Desempenho fisiológico de sementes de gergelim submetidas a estresse hídrico em diferentes temperaturas

Medeiros, Décio; Alves, Edna Ursulino; Sena, Daniela Vieira dos Anjos; Silva, Edna de Oliveira; Araújo, Luciana Rodrigues de

doi:10.5433/1679-0359.2015v36n5p3069-3076

Cited by 2 publications

(2 citation statements)

References 2 publications

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“…Therefore, the high concentration of salt present in cells can inactivate enzymes, hinder protein synthesis and prevent seed germination (TAIZ and ZEIGER, 2013). Thus, as saline concentrations become more negative, water restriction seems to reduce the velocity index (Figure 3) and the percentage of first count and germination (Figure 1 and 2), as it affects the rate of metabolic processes and biochemicals, delaying or inhibiting seed germination, interfering with water absorption and probably cell division (MEDEIROS et al, 2015).…”

Section: Resultsmentioning

confidence: 99%

Hybrid and native sesame seeds subjected to salinity

Melo¹,

Berto²,

Melo³

et al. 2023

CLCS

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Sesame is a plant with great economic and social potential, being used for various purposes such as the food, pharmaceutical, medicinal industries, and more recently, as a source of renewable energy for the production of biofuel. One of the factors that most limit the productivity of this crop is salt stress. Based on this, the present work aimed to evaluate the germination and vigor of hybrid and creoles sesame seeds subjected to saline stress. The experiment was carried out at the Phytotechnics Laboratory of the Engineering and Agricultural Sciences Campus/UFAL. Two sesame cultivars were studied, BRS Anahí and Creole from the state of Sergipe. The seeds were aseptically treated by immersion in 70% alcohol for 1 minute, followed by washing in running water before being subjected to the treatments. To simulate salt stress, sodium chloride (NaCl) was used as a solute at concentrations of 0.0 (control); -0.1; -0.2; -0.3; -0.4 and -0.5 MPa. The material was placed, Biochemical Oxygen Demand (B.O.D.) germination type chamber, regulated at an alternate temperature of 20-30 °C. The experimental design used was completely randomized, with four replications of 25 seeds per treatments in a 2 x 6 factorial scheme (sesame cultivars x saline concentrations). Data were submitted to analysis of variance and polynomial regression, and the analyzes were performed using the SISVAR 5.6 software. The parameters evaluated were: water content, germination, first germination count, germination speed index, seedling length and dry mass. The results for the germination of sesame seeds submitted to salt stress showed that as the salinity levels increased there was a reduction in the percentage of germination of the sesame seeds studied, but until the concentration of -0.4 MPa they are within the standards allowed for commercialization of that culture. In the first count of germination, the Creoles sesame seeds showed the highest values, demonstrating better germination performance compared to BRS Anahí. In the germination speed index, BRS Anahí outperformed Creoles in all salt concentrations, except for the control. For seedling length, it was found that at the lowest salt concentrations both sesame varieties obtained the highest averages, with a significant reduction in length at the highest concentration (-0.5). The dry mass of the seedlings decreased as the water salinity increased, being more evident after the -0.3 MPa NaCl solution, especially for BRS Anahí. Thus, it can be concluded that salinity affects the physiological potential of sesame seeds, being more evident when at salt concentrations from -0.3 MPa. Creoles sesame seeds are less sensitive to saline stress.

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Section: Resultsmentioning

confidence: 99%

Hybrid and native sesame seeds subjected to salinity

Melo¹,

Berto²,

Melo³

et al. 2023

CLCS

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“…Research Temperaturas acima do ótimo considerado para a cultura podem comprometer o processo de retomada de crescimento do embrião, resultando em efeitos drásticos no desenvolvimento inicial das plântulas, quando associada ao déficit hídrico (Carvalho & Nakagawa, 2012;Taiz & Zeiger, 2013). A alta temperatura influência na absorção de água, no limite e velocidade das reações bioquímicas e nos processos fisiológicos das sementes, comprometendo o processo germinativo (Medeiros et al, 2015).…”

Section: Wpa (Mgunclassified

Desempenho fisiológico e bioquímico de cultivares de cevada sob estresse por restrição hídrica em diferentes temperaturas

Rolim

Martins

Rosa

et al. 2023

RSD

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Este trabalho teve como objetivo avaliar a influência da restrição hídrica e de diferentes temperaturas no desempenho fisiológico e bioquímico de plântulas de cevada. O trabalho foi dividido em dois estudos. Primeiramente, foram testados potenciais osmóticos para simular a restrição hídrica em sementes de cevada, submetidas a diferentes temperaturas. O experimento foi conduzido em condições controladas nas temperaturas de 20 e 35 ºC. O delineamento estatístico utilizado foi inteiramente casualizado, em esquema fatorial 11 (cultivares) x 5 (potenciais osmóticos), com quatro repetições. Avaliou-se a primeira contagem de germinação, germinação e massa seca de plântulas. A partir do estudo I, realizou-se a seleção de duas cultivares com melhor desempenho e de uma com pior desempenho. Após, iniciou-se os experimentos do segundo estudo. O delineamento experimental utilizado foi o inteiramente casualizado, em esquema fatorial 3 (cultivares) x 5 (potenciais osmóticos), com quatro repetições. Avaliou-se a atividade enzimática antioxidante, peróxido de hidrogênio, peroxidação lipídica, açúcares solúveis totais e aminoácidos. O estresse por restrição hídrica, associado ou não a alta temperatura, afetou a germinação, vigor e crescimento inicial das cultivares. Quando submetidas a restrição hídrica e a 35 ºC as plântulas apresentaram teores elevados de enzimas, peróxido de hidrogênio, peroxidação lipídica, aminoácidos e açúcares solúveis totais.

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Desempenho fisiológico de sementes de gergelim submetidas a estresse hídrico em diferentes temperaturas

Cited by 2 publications

References 2 publications

Hybrid and native sesame seeds subjected to salinity

Hybrid and native sesame seeds subjected to salinity

Desempenho fisiológico e bioquímico de cultivares de cevada sob estresse por restrição hídrica em diferentes temperaturas

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