Storage-protein hydrolysis and protein-body breakdown in germinatedZea mays L. seeds

Area of Science:

• Plant biochemistry
• Maize (Zea mays L.) seed physiology

Background:

• Endosperm storage proteins are crucial for maize seed development and germination.
• Protein bodies are the primary storage sites for these proteins within the endosperm.

Purpose of the Study:

• To investigate the degradation patterns of major maize storage proteins during seed germination.
• To understand the structural changes and hydrolysis sequence within protein bodies.

Main Methods:

• Analysis of storage proteins in germinated maize seeds.
• Isolation and study of protein bodies from endosperms at various germination stages.
• Immunocytochemical labeling using specific antisera (anti-glutelin 2, anti-zein 1).

Main Results:

• Major endosperm storage proteins, glutelin 2 and zein 1, undergo sequential hydrolysis.
• Glutelin 2 is degraded more rapidly than zein 1.
• Protein bodies are degraded via progressive surface hydrolysis.
• Digestion of glutelin 2 correlates with the disappearance of protein-body membranes.

Conclusions:

• The degradation of maize storage proteins during germination is a sequential process.
• Protein body structure, including membranes, is involved in the controlled release of nutrients.
• Understanding this hydrolysis pathway is key to maize seed physiology and nutrient mobilization.