Changes in structure of triglycerides from maturing kernels of corn

Area of Science:

• Plant Biochemistry
• Lipid Metabolism
• Agricultural Science

Background:

• Understanding lipid accumulation in developing corn kernels is crucial for crop improvement and nutritional value.
• Triglycerides are the primary storage lipids in many seeds, including corn.

Purpose of the Study:

• To investigate the dynamic changes in triglyceride content and fatty acid composition during corn kernel development.
• To analyze the stereospecific distribution of fatty acids within triglycerides.

Main Methods:

• Corn kernels (inbred H51) were collected at five developmental stages post-pollination.
• Total lipids were extracted and analyzed for triglyceride content.
• Fatty acid composition was determined using gas chromatography, and stereospecific analysis was performed.

Main Results:

• Triglyceride content increased substantially from 8.6% at 10 days to 78.3% at 60 days post-pollination.
• The most active period for triglyceride synthesis was between 20 and 45 days.
• Fatty acid composition showed dynamic changes, with oleic acid increasing and palmitic, linoleic, and linolenic acids decreasing, particularly between 20-60 days, with notable shifts in fatty acid positions on the triglyceride molecule.

Conclusions:

• Corn kernel maturation involves significant changes in triglyceride accumulation and fatty acid profiles.
• Specific fatty acids exhibit distinct positional preferences on the triglyceride backbone during development.
• Understanding these molecular changes can inform breeding strategies for improved corn oil quality.