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Title: Evaluation of some important aspects of seed vigour and viability in soybean (Glycine max L. Merrill)
Author: Ehsanullah
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 1994
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This study is in three sections, the first section investigated the environmental and seed quality factors affecting seed vigour and viability in soybean. In addition an experiment was performed which attempted to correlate laboratory viability tests to field emergence. The second section investigated the effect of the rate of water uptake on germinability using polyethylene glycol (PEG). Finally section three evaluated different soybean cultivars for storage potential and resistance to soaking in distilled water. Laboratory germination at 250C or 30oC, seedling fresh weight, conductivity and tetrazolium chloride topographic staining tests were highly correlated with field emergence at North West Frontier Province Agricultural University Research Station, Mingora, Pakistan. However, seeds aged for longer periods progressively lost the ability to germinate under field conditions. Sealed storage at 8% seed moisture content was superior to storage at 12% or 16% seed moisture content. Compared to seeds with 12% or 16% initial seed moisture content those at 6% initial moisture content showed reduced germinability due to high solute leakage. Solute leakage increased as soaking temperature increased, but at a higher rate when initial seed moisture content was low (6%). Compared to larger-seeded cultivars, smaller seeded cultivars were susceptible to etching, but showed better storage potential. Ageing, or soaking for 5 or 10 h in distilled water produced fewer normal seedlings and delayed 50% emergence by 1.5 days due to high solute leakage. The seeds germinated earlier and produced more nomal seedlings when soaking occurred in PEG compared to distilled water. Seeds with lower vigour due to ageing, produced a higher number of normal seedlings, greater shoot length, shoot fresh weight and shoot dry weight when pre-imbibed in 25% PEG compared to distilled water.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available