Biochemical, physiological and ecological studies during embryogenesis, germination and storage of seeds of two contrasting rainforest species - Erythrina caffra and Guilfoylia monostylis

Nkang, Ani Essien (1986). Biochemical, physiological and ecological studies during embryogenesis, germination and storage of seeds of two contrasting rainforest species - Erythrina caffra and Guilfoylia monostylis PhD Thesis, School of Biological Sciences, University of Queensland.

       
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Author Nkang, Ani Essien
Thesis Title Biochemical, physiological and ecological studies during embryogenesis, germination and storage of seeds of two contrasting rainforest species - Erythrina caffra and Guilfoylia monostylis
School, Centre or Institute School of Biological Sciences
Institution University of Queensland
Publication date 1986
Thesis type PhD Thesis
Supervisor Graeme Chandler
Total pages 252
Language eng
Subjects 06 Biological Sciences
Formatted abstract
Investigations of this dissertation have focussed attention on events during seed development and germination and loss of viability in storage, using as models two contrasting rainforest species - Erythrina caffra (with orthodox viability charactristics) and Guilfoylia monostylis (with recalcitrant viability characteristics). Activities of some enzymes thought to be associated with initiation of germination and/or dormancy breaking, as well as the effects of some chemicals known to stimulate germination have been investigated from embryogenesis up to and including loss of viability in storage. 

There were differences in activities of certain enzyme complements of Guilfoylia and Erythrina during seed maturation. Succinate dehydrogenase activity (fresh weight basis) was more or less constant in Guilfoylia but declined substantially in Erythrina during maturation. Activities of peroxidase (fresh weight basis) remained high and more or less constant in Guilfoylia but declined substantially in Erythrina during maturation. Further, specific activities of peroxidases were much higher in Guilfoylia than in Erythrina. Activity of the pentose phosphate pathway was predominant over that of the glycolytic pathway during maturation in Guilfoylia, in contrast to the situation in Erythrina where glycolysis predominated. These differences may be indicative of differential germination strategies. Activities of most cytoplasmic enzymes increased or decreased before levelling out on attainment of physiological maturity. Levels established at physiological maturity closely approached initial levels during germination and, for some enzymes at least (e.g. enzymes of the pentose phosphate pathway, peroxidase and catalase), the ability to maintain or increase these initial levels appeared obligatory for germination. Results suggested that a multiplicity of enzymes of different pathways may be linked in a co-operative manner to mediate events associated with initiation of germination. .................................
Keyword Seeds -- Development
Seeds -- Storage
Seeds -- Viability
Germination
Trees -- Tropics -- Seeds
Additional Notes Spine title : Biochemical, physiological and ecological studies on some rainforest trees

Document type: Thesis
Collection: UQ Theses (RHD) - UQ staff and students only
 
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