Photosynthesis in orchid roots?

[Ross]

Originally Posted by Jadeco

I have recently taken botany, and our textbook (Introductory Plant Biology by Kingsley R Stern, James Bidlack, and Shelley Jansky) pointed out that, initially, the primary function of phalaenopsis orchid roots was believed to hold water since their roots are so thick, but recent research has shown that they heavily involve photosynthesis. I wish I still had the textbook to cite any sources and give exact quotes.

Welcome Jadeco. Ray is correct. The green in the roots comes from chlorophyl (rarely from algae .) It's also a handy way to tell when roots are pretty wet. When wet they are normally green. Why dry, they are normally white.