What Are Plastids and Their Function?

Plastids are specialized double-membrane organelles found in plant cells and algae that perform photosynthesis, store nutrients, and produce essential cellular compounds.

Plastids serve as the powerhouses of plant metabolism, handling multiple critical functions:

Primary Functions:

• Photosynthesis: Chloroplasts convert light energy into chemical energy (glucose)
• Storage: Amyloplasts store starch, elaioplasts store oils and lipids
• Pigmentation: Chromoplasts produce and store colorful pigments in flowers and fruits
• Synthesis: Create fatty acids, amino acids, and other essential molecules

Important Notes::

• Plastids are exclusive to plant cells and algae
• They contain their own DNA and ribosomes
• Different plastid types perform specialized roles
• All plastids evolve from proplastids in young cells