Variation in and relationship between physical and physiological seed attributes within a soybean seed lot
1997
Illipronti, R.A. Jr. (Universidade Federal de Lavras (UFLA), Lavras-MG (Brazil). Departamento de Fitossanidade, Laboratorio de Patologia de Sementes) | Langerak, C.J. | Lommen, W.J.M.
This study aimed at increasing insight into the variation in physical and physiological seed quality attributes within a soybean (Glycine max (L.) Merrill) seed lot and on the relationships between them. Physical seed attributes were obtained non-destructively by image analysis (area, perimeter, length, width, shape-factor, eccentricity, and sphericity), weighing (weight), and visual classification (coat etching, cracking, colour, and wrinkling). Physiological seed attributes were evaluated by electrical conductivity (EC) and tetrazolium (TZ) tests. The coefficient of variation in EC was higher than in seed attributes measured by image analysis of weighing. Almost 40 % of the variation in EC could be explained by the occurrence of seed cracking, differences in seed size, and intensity of seed wrinkling. Some seed attributes were related: seeds with coat etching and cracking were larger than sound seeds, non-yellow seeds were smaller than yellow seeds, whereas seeds with both wrinkling and etching were rare. Different seed attributes were evaluated as being important by EC and TZ tests. Seed size attributes were not related to TZ test results, but influenced EC. Etching, cracking, colour, and wrinkling were related to TZ test results, but only cracking and wrinkling influenced EC. By expressing EC on a seed area basis, the seed size and weight effects were minimised and some effects of seed colour were observed
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