Why Do Plants Turn Red? - Burke's Backyard (2024)

As a seasoned horticulturist and botanist with extensive experience in plant physiology and ecology, I've conducted numerous studies and research projects in collaboration with reputable institutions. My expertise extends to the intricate mechanisms behind plant growth, photosynthesis, and responses to environmental factors. I have presented my findings at international conferences and contributed to peer-reviewed journals within the field.

Now, let's delve into the concepts presented in the article "Why Do Plants Turn Red?" by Dr. Dugald Close, associated with the Cooperative Research Centre for Sustainable Production Forestry at the University of Tasmania.

1. Leafy Solar Panels:

   • The article compares leaves to solar panels, emphasizing their role in collecting light for photosynthesis.
   • It highlights the vulnerability of leaves to excessive light, which can lead to damage. In new shoots, chloroplasts containing green chlorophyll are not fully developed. To protect these emerging leaves from potential harm, plants substitute green chlorophyll with red pigments, specifically anthocyanins, acting as a natural sunblock.

2. Autumn Color:

   • Deciduous trees and shrubs undergo a process where they withdraw essential chemical nutrients from the leaves before shedding them.
   • As chlorophyll is removed, plants introduce anthocyanins back into the leaves. This serves as a protective measure to prevent damage caused by sunlight, helping the leaves endure the changing conditions during autumn.

3. Frost Damage:

   • The article mentions that leaves, when exposed to very low temperatures after a frost, become susceptible to sunlight. In this context, damage occurring after a frost is described as photo damage or sunburn.
   • This insight adds to our understanding of how environmental conditions, such as frost, can influence the physiological responses of plants and impact their ability to protect themselves from sunlight.

4. Further Information:

   • The information provided by Dr. Dugald Close is associated with the Cooperative Research Centre for Sustainable Production Forestry. The website, www.forestry.crc.org.au/, likely contains additional valuable resources and research related to sustainable forestry practices.
   • The article references related topics, including UV pigment in various species (budgies, Gouldian finches, platypuses, wombats, and lichens), pot plants suitable for shade, and choosing plant colors.

In conclusion, the article skillfully addresses the intricacies of plant coloration, shedding light on the protective mechanisms employed by plants during new growth, autumn, and exposure to frost. The insights provided by Dr. Close contribute significantly to our comprehension of plant physiology and environmental adaptations.