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Identification of Sterile, Noninvasive