In a recent interview with botanist Douglas Soltis, the revelation of a long-held suspicion by Charles Darwin has finally been confirmed after over a century. A seemingly harmless flowering plant, Saxifraga candelabrum, found in the rocky mountain crevices of southwestern China, has been unveiled as a carnivorous species that ensnares and consumes unsuspecting insects using its adhesive hairs.
The groundbreaking study, disclosed in the journal Nature Communications on Tuesday, marks 151 years since Darwin initially proposed the existence of predatory traits within the Saxifraga genus. These plants, including the one under scrutiny in this research, are adorned with tiny hairs exuding a sweet, sticky substance that attracts insects, leading to their entrapment on the plant’s surfaces.
Darwin’s fascination with insects stuck to Saxifraga plant parts in 1875 sparked the initial speculation of carnivorous behavior, a hypothesis that lacked definitive proof at the time. However, modern advancements allowed Soltis and his team to demonstrate the plant’s ability to digest trapped insects, absorb their nutrients, and disperse these elements throughout its structure.
The study involved utilizing fruit flies fed with nitrogen-enriched food to ascertain if Saxifraga candelabrum indeed consumed insects for nitrogen, a vital nutrient in nutrient-deficient mountainous terrains. The evolutionary journey of these carnivorous plants may have begun with the development of sticky hairs to safeguard seeds from insect consumption, eventually leading to the utilization of captured insects for nourishment.
While balancing the need for nutrients and pollination, Saxifraga candelabrum cleverly targets smaller insects for consumption without hindering larger pollinators. This study hints at the presence of more undiscovered carnivorous plants within the Saxifraga genus, affirming previous predictions made by researchers who identified similar carnivorous traits in a plant at B.C.’s Cypress Provincial Park.
The intriguing world of carnivorous plants, with over 630 known species worldwide, showcases diverse mechanisms such as Venus flytraps’ snap-closure leaves and pitcher plants’ enticing nectar that drowns prey in digestive fluids. The affinity for flesh among these plants extends beyond insects, with instances of pitcher plants in Ontario preying on salamanders, exemplifying the remarkable adaptations plants have evolved to procure essential nutrients.
