/b ratio were evaluated. Salinity caused serious damage, considerably reducing biomass accumulation and chlorophyll leaf indices of M. suaveolens plants. Salicylic acid did not mitigate the damage caused by salt stress.

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Potencial fisiológico de sementes de melão pepino submetidas a salinidade

Nóbrega

Lopes

Paiva

et al. 2020

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The cultivation of melon is one of the main agricultural activities in Northeast Brazil, adapting well to the environmental conditions of the region. Local varieties, also called creoles, are widely used in domestic consumption, including cucumber melons. However, one of the limiting factors for agricultural production in the region is the salinity of the soils and water used for irrigation, directly interfering with the germination process of the seeds. In this context, the objective was to evaluate the influence of salinity on the germination and evolution of the imbibition process of cucumber melon seeds. The experiment was conducted in a completely randomized design with five electrical conductivities of irrigation water (ECw = 0.0; 0.5; 1.5; 3.5 and 4.5 dS m-1), with four replications of 50 seeds. The seed water absorption and increment curve and the percentage, first count, average speed index, average time, average speed and relative germination frequency were evaluated. The data were submitted to analysis of variance and, in cases of significance, regression analysis. The cucumber melon is tolerant to salinity, but the vigor of the seeds is reduced with the increase of CEa. The water absorption lasts for 41 hours and the increment of 0.013 g of water per seed until root protrusion begins. In the evolution of the imbibition of the seeds, an extension of the duration of the process was observed with the increase of the saline concentrations.

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Qualidade fisiológica de sementes de melão pepino sob salinidade crescente da água de irrigação

Cited by 3 publications

References 0 publications

Germinação de sementes de Amaranthus deflexus L. submetidas a diferentes condições de tempera-tura e estresse salino

Germinação de sementes de Amaranthus deflexus L. submetidas a diferentes condições de tempera-tura e estresse salino

Acúmulo de biomassa e pigmentos fotossintéticos em plantas de Mesosphaerum suaveolens (L.) Kuntze sob estresse salino e doses de ácido salicílico

Potencial fisiológico de sementes de melão pepino submetidas a salinidade

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