Variegation

Variegation refers to the appearance of differently coloured zones in the leaves, and sometimes the stems, of plants. Variegation occurs for many different reasons. Most commonly, it is due to the presence of multiple types of plant tissue, but it can also be a sign of disease or damage.

Causes of Variegation

Variegation can be caused by a number of factors. These include:

• Chimeral Variegation: This is the most common type of variegation. It occurs when the cells of the plant contain two different types of chloroplasts. One type produces green tissue, while the other produces white or yellow tissue.

• Viral Variegation: Some viruses can cause variegation in plants. The mosaic virus, for example, causes a mottled green and yellow pattern on the leaves of infected plants.

• Reflective Variegation: This type of variegation is caused by air spaces within the leaf that reflect light. This causes the leaf to appear silvery or white.

Types of Variegation

There are several different types of variegation, including:

• Sectoral Variegation: This is when one part of the leaf is a different colour to the rest. The boundary between the two colours is usually sharp.

• Mosaic Variegation: This is when the different colours are mixed in a mosaic pattern.

• Marbled Variegation: This is when the different colours are mixed in a marbled pattern.

Variegation in Horticulture

Variegation is highly valued in horticulture and many variegated plants are sought after for their decorative appeal. However, variegated plants often require more care than their green counterparts, as they are generally less vigorous and more susceptible to pests and diseases.

See Also

• Chlorophyll
• Photosynthesis
• Plant Physiology

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