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Mycoheterotrophy Evolved from Mixotrophic Ancestors: Evidence in Cymbidium (Orchidaceae)

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Mycoheterotrophy Evolved from Mixotrophic Ancestors: Evidence in Cymbidium (Orchidaceae) Annals of Botany 106: 573–581, 2010 doi:10.1093/aob/mcq156, available online at www.aob.oxfordjournals.org Mycoheterotrophy evolved from mixotrophic ancestors: evidence in Cymbidium (Orchidaceae) Hiroyuki Motomura1, Marc-Andre´ Selosse2, Florent Martos2,3, Akira Kagawa4 and Tomohisa Yukawa1,* 1Tsukuba Botanical Garden, National Museum of Nature and Science, Tsukuba, Ibaraki 305-0005, Japan, 2Centre d’Ecologie Fonctionnelle et Evolutive (CNRS, UMR 5175), Equipe Interactions Biotiques, 19129 Route de Mende, Montpellier cedex 5, France, 3UMR C53 Peuplements Ve´ge´taux et Bioagresseurs en Milieu Tropical, Universite´ de La Re´union, 15 Avenue Rene´ Cassin, BP 7151, 97715 Saint-Denis cedex 9, France and 4Forestry and Forest Products Research Institute, Tsukuba Norin PO Box 16, Ibaraki 305-8687, Japan * For correspondence. E-mail [email protected] Received: 15 December 2009 Returned for revision: 9 April 2010 Accepted: 25 June 2010 Published electronically: 4 August 2010 Downloaded from † Background and Aims Nutritional changes associated with the evolution of achlorophyllous, mycoheterotrophic plants have not previously been inferred with robust phylogenetic hypotheses. Variations in heterotrophy in accordance with the evolution of leaflessness were examined using a chlorophyllous–achlorophyllous species pair in Cymbidium (Orchidaceae), within a well studied phylogenetic background. † Methods To estimate the level of mycoheterotrophy in chlorophyllous and achlorophyllous Cymbidium, 13 15 natural Cand N contents (a proxy for the level of heterotrophy) were measured in four Cymbidium aob.oxfordjournals.org species and co-existing autotrophic and mycoheterotrophic plants and ectomycorrhizal fungi from two Japanese sites. † Key Results d13C and d15N values of the achlorophyllous C. macrorhizon and C. aberrans indicated that they are full mycoheterotrophs. d13C and d15N values of the chlorophyllous C. lancifolium and C. goeringii were inter- mediate between those of reference autotrophic and mycoheterotrophic plants; thus, they probably gain 30–50 % of their carbon resources from fungi. These data suggest that some chlorophyllous Cymbidium exhibit partial mycoheterotrophy (¼ mixotrophy). † Conclusions It is demonstrated for the first time that mycoheterotrophy evolved after the establishment of mix- at INIST-CNRS on October 1, 2010 otrophy rather than through direct shifts from autotrophy to mycoheterotrophy. This may be one of the principal patterns in the evolution of mycoheterotrophy. The results also suggest that the establishment of symbiosis with ectomycorrhizal fungi in the lineage leading to mixotrophic Cymbidium served as pre-adaptation to the evolution of the mycoheterotrophic species. Similar processes of nutritional innovations probably occurred in several independent orchid groups, allowing niche expansion and radiation in Orchidaceae, probably the largest plant family. Key words: Mycoheterotrophy, nutritional mode, evolution, Cymbidium, Orchidaceae, symbiosis, mycorrhizal fungi, d15N, d13C. INTRODUCTION called mixotrophy (MX), has been suggested to be a pre- adaptation in the evolution of MH nutrition (Bidartondo Unlike the autotrophic nutritional mode of chlorophyllous and et al., 2004; Selosse et al., 2004, 2006; Abadie et al., 2006). leafy plants, which use atmospheric CO2 as their sole carbon In orchids, both MX and MH species tend to associate with source, some achlorophyllous and leafless plant species unusual mycorrhizal fungi: instead of the usual saprobic or obtain carbon from mycorrhizal fungi (Bjo¨rkman, 1960; parasitic Rhizoctonia fungi that are the almost exclusive McKendrick et al., 2000; Smith and Read, 2008). This fully associates of autotrophic orchids (Rasmussen, 1995), most heterotrophic nutrition, so-called mycoheterotrophy (MH), MX and MH orchids recruit various ascomycetes and basidio- occurs in .400 species belonging to 87 genera in 11 families mycetes, which are ectomycorrhizal fungi on surrounding tree (Leake, 1994, 2005). roots (Taylor et al., 2002). MX and MH species thus indirectly MH nutrition has evolved repeatedly from autotrophy (AT) exploit tree photosynthates as a carbon source (McKendrick in various plant lineages, but detailed evolutionary processes et al., 2000). that lead to MH remain unclear. Recent studies demonstrated Nutritional changes associated with the evolution of achlor- that several chlorophyllous species in Orchidaceae and ophyllous plant species have to date been inferred from Ericaceae obtain carbon not only from their photosynthetic assumptions without using clades in which leaflessness activity, but also from mycorrhizal fungi (Gebauer and appears (Bidartondo et al., 2004; Tedersoo et al., 2007; Roy Meyer, 2003; Bidartondo et al., 2004; Selosse et al., 2004; et al., 2009) or from comparisons between green plants and Julou et al., 2005; Cameron et al., 2006; Tedersoo et al., albino mutants that exist in some species (Julou et al., 2005; 2007; Zimmer et al., 2007, 2008). This nutritional mode, Abadie et al., 2006). For these reasons, it is necessary to # The Author 2010. