They are relatively rare in nature, compared to the two other major groups of plant pigments, and until recently, their synthesis in plants was poorly understood. (sciencedaily.com)
Two major groups of plants have shown a surprising reversal of fortunes in the face of rising levels of carbon dioxide in the atmosphere. (sciencenews.org)
The hypothesis made sense because many insects are restricted to feeding on certain groups of plants, and many plants have defenses targeting insects. (sciencemag.org)