In an interview with botanist Douglas Soltis, it has been revealed that a recent study has confirmed Charles Darwin’s suspicions from over a century ago about a seemingly harmless flowering plant being a carnivorous predator. The plant in question, Saxifraga candelabrum, found in the rocky mountain crevices of southwestern China, has been identified as using its sticky hairs to trap and consume insects.
Published in the journal Nature Communications, the study comes 151 years after Darwin’s initial observations of insects stuck to leaves and stems of Saxifraga plants. The plant species, including the researched one, are characterized by millimeter-long hairs exuding a sweet, sticky substance that attracts insects. This mechanism fascinated Darwin, leading him to speculate about the predatory nature of Saxifraga plants in 1875.
To validate the carnivorous behavior of Saxifraga candelabrum, researchers conducted experiments using fruit flies enriched with nitrogen, a vital nutrient for the nutrient-deficient mountain plants. The plants, seeking nitrogen, developed sticky hairs initially to protect their seeds from insects, eventually evolving to extract nutrients from trapped insects through enzyme secretion.
Soltis explained that carnivorous plants, such as Saxifraga candelabrum, strategically trap smaller insects while ensuring pollinators remain unaffected by the sticky hairs. This study suggests the potential existence of more undiscovered carnivorous plants, possibly within Darwin’s favored Saxifraga genus.
Overall, the remarkable adaptations of carnivorous plants, including various trapping mechanisms like Venus flytraps and pitcher plants, exhibit nature’s ingenuity in capturing prey for essential nutrients. The diverse range of carnivorous plants worldwide underscores the fascinating evolution of plant predation, a subject that intrigued Darwin and continues to inspire botanical research.