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. For Permissions, please email: [email protected] 574 Motomura et al. — Diversification of mycoheterotrophy in orchids clarify fluctuations of heterotrophy in accordance with the saprobic (Tulasnellaceae) and tree ectomycorrhizal evolution of leaflessness using a relationship between chloro- (Sebacinales, Russulaceae, Thelephoraceae, etc.) fungi, phyllous and achlorophyllous species based on credible phylo- whereas achlorophyllous C. macrorhizon and C. aberrans genetic hypotheses. establish symbiosis exclusively with ectomycorrhizal fungi. Cymbidium, an orchid genus distributed from east and Furthermore, Motomura et al. (2008) demonstrated a large south-east Asia to Australia, comprises about 52 species diversification of photosynthetic modes in Cymbidium. (DuPuy and Cribb, 2007). This genus exhibits distinctive eco- Therefore, Cymbidium is an ideal model taxon to test contri- logical diversification (Motomura et al., 2008) and occurs in butions of carbon from mycorrhizal fungi, in accordance terrestrial, epiphytic and lithophytic life forms. Two species, with the evolution of leaflessness and associated characters C. macrorhizon and C. aberrans, lack foliage leaves and are related to nutritional innovations. thus assumed to be MH (Fig. 1). MH plants are highly enriched in 13C and 15N relative to AT Yukawa et al. (2002) analysed phylogenetic relationships plants (Gebauer and Meyer, 2003; Trudell et al., 2003). Their among 36 Cymbidium spp. using nucleotide variation in the 13C contents are similar to, or slightly more elevated than, nuclear and plastid genomes and found that these achlorophyl- those of associated mycorrhizal fungi, whereas their 15N con- lous species are sister species, in a clade successively connect- tents tend to be higher (Trudell et al., 2003; Selosse and Roy, ing with Cymbidium lancifolium and the clade including 2009). Fractionation against heavy isotopes occurs commonly Cymbidium goeringii (Fig. 2). Cymbidium lancifolium and in physical and metabolic processes, and thus analysis of the Downloaded from C. goeringii develop foliage leaves and appear to be capable natural abundance of stable isotopes allows tracking of nutrient of AT nutrition. On the other hand, the evolution of characters sources and fluxes in ecosystems (Dawson et al., 2002; Post, related to nutritional traits has been well analysed in 2002). Isotopic abundance in MH plants correlates with the Cymbidium: in an investigation of the vegetative anatomy of use of resources derived from their mycorrhizal fungi (and the genus, Yukawa and Stern (2002) found degeneration of ultimately from nearby AT plants). As expected, 13C and 15 aob.oxfordjournals.org stomata in C. macrorhizon, indicating a lack of CO2 exchange N abundances in MX orchid species range between those in this species. Yokoyama et al. (2002) and Y. Ogura-Tsujita of AT and MH species (Gebauer and Meyer, 2003; and T. Yukawa (unpubl. res.) found a shift of mycobionts Bidartondo et al., 2004; Julou et al., 2005; Roy et al. 2009), between chlorophyllous and achlorophyllous Cymbidium. and are indicative of variable levels of heterotrophy from Chlorophyllous C. lancifolium and C. goeringii both harbour one species or one site to another. A B at INIST-CNRS on October 1, 2010 F IG.1. Cymbidium lancifolium, a leafy and chlorophyllous species (A), and C. macrorhizon, a leafless and achlorophyllous species (B). Cymbidium lancifolium is the closest relative of the achlorophyllous Cymbidium species (see Fig. 2). Reproduced from Maekawa (1971), del. Yoai Ohta. Motomura et al. — Diversification of mycoheterotrophy in orchids 575 Taxon Foliage leaf Mycobiont Saprophytic Ectomycorrhizal C. macrorhizon ––+ 100 100 C. aberrans ––+ 100 Loss of foliage leaves 100 Loss of saprophytic mycobionts 84 86 C. lancifolium +++ C. goeringii +++ (representative of Gain of ectomycorrhizal mycobionts sects. Jensoa & Maxillarianthe) other Cymbidium ++– Downloaded from F IG. 2. Reconstruction of character evolution related to nutritional properties in Cymbidium. The phylogram of Cymbidium is summarized from the results of molecular phylogenetic analyses by Yukawa et al. (2002). Numbers above and below internodes indicate bootstrap values from 1000 replicates of Fitch parsi- mony analysis and neighbor-joining analysis, respectively. In this study, spontaneous stable isotopic contents
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