Plant Organelles—Name the Peroxisome Variant Housing the Glyoxylate Pathway Which specialized peroxisome in certain plants contains the enzymes of the glyoxylate cycle (e.g., isocitrate lyase and malate synthase)?

Introduction / Context:
The glyoxylate pathway enables seedlings—particularly oilseed plants—to convert stored lipids into carbohydrates needed for growth before photosynthesis becomes fully active. This pathway operates in specialized peroxisomes known as glyoxysomes.

Given Data / Assumptions:

• Seed germination phase in plants that rely on triacylglycerol reserves.
• Presence of peroxisome-like organelles enriched in glyoxylate cycle enzymes.
• Coordination with mitochondria and plastids for full carbon conversion to sugars.

Concept / Approach:
Glyoxysomes compartmentalize reactions bypassing CO2-generating steps of the TCA cycle, conserving carbon. Isocitrate lyase and malate synthase are hallmark enzymes, allowing net production of oxaloacetate from acetyl-CoA derived from fatty acid beta-oxidation, which can then be used for gluconeogenesis.

Step-by-Step Solution:

Verification / Alternative check:
Enzyme localization studies show isocitrate lyase and malate synthase concentrated in glyoxysomes of germinating seeds.

Why Other Options Are Wrong:

• “Gly-peroxisome” is not a standard term; lysosome is degradative and animal-specific; spherosomes store lipids but are not the site of the glyoxylate cycle.

Common Pitfalls:
Confusing peroxisomes (various roles) with glyoxysomes (specific to glyoxylate cycle in certain tissues).

Final Answer:
Glyoxysome