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Local Adaptation in Four Iris Species Tested in a Common-Garden Experimentbij 1265 267..277

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Local Adaptation in Four Iris Species Tested in a Common-Garden Experimentbij 1265 267..277 Biological Journal of the Linnean Society, 2009, 98, 267–277. With 6 figures Local adaptation in four Iris species tested in a common-garden experimentbij_1265 267..277 MICHAEL DORMAN*, YUVAL SAPIR† and SERGEI VOLIS Life Sciences Department, Ben-Gurion University of the Negev, PO Box 653, Beer Sheva 84105, Israel Received 11 February 2009; accepted for publication 25 March 2009 Local adaptation is a commonly observed result of natural selection acting in heterogeneous environment. Common-garden experiments are a method of detecting local adaptation, as well as studying phenotypic plasticity and gradients of traits. The present study aimed to analyse reaction norms of four closely-related Iris species of section Oncocyclus and to identify a role of environmentally-specific natural selection in their plastic responses. The plant vegetative and phenological, as well as performance traits were measured in a full factorial common-garden experiment with three levels of water amount and three soil types. We found a significant effect of species identity on all traits measured. Water amount and soil type affected many of the traits, but soil type did not affect the performance. There was no significant difference in the effect of water amount and soil type on performance as reflected by rhizome growth; in other words, there was no significant genotype ¥ environment interaction for performance. Plasticity levels and directions of response were also similar among the species. We conclude that phenotypic differences among species are of genetic origin, although no adaptive value was demonstrated for them at the time and life-stages ‘frame’ of this experiment. © 2009 The Linnean Society of London, Biological Journal of the Linnean Society 2009, 98, 267–277. ADDITIONAL KEYWORDS: genotype by environment interaction – natural selection – Oncocyclus – phenotypic plasticity – reaction norm. INTRODUCTION (Barton & Partridge, 2000). Gene flow, which is related primarily to seed and pollen dispersal in The geographical range that a species occupies is the plants, has a homogenizing effect on genetic varia- result of both selective and nonselective evolutionary tion, preventing the differentiation of populations forces. Local adaptation is a result of natural selec- (Lenormand, 2002; Goldberg & Lande, 2007). Another tion, which, by acting on genotypes in different two factors comprise genetic drift and mutations, environmental settings, creates adaptive genetic dif- which can overwhelm differences in selection and ferentiation. Different populations then evolve differ- confound the possibility of local adaptation, or even ent trait values, which provides them with a fitness lead to foreign genotype advantage (Hereford & Winn, advantage in their native environment, which is 2008). evident as a genotype ¥ environment interaction for There are other reasons for a lack of local adapta- fitness (Kawecki & Ebert, 2004). tion. One is temporal variation in selection, which can However, local adaptation of populations or related favour a generalist with high phenotypic plasticity species is not always the evolutionary outcome as a (Gomulkiewicz & Kirkpatrick, 1992). Therefore, local result of several factors that limit natural selection adaptation requires costs or limits on phenotypic plasticity: the cost of maintaining the genetic and *Corresponding author. cellular machinery necessary to be plastic (Scheiner, E-mail: [email protected] 1993). This provides a fitness advantage for a geno- †Current address: Porter School for Environmental Studies and Department of Plant Sciences, Tel Aviv University, Tel type in some, but not all environments, although Aviv, 69978, Israel these costs are difficult to demonstrate (DeWitt, Sih & © 2009 The Linnean Society of London, Biological Journal of the Linnean Society, 2009, 98, 267–277 267 268 M. DORMAN ET AL. Wilson, 1998; Van Kleunen & Fischer, 2001; Caruso, laboratory and the measurements obtained can be Maherali & Sherrard, 2006; Volis, 2009; but see also used as a surrogate for fitness in studies of adaptation, Bell & Galloway, 2008). even though they need to be complemented by mea- Another prerequisite for local adaptation is the suring the relationship of the performance components presence of sufficient genetic variation on which selec- to fitness (Arnold, 1983). This relation of performance tion can act (Houle, 1992). Models predict that the and fitness is eminently logical; however, it has never extent and structure of genetic variation within a been fully evaluated (Primack & Kang, 1989). species may affect the evolutionary trajectory and the In the present study, we present the