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Until recently, scientists thought that A. elatior has the most unusual pollination ecology among all flowering plants, being pollinated by slugs and amphipods. However, direct observation of their ecosystem has revealed that they are mainly pollinated by fungus gnats, probably thanks to their resemblance to mushrooms.This discovery was made by Project Associate Professor SUETSUGU Kenji (Kobe University Graduate School of Science) and Senior Researcher SUEYOSHI Masahiro (Forest Zoology Group, Kyushu Research Center). The findings were published on November 14 in the online edition of Ecology.Figure 2: Aspidistra elatior flower blooming half-buried in the earthAspidistra elatior is a popular houseplant, known as the “cast iron plant” for its ability to withstand neglect. It can be found growing all over the world, but is indigenous to southern Japanese islands. Its purple, fleshy flowers bloom directly above the soil, almost burrowing into the ground and often hidden by leaf litter. Their appearance has been compared to mushrooms – one of the foods of choice for the fungus gnats that visit these flowers. The oddly-shaped flowers of A. elatior are probably a clever strategy: mimicking mushrooms in order to trick fungus gnats into pollinating them.Flying insects such as honeybees and bumblebees are essential pollinators for many plants. However, some plants use other animals for pollination. For example, some banana species use bats, and a species called banksia uses opossums. Reports of slug pollination for A. elatior date from over 100 years ago, when slugs were observed visiting plants in Europe. This theory is still widely accepted and even appears in textbooks. However, the observation has a flaw – it was not made in the plant’s natural habitat. Furthermore, visiting a plant does not mean the animal acts as a pollinator. On the contrary, slugs are known for eating leaves and flowers, and they may have been damaging the plants.In 2009 there were reports of fungus gnats visiting the A. elatior flowers. But this observation was also made outside the plant’s native habitat, and it was only a single report – not enough for conclusive proof of pollination by fungus gnats.Figure 3: A species of fungus gnat that visits A. elatior. Large amounts of A. elatior pollen grains are attached to its bodyThis time the research team took a different approach. “For two years we observed the animals that visited these flowers in their native habitat, continuously, day and night.” The result? “We discovered that no slugs visited, and hardly any beach fleas. The candidate that emerged as an effective pollinator was the fungus gnat. Fungus gnats that visited the plants quickly dived into the center of the flowers, attached a large amount of pollen to their bodies, and flew away.” The team also saw fungus gnats arriving at A. elatior flowers carrying pollen from other flowers, and observed that the flowers they visited produced fruit. This proved that fungus gnats were the true pollinators.Professor Suetsugu comments: “We believe that the similar appearance of A. elatior and mushroom fruit bodies may help attract fungus gnats. In addition, A. elatior emits a strong musty odor. Therefore, the fungus gnats may be deceived by both visual and chemical mimicry.”These findings have overturned a widely accepted theory, and clarified that like most plants, A. elatior are pollinated mainly by flying insects. In other words, this plant, although mysterious, may not be so strange after all.Journal informationTitle“Subterranean flowers of Aspidistra elatior are mainly pollinated by not terrestrial amphipods but fungus gnats”DOI10.1002/ecy.2021AuthorsKenji Suetsugu and Masahiro SueyoshiJournalEcologyResearchersSuetsugu KenjiProfessorGraduate School of ScienceSDGs)">Graduate School of ScienceSHAREMore from these researchersPress releases2024.05.09Biological sciencesNew record holder for smallest dispersers of ingested seeds: WoodlicePress releases2024.03.01Biological sciencesA new plant’s name that tells a storyPress releases2024.02.20Biological sciencesPollinator's death trap turns into nurseryPress releases2023.10.18Biological sciencesOrchid without bumblebee on island finds wasp, loses selfMore about these topicsPress releases2023.08.24Biological sciencesFungi-eating plants and flies team up for reproductionPress releases2018.03.23Biological sciencesFreeloading orchid relies on mushrooms above and below groundPress releases2023.01.24Biological sciencesNew discovery: Endangered Amami rabbit disperses seeds for non-photosynthetic plantPress releases2022.07.29Biological sciencesOrchid helps insect get a gripページの先頭へ1-1, Rokkodai-cho, Nada-ku, Kobe, 657-8501, JAPANProspective studentsCurrent studentsAlumsCorporate and societyFaculty and staffContactAccessJobsOfficial social media accountsCampus calendarPrivacy policySite policySite map© Kobe University