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A New Carnivorous Plant Lineage (Triantha) with a Unique Sticky-Inflorescence Trap

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A New Carnivorous Plant Lineage (Triantha) with a Unique Sticky-Inflorescence Trap A new carnivorous plant lineage (Triantha) with a unique sticky-inflorescence trap Qianshi Lina,b,1, Cécile Anéc,d, Thomas J. Givnishc, and Sean W. Grahama,b aDepartment of Botany, University of British Columbia, Vancouver, BC V6T 1Z4, Canada; bUBC Botanical Garden, University of British Columbia, Vancouver, BC V6T 1Z4, Canada; cDepartment of Botany, University of Wisconsin–Madison, Madison, WI 53706; and dDepartment of Statistics, University of Wisconsin–Madison, Madison WI 53706 Edited by Elizabeth A. Kellogg, Donald Danforth Plant Science Center, St. Louis, MO, and approved June 5, 2021 (received for review October 30, 2020) Carnivorous plants consume animals for mineral nutrients that and in wetlands, including bogs, marly shorelines, and calcareous enhance growth and reproduction in nutrient-poor environments. spring-fed fens. In bogs, T. occidentalis is commonly found with Here, we report that Triantha occidentalis (Tofieldiaceae) represents recognized carnivorous plants such as Drosera rotundifolia a previously overlooked carnivorous lineage that captures insects on (Droseraceae) and Pinguicula vulgaris (Lentibulariaceae). During sticky inflorescences. Field experiments, isotopic data, and mixing the summer flowering season, T. occidentalis produces leafless models demonstrate significant N transfer from prey to Triantha, erect flowering stems up to 80 cm tall (12). These scapes have with an estimated 64% of leaf N obtained from prey capture in sticky glandular hairs, especially on their upper portions, a feature previous years, comparable to levels inferred for the cooccurring distinguishing Triantha from other genera of Tofieldiaceae round-leaved sundew, a recognized carnivore. N obtained via carnivory (Fig. 1). Small insects are often found trapped by these hairs; is exported from the inflorescence and developing fruits and may herbarium specimens are frequently covered in insects (Fig. 1D). ’ ultimately be transferred to next year s leaves. Glandular hairs on Their glandular hairs bear shiny secretions and have a conspicuous flowering stems secrete phosphatase, as seen in all carnivorous plants reddish color (Fig. 1C), similar to those found in sundews and Triantha that directly digest prey. is unique among carnivorous plants other sticky-trap carnivorous plants where they may play a role in in capturing prey solely with sticky traps adjacent to its flowers, con- luring prey (1, 3). trary to theory. However, its glandular hairs capture only small in- In a study of plastid phylogenomics and molecular evolution of sects, unlike the large bees and butterflies that act as pollinators, Alismatales, Ross et al. (13) found a novel loss in Triantha of ECOLOGY which may minimize the conflict between carnivory and pollination. genes involved in the plastid NADH dehydrogenase-like (NDH-1) complex, a ferredoxin-plastoquinone reductase thought to regulate enzymatic digestion | holocarnivory | isotopic analysis | monocotyledons | photosynthetic electron flow, mitigate effects of PS I inhibition, and predation/pollination conflict fine-tune photosynthesis in dynamic light conditions (14–16). Ross et al. (13) conjectured that Triantha might be cryptically carnivorous, arnivorous plants, which overturn the usual trophic relation- in part because ndh gene loss has also been found in some car- Cship between plants and animals, have long fascinated humans nivorous Lentibulariaceae (17) [this loss is otherwise uncommon (1) and have been the subject of wide-ranging scientific research outside heterotrophic plants (13)]. While a possible association since the seminal monograph by Charles Darwin (2). Carnivorous between carnivory and loss of ndh genes is speculative, the ob- plants fix carbon from photosynthesis but absorb mineral nutri- servation by Ross et al. (13) aroused our curiosity and helped ents, especially N and P, from animal prey, helping them to survive motivate this study, along with the shared habitat of T. occidentalis and compete successfully in low-nutrient environments (3, 4). Eleven independent origins of carnivory are currently recognized, Significance including ∼800 species in six orders, 13 families, and 20 genera of flowering plants, with eight origins in the eudicots and three in the ’ monocot order Poales (5, 6). Members of other eudicot lineages Since Darwin s ground-breaking monograph on carnivorous have been suggested previously as being carnivorous, but these plants, scientists have recognized only 11 independent origins proposals lacked adequate experimental support for nutrient of plant carnivory. We report the discovery of a new lineage of uptake or resulting increases in plant