Germination test under water stress to evaluate soybean seed vigour
The objective of the present study was to assess the physiological quality of soybean seeds by the germination test under water stress and correlate the results of this methodology with other vigour tests available for soybean seeds. Seeds of six soybean cultivars were evaluated by the following tests: seedling emergence in the field, standard germination (first and final count), seedling emergence in sand seedbed, speed of emergence, speed of emergence-index, speed of emergence-coefficient, accelerated aging, modified cold, tetrazolium (vigour and viability), electrical conductivity, seedling vigour classification, seedling length, seedling dry biomass and germination test under water stress at the osmotic potentials of 0 (control), −0.05, −0.1, −0.2, −0.4 and −0.6 MPa, induced by the use of polyethylene glycol (PEG 6000). The germination test under water stress (−0.2 MPa), evaluated after eight days, pointed out differences on the physiological potential of seeds from different cultivars. The results obtained between the seed vigour tests and germination test under water stress should be analyzed together in order to correlate them accordingly.
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Document Type: Research Article
Publication date: April 1, 2007
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