This research was performed to evaluate the effect of size grading on the physiological potential of soya bean seeds and the influence of water availability on the germination of different size classes. Two seed lots of 'M7739IPro' were classified by thickness in metal sheet screens
with rectangular openings. The seed size classes (control and seeds held in the M + 0.8 mm, M, M - 0.8 mm and < M - 0.8 mm openings, M representing medium seed size) were evaluated by germination, vigour (saturated salt accelerated aging, seedling growth, seedling computerised image analysis
and tetrazolium staining), seedling emergence and 1000 seed weight tests. The imbibition and germination performance of sized seeds under variations in substrate water potential (-0.04, -0.10, -0.20 and -0.40 MPa) was evaluated. Results showed that the establishment of medium size as a reference
is fundamental for identifying relations between seed size and physiological potential. Seeds smaller by more than 0.8 mm than the medium size of the lot have lower physiological potential but are more tolerant to water deficit. Thus, it is recommendable to use seeds within the size limits
of M ± 0.8 mm, to constitute soya bean seed lots of higher physiological potential.
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Document Type: Research Article
December 1, 2018
This article was made available online on October 15, 2018 as a Fast Track article with title: "Relationship between size and physiological potential of soya bean seeds under variations in water availability".
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