Individual electrical conductivity test for the assessment of soybean seed germination

Abstract

Soybean seed quality is affected by many factors, which may occur during the production, processing, and storage phases. To ensure the quality of seeds, the adoption of fast and efficient methods to estimate seed viability in quality control programs is important. This study aimed to determine a partition point of the individual electrical conductivity test to predict soybean seed germination. Three lots each of five different soybean cultivars (Fundacep 57 RR, BMX Potência RR, BMX Força RR, BMX Turbo RR, and Nidera 7321 RG) were used. Seed quality was assessed through the mass of 1,000 seeds (MTS), moisture content (MC), germination test (G), bulk electrical conductivity (BEC), individual electrical conductivity (IEC), accelerated ageing (AA), and field seedling emergence (FSE). To determine a partition point in the IEC test for predicting germination, seeds were subjected to the germination test in the same position used for the IEC test. The accuracy of the partition point was tested by comparing predicted germination with the standard germination test. The partition point obtained for normal seeds was 130 µS .cm -1 .seed -1 . The IEC test, however, had limitations in predicting soybean seed germination. The data for predicted germination were different from those obtained by the standard test, because the characteristics of each lot led to differences in the electrical conductivity values. Key words: Glycine max (L.) Merrill, partition point, fast test, seed quality ResumoA qualidade das sementes de soja pode ser afetada por inúmeros fatores que podem ocorrer em qualquer etapa da produção. Para garantir a qualidade das sementes é necessária a adoção testes rápidos e eficientes em estimar a viabilidade das sementes. O objetivo desse estudo foi determinar o ponto de partição do teste de condutividade elétrica individual (CEI) para estimar a germinação de sementes de soja. Foram utilizados 15 lotes pertencentes a diferentes cultivares (Fundacep 57 RR, BMX Potência RR, BMX Força RR, BMX Turbo RR, e Nidera 7321 RG). A caracterização dos lotes foi efetuada pelo peso de mil sementes, teor de água, germinação, condutividade elétrica massal e individual, envelhecimento acelerado e emergência a campo. Para determinação do ponto de partição as sementes foram submetidas ao teste padrão de germinação, respeitando-se a posição utilizada na leitura da CEI. A veracidade do

Massal and Individual Electrical Conductivity Tests and its Relationships with the Physiological Quality of Sweet Sorghum Seeds

“…at a constant temperature of 25 º C and the readings performed in six imbibition periods (2,4,6,8,12 and 24 hours) for each lot and cultivar. The results were expressed in μS cm -1 seed -1 (Mattioni et al 2015).…”

“…Tests that evaluate seeds vigor provide more sensitive indexes when compared to the traditional germination test (AOSA, 1983). The electrical conductivity test has been used to evaluate the seeds vigor, potential of emergence and storage of species such as soybean and wheat (Mattioni et al 2015, Mertz et al 2012). However, the results can be affected by some factors such as: characteristics of the seed itself (size and genotype, mechanical damage, insect injury); imbibition temperature, chemical treatment; degree of moisture, quality and volume of water (Vieira & Krzyzanowski, 1999, Marcos Filho, 2015.…”

“…Steere et al (1981) proposed the determination of individual electric conductivity of seeds, which was developed to correct problems existing in the mass evaluation, especially in samples that contain damaged seeds or that present variations in the leaching capacity. Through this test, it was possible to classify lots of different vigor levels according to the physiological quality, as well as to determine the germination estimation on an efficient way (Mattioni et al 2015). Although this test has already been well establish for many cultures, there are some lacking information about its application for Sorghum bicolor.…”

Perilaku Biokimia Benih Kedelai Selama Penyimpanan dalam Kondisi Terkontrol

“…Pola peningkatan daya hantar listrik kedua varietas berbeda, varietas Gepak Kuning berjalan lebih lambat dan mulai terlihat pada minggu ke-12, sedangkan peningkatan daya hantar listrik varietas Mallika berjalan lebih cepat sejak minggu ke-4. Perbedaan nilai dan kecepatan peningkatan daya hantar listrik dipengaruhi oleh varietas dan vigor awal benih (Mattioni et al, 2015). Vigor awal simpan Mallika lebih rendah (85%) dibandingkan Gepak Kuning (92.75%).…”

Electrical conductivity of coffee seeds in function of the number of seeds and imbibing period

“…The germination test is the official and standard procedure to evaluate seed capacity to produce a normal plant under ideal conditions. However, the extended time required to obtain the results constitutes a disadvantage for such procedure (MATTIONI et al, 2015). This happens especially in coffee seeds (Coffea arabica L.) which show uneven and slow germination rate and generally have a low conservation potential for storage, increasing seed exposure to adverse conditions of the environment, which may affect its vigor and survival (CLEMENTE et al, 2015).…”