Physiological quality and imbibitions of soybean seeds with contrasting coats

Abstract

-The attributes that confer seed quality can largely be considered dependent on the coat. The aim of this study was to evaluate the quality and hydration pattern of the seeds of four contrasting soybean genotypes for the coats characteristics; BMX Potência RR and CD 202 with yellow coats and IAC and TP with black coats. The first stage of the study consisted of seed multiplication in the 2012/2013 harvest. After storage for five months at a temperature of 17 ºC and a relative humidity of 50%, the seeds were subjected to the following tests: germination, first count and seedling height, with and without immersion of the seeds, emergence in soil, emergence speed and germination index; electrical conductivity; thousand weight seeds and imbibitions of seeds. The design was completely randomized, with five replicates. The data was subjected to variance analysis and the means compared using the Tukey test at a 5% level of probability. Regression analysis was used for the seeds imbibitions test. Genotypes with black coats (especially IAC) presented better physiological quality in relation to genotypes with yellow coats. The latter had greater thousand weight seeds. BMX Potência RR presented greater hydration than the other genotypes in the first hours of imbibitions and TP, the least. Genotypes with black coats emitted a radicle faster than the yellow coats genotypes.Key words: Seed performance. Glycine max. Hydration. Thousand weight seeds.RESUMO -Os atributos que conferem a qualidade das sementes podem ser considerados, em grande parte, dependentes do tegumento. O objetivo do trabalho foi avaliar a qualidade e o padrão de hidratação das sementes de quatro genótipos de soja contrastantes para as características de tegumento; BMX Potência RR e CD 202, de tegumentos amarelos e, IAC e TP, de tegumentos pretos. A primeira etapa do estudo constou da multiplicação das sementes, na safra 2012/2013. Depois de cinco meses armazenadas à temperatura de 17 ºC e 50% de umidade relativa do ar, as sementes foram submetidas aos testes de germinação, primeira contagem e comprimento de plântula, com e sem imersão das sementes; emergência em solo; índice de velocidade de emergência e germinação; condutividade elétrica; massa de mil sementes e embebição das sementes. O delineamento foi o inteiramente casualizado, com cinco repetições. Os dados foram submetidos à análise de variância e as médias comparadas pelo teste de Tukey, ao nível de 5% de probabilidade. Para o teste de embebição das sementes aplicou-se análise de regressão. Genótipos de tegumento preto (em especial o IAC) apresentam maior qualidade fisiológica em relação aos de tegumento amarelo. Estes últimos possuem maior massa de mil sementes. BMX Potência RR apresenta hidratação maior que os outros genótipos nas primeiras horas de embebição e TP, a menor. Genótipos de tegumento preto emitem a radícula mais rápido que genótipos de tegumento amarelo.Palavras-chave: Desempenho de sementes. Glycine max. Hidratação. Massa de mil sementes.

Does the substrate affect the germination of soybean seeds treated with phytosanitary products?

“…For the seeds germinated between paper with preconditioning (BPC), there was no difference in seed germination counts for seeds treated with different phytosanitary products, as all of them presented high values, likely due to the lower water imbibition rate and, consequently, lower penetration and/or absorption of the chemical product into seeds and seedlings, especially in the initial imbibition stage since the seeds had low water contents at the test time (close to 9%). Ciência e Agrotecnologia, 44:e020119, 2020 Bahry et al (2017) evaluates the seed sensitivity of soybean cultivars to damage during imbibition in a germination test and verified that some cultivars responded positively to preconditioning, while others did not present positive responses. The water content in soybean seeds is an important characteristic that can affect the results obtained in germination tests using the standard paper procedure (paper roll).…”

Reserve mobilization in soybean seeds under water restriction after storage

“…The non-submission of seeds to pretreatment of imbibition can explain this result. As the water content of seeds was lower than 11%, possibly was an increase in the speed of water absorption (Sediyama-Bhering et al, 2015;Bahry et al, 2017). In the emergence test, the speed of water absorption is lower than in the germination test due to the direct contact with the substrate.…”

“…In the emergence test, the speed of water absorption is lower than in the germination test due to the direct contact with the substrate. Therefore, rapid uptake of water in the germination test can lead to the occurrence of damages in seeds and, consequently, reduction in the percentage of germination (Sediyama-Bhering et al, 2015;Bahry et al, 2017).…”

The Role of Plant Genotype, Culture Medium andAgrobacteriumon Soybean Plantlets Regeneration during Genetic Transformation

“…Successful seed germination has proved essential for many in vitro culture developments. This initial step has been reported by El-Kaaby et al [39] and Bahry et al [40] as a good indicator of seed viability and therefore, a determinant of the success to be achieved in plant tissue culture. According to the prescriptions by the International Seed Testing Association (ISTA), seeds should prove to be viable by ultimately achieving more than 60% overall germination percentage.…”