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Storage protein changes during zygotic embryogenesis in interior spruce.
B S Flinn1, D R Roberts, D T Webb
1Forest Biotechnology Centre, British Columbia Research Corporation, 3650 Wesbrook Mall, Vancouver, B.C., Canada V6S 2L2.
Tree Physiology
|January 1, 1991
Summary
Interior spruce (Picea glauca/Picea engelmanii) storage proteins include albumins and globulins, with distinct accumulation patterns during seed development. These proteins are crucial for embryo development and maturation.
Area of Science:
- Plant molecular biology
- Conifer seed development
- Protein biochemistry
Background:
- Protein bodies in plant seeds store essential nutrients for embryo development.
- Understanding storage proteins in conifers is vital for forest genetics and breeding programs.
Purpose of the Study:
- To characterize the major storage proteins in interior spruce (Picea glauca/Picea engelmanii) embryos.
- To investigate the developmental regulation of storage protein accumulation during embryogenesis.
Main Methods:
- Isolation and molecular weight determination of storage proteins using SDS-PAGE.
- Solubility characterization to differentiate protein classes (albumin, globulin).
- Two-dimensional electrophoresis to analyze protein heterogeneity (isoelectric variants).
Main Results:
- Identified major storage proteins with apparent molecular weights of 41, 35, 33, 24, and 22 kD.
- Classified the 41 kD protein as a water-soluble albumin and the others as buffer-insoluble, salt-soluble globulins.
- Observed developmentally specific accumulation, with the 41 kD albumin accumulating late and globulins accumulating early in embryogenesis, both peaking during cotyledon maturation.
Conclusions:
- Interior spruce embryos accumulate distinct albumin and globulin storage proteins.
- Storage protein synthesis is tightly regulated during embryogenesis, with specific temporal patterns for different protein classes.
- These findings contribute to understanding seed physiology and storage protein function in conifers.