growth, competitive ability, carnivorous plants, represented by the North American flow- ering plant Triantha occidentalis. Among monocots, Triantha and/or reproduction (1, 4, 7). The high energetic costs of structures represents the only instance of a sticky-trap mechanism and a and enzymes related to carnivory may limit carnivorous plants clearly documented case of holocarnivory, marked by enzymatic primarily to sunny, moist, nutrient-poor habitats where they can secretion consistent with prey digestion. Its trap is unique obtain an advantage in growth, survival, or reproduction (3, 4, 8), ∼ among carnivorous plants and, unexpected based on theory, in which may explain why carnivory occurs in only 0.2% of angiosperm placing all of its prey-capture sites next to its insect-pollinated species (5). flowers. Given the existence of Triantha in close proximity to Over the past 2 decades, only one novel example of holocarnivory — — major urban centers on the Pacific coast, our study serves as a (9) in which plants produce enzymes to digest prey has been vivid reminder that other cryptic carnivores may yet remain to documented (Philcoxia, Plantaginaceae) (10). Carnivory is unknown be discovered. in monocots outside order Poales (5). All three carnivorous lineages in Poales use leaf rosettes to accumulate water and drown in- Author contributions: Q.L. and S.W.G. designed research; Q.L. performed research; C.A. sects in pitfall traps and (except possibly in Brocchinia reducta, contributed new reagents/analytic tools; Q.L., C.A., T.J.G., and S.W.G. analyzed data; and Bromeliaceae) accomplish enzymatic degradation of prey pri- Q.L., C.A., T.J.G., and S.W.G. wrote the paper. marily via microbial or insect partners, rather than through their The authors declare no competing interest. own digestive enzymes (11). This article is a PNAS Direct Submission. Triantha occidentalis (in the monocot family Tofieldiaceae, Published under the PNAS license. Alismatales; Fig. 1A) is a rhizomatous perennial herb found along 1To whom correspondence may be addressed. Email: [email protected]. the west coast of North America, from CA to AK (12). The four This article contains supporting information online at https://www.pnas.org/lookup/suppl/ species of Triantha are native to North America and Japan. They doi:10.1073/pnas.2022724118/-/DCSupplemental. occur in open nutrient-poor habitats, especially along streambanks Published August 9, 2021. PNAS 2021 Vol. 118 No. 33 e2022724118 https://doi.org/10.1073/pnas.2022724118 | 1of6 Downloaded at The University of British Columbia Library on August 9, 2021 A BC D E Fig. 1. T. occidentalis (Tofieldiaceae) scapes bearing dense glandular hairs, several with trapped insects (arrows), including flies and beetles. (A) Whole flowering plants growing in a bog at Cypress Provincial Park, BC. Image credit: Danilo Lima (Universidade Estadual de Feira de Santana, Feira de Santana, Brazil). (B and C) Fresh field specimens from North Cascades National Park, WA, with a close-up view (C) showing sticky reddish glandular hairs. (D) Herbarium specimen (L. P. Janeway, collection no. 7318, Chico State Herbarium, CHSC) from Trinity, CA, with captured insects (arrows). (E) SEM of upper stem, plant from Cypress Provincial Park, BC. (Scale bar: A, 1 cm; B–E, 1.5 mm.) with, and its similar morphology to, sticky-trap carnivorous plants. leaves of both Drosera and Triantha also have significantly higher We therefore investigated its potential status as a holocarnivorous values of δ15N(P < 0.02; SI Appendix,TableS1andFig.S1) plant, following procedures applied in other studies demonstrating than similar leaves of the noncarnivores (Table 1), which is con- carnivory (10, 18). If Triantha is carnivorous, it likely is so only sistent with increased discrimination for 15Ninmovingupthe during the flowering season, when glandular inflorescences are trophic ladder, taken as a hallmark of N uptake from prey in other present. Catching insects using sticky inflorescence stems is rare; carnivorous plants (8, 23, 24). plants that do this include Silene (1) (Caryophyllaceae) and Stylidium We experimentally applied 15N-labeled Drosophila to leaves of (Stylidiaceae) (7), but these taxa have not been demonstrated to Drosera and upper stems of Erigeron and Triantha in the field involve botanical carnivory. (Materials and Methods). This led to no significant change in stem Here we test the hypothesis that T. occidentalis is carnivorous Ncontentandδ15N in the noncarnivore Erigeron (Fig. 2; see also by doing a field experiment with 15N-labeled insects to demon- Table 1). In Drosera, feeding led to no significant increase in leaf − strate nutrient uptake. Experiments using stable isotopes have N content but a significant (P < 1 × 10 4; SI Appendix, Table S2) frequently been used to investigate plant carnivory (18–20), in and large increase of up to 550‰
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