results equilibrium of its reaction norm (Gomulkiewicz & obtained in an experiment aiming to test local adap- Kirkpatrick, 1992) and therefore the possibility of tation and plasticity in four Oncocyclus Iris species. local adaptation to evolve. These are endangered perennial herbs that are Detecting local adaptation is performed experimen- among the important plants for conservation in Israel tally by comparing the reaction norm (of performance (Sapir, Shmida & Fragman, 2003; Shmida & Pollak, or fitness) of genotypes across environments (Pigli- 2007). Despite a growing knowledge of the Oncocyclus ucci, 2001). There are two main types of experiment irises (e.g. morphological: Shimshi, 1980; Sapir et al., (Kawecki & Ebert, 2004). One comprises a reciprocal 2002; cytological: Avishai, 1977; genetic variation: transplant, which is conducted in the field, with each Arafeh et al., 2002; pollination biology: Sapir, Shmida genotype being tested in its own native habitat and & Ne’eman, 2005; Sapir, Shmida & Ne’eman, 2006), the native habitats of the other genotypes. Usually, their evolutionary history and the causes of their this is the best option because all properties of the current discontinuous distribution remain to be habitats are present, but it is not always feasible as studied. Sapir et al. (2002) studied morphological a result of logistical and conservation reasons. The variation in 42 natural populations of nine Iris other is a common-garden experiment, in which some species of the section Oncocyclus. Most of the floral properties of the environment are recreated in the and vegetative characters showed directional change laboratory or greenhouse (or in the field; Bell & in 12 populations of three of these species that were Galloway, 2008) and all the genotypes are tested in distributed along the aridity gradient in Israel: Iris different treatments of these properties. On the one atrofusca (Baker), Iris petrana (Dinsmore; both are hand, the results obtained may not reflect the situa- used in the present study as well), and Iris haynei tion in reality if some important properties of the (Baker). The directional change observed was in environment are missing. On the other hand, a accordance with known adaptations to aridity (i.e. common-garden experiment enables specific hypoth- decrease in size and organ dimensions; increase in eses about the environmental properties and process leaf curvature), which led to the hypothesis of natural of adaptation to be tested. Therefore, these two selection shaping this variation, resulting in local experimental approaches can be viewed as comple- adaptation. In the present study, we add to the infor- mentary (Pigliucci, 2001; Volis, Mendlinger & Ward, mation provided by the study of Sapir et al. (2002) in 2002a; Volis, Mendlinger & Ward, 2002b; Byars, two respects. The first is testing for local adaptation Papst & Hoffmann, 2007). by measurements of performance in an array of envi- Common-garden experiments have been efficiently ronmental conditions. The second is measuring the used in analysis of inter- and intraspecific phenotypic amount and direction of phenotypic plastic responses, variation (e.g. studies of intraspecific variation: Schli- possibly an adaptive trait as well. To accomplish this, chting & Levin, 1990; Volis et al., 2002b; Rutter & we conducted a common-garden experiment with four Fenster, 2007; Bell & Galloway, 2008; Suzuki, 2008; Iris species and measured morphological, pheno- studies of interspecific variation: Zangerl & Bazzaz, logical, and performance traits in different com- 1984; Macdonald, Chinnappa & Reid, 1988; Wright & binations of three treatments for each of two Westoby, 1999; Ackerly et al., 2000; Caruso et al., environmental factors that we knew to vary in the 2006). irises natural habitats: water amount and soil type. The measurement of relative fitness of individuals, Our main question was: are soil types, water defined as ‘the relative number of offspring contributed amount, or their combination, the major environmen- to the next generation by particular individuals or tal factors responsible for species adaptation and genotypes’ (Primack & Kang, 1989), should be per- their boundaries of distribution? formed over the whole life-cycle of a plant. This is impractical in many cases, especially when the species MATERIAL AND METHODS in question is perennial. Instead, it is common to measure performance traits, such as seed germination, STUDY SYSTEM vegetative growth, probability of flowering, seed pro- We studied local adaptation in four species of Iris duction, and survival. This can be conducted in the section Oncocyclus. These are perennial rhizomatous © 2009 The Linnean Society of London, Biological Journal of the Linnean Society, 2009, 98, 267–277 LOCAL ADAPTATION IN IRIS 269 plants, with approximately 33 species (Rix, 1997) that are distributed throughout the Middle
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