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Macroevolution of Leaf Defenses and Secondary Metabolites Across the Genus Helianthus

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Macroevolution of Leaf Defenses and Secondary Metabolites Across the Genus Helianthus Research Macroevolution of leaf defenses and secondary metabolites across the genus Helianthus Chase M. Mason1, Alan W. Bowsher1, Breanna L. Crowell1, Rhodesia M. Celoy2, Chung-Jui Tsai2 and Lisa A. Donovan1 1Department of Plant Biology, University of Georgia, Athens, GA 30602, USA; 2Warnell School of Forestry and Natural Resources, and Department of Genetics, University of Georgia, Athens, GA 30602, USA Summary Author for correspondence: Leaf defenses are widely recognized as key adaptations and drivers of plant evolution. Chase M. Mason Across environmentally diverse habitats, the macroevolution of leaf defenses can be predicted Tel: +1 386 916 6578 by the univariate trade-off model, which predicts that defenses are functionally redundant Email: [email protected] and thus trade off, and the resource availability hypothesis, which predicts that defense Received: 10 April 2015 investment is determined by inherent growth rate and that higher defense will evolve in lower Accepted: 6 October 2015 resource environments. Here, we examined the evolution of leaf physical and chemical defenses and secondary New Phytologist (2015) metabolites in relation to environmental characteristics and leaf economic strategy across 28 doi: 10.1111/nph.13749 species of Helianthus (the sunflowers). Using a phylogenetic comparative approach, we found few evolutionary trade-offs among Key words: chemical, herbivory, high- defenses and no evidence for defense syndromes. We also found that leaf defenses are performance liquid chromatography–mass strongly related to leaf economic strategy, with higher defense in more resource-conservative spectrometry (HPLC-MS), pathogen, species, although there is little support for the evolution of higher defense in low-resource physical, sunflowers. habitats. A wide variety of physical and chemical defenses predict resistance to different insect herbi- vores, fungal pathogens, and a parasitic plant, suggesting that most sunflower defenses are not redundant in function and that wild Helianthus represents a rich source of variation for the improvement of crop sunflower. differentiation among plant populations and species (Fine et al., Introduction 2004; Agrawal et al., 2012; Zust€ et al., 2012). Over the past half Plants and their herbivores constitute over half of all described century, dozens of explanations have been put forward to account species, and the evolutionary arms race between these two groups for the broad interspecific variation observed in plant defenses, is hypothesized to explain much of the enormous global diversity although few have withstood empirical assessment across multiple in plant and herbivore species (Futuyma & Agrawal, 2009). Key systems (Stamp, 2003; Agrawal, 2007; Johnson, 2011). When plant traits known as defenses work to reduce herbivore damage considering the evolutionary radiation of a group of species into and improve fitness in the face of herbivore pressure (Stamp, broadly distributed and environmentally variable habitats, two 2003; Boege & Marquis, 2005; Carmona et al., 2011). The evo- major explanations of defense variation make the most testable lution of such defenses is known to have resulted in adaptive radi- predictions: the univariate trade-off model and the resource avail- ations (Farrell et al., 1991; Agrawal et al., 2009a), and plant– ability hypothesis. herbivore interactions have become a major focus of evolutionary The univariate trade-off model is central to many major ecology (Agrawal, 2011; Johnson, 2011). Because plants mediate defense hypotheses (Agrawal, 2007). Because investment in the primary flow of energy into almost all terrestrial ecosystems, defense comes at the expense of growth (Bazzaz et al., 1987), the the plant–herbivore interaction is the foundation of nearly all ter- univariate trade-off model predicts that trade-offs will exist restrial food webs and is thus arguably one of the most important among defenses such that only one defense performing a particu- ecological processes on Earth. In addition to reducing herbivory, lar protective function will be invested in by a plant at any given many plant defenses also reduce susceptibility to pathogen attack time, and all comparable redundant defenses will not be allocated (Levin, 1976; Lattanzio et al., 2006; Treutter, 2006), and thus resources because of energetic cost (Agrawal, 2007). Many exami- play multiple roles in determining plant fitness under pressure nations of species at community and global scales have explored from natural enemies. Consequently, both physical and chemical the possibility of trade-offs occurring among various defenses, defenses have been demonstrated to mediate adaptive but have generally found mixed support for univariate trade-offs Ó 2015 The Authors New Phytologist (2015) 1 New Phytologist Ó 2015 New Phytologist Trust www.newphytologist.com New 2 Research Phytologist (Steward & Keeler, 1988; Twigg & Socha, 1996; Koricheva under the resource availability hypothesis. One would therefore et al., 2004; Read et al., 2009). By contrast, if effective plant expect species with a more resource-acquisitive leaf economic defense is conferred by multiple defense traits acting together, we strategy to invest less in defense than species with a more should expect positive covariation among certain subsets of traits, resource-conservative strategy. However, the hypothesis of a leaf- forming defense syndromes in which distantly related species level relationship between leaf economics and leaf defense invest- adopt similar multivariate defense phenotypes (Agrawal & Fish- ment has yet to be rigorously tested. bein, 2006; Agrawal, 2007). Potential examples of such syn- Here, we investigated the evolution of leaf defenses and puta- dromes include convergent strategies for defending against tively defensive secondary metabolites across the genus different feeding guilds of herbivores – such as chewing versus Helianthus (the sunflowers). Sunflowers are a diverse group of piercing-sucking insects – or convergent defense strategies species that have radiated into a wide variety of habitats through- favored in different habitats or in conjunction with different life out North America, including deserts, grasslands and prairies, history characteristics. The largest world-wide analysis to date of evergreen and deciduous forests, freshwater wetlands and salt univariate trade-offs and defense syndromes in a phylogenetic marshes, coastal dunes, rock outcrops, and ruderal habitats context found little evidence for either trade-offs or syndromes at (Heiser et al., 1969). Many studies have explored physiological a global scale, but hypothesized that both could exist at lower adaptation to variation in abiotic environmental conditions in levels of evolutionary organization, such as within individual gen- wild sunflowers (Rosenthal et al., 2002; Sambatti & Rice, 2007; era (Moles et al., 2013). Donovan et al., 2009; Kawakami et al., 2011; Brouillette et al., The resource availability hypothesis (also known as the growth 2014; Mason & Donovan, 2015b), but little work has investi- rate hypothesis) attempts to explain variation in plant defense gated how members of Helianthus have differentiated in response through two primary mechanisms – inherent growth rate and to biotic pressures such as herbivory or disease (Fig. 1). Here, we resource availability. First, this hypothesis predicts that defense use a phylogenetic comparative approach to examine: (1) whether variation occurs as a result of differences in the cost–benefit ratio there are univariate trade-offs or syndromes in leaf defenses across of investment in defenses as a function of inherent plant growth Helianthus; (2) how leaf defenses relate to the leaf economics rate (Coley et al., 1985; Coley, 1987; Stamp, 2003; Endara & spectrum; (3) how leaf defenses vary across environmental gradi- Coley, 2011). For inherently fast-growing species, investing in ents; and (4) how leaf defense traits predict resistance to known defenses has the potential to reduce growth much more than in sunflower herbivores and pathogens, and accompanying plant inherently slow-growing species, and fast-growing species can performance under attack. more quickly replace leaf area lost to herbivory or disease (Coley et al., 1985). Second, under this hypothesis the inherent growth Materials and Methods rate of a species is assumed to be determined primarily by resource availability in the habitat to which it is adapted (Endara Study system & Coley, 2011). Under this assumption, a plant species adapted to a resource-rich environment would benefit more from invest- To examine the evolution of leaf defenses across Helianthus,we ing in growth than defense, as better access to water or nutrients selected 28 diploid nonhybrid species to make use of the most renders herbivory less costly (Horsfall & Cowling, 1980). Con- versely, a species adapted to a resource-poor environment would benefit more from a large investment in defenses, as resource lim- (a) (b) itation makes lost leaf tissue more difficult to replace. The resource availability hypothesis has been well supported by meta- analysis across studies of interspecific variation in defense (Endara & Coley, 2011), although there have been relatively few studies of this hypothesis in a phylogenetic context. Because of the explicit linkage of defense investment with growth rate and environmental resource availability, the resource availability hypothesis also offers the potential for explaining leaf defense variation in relation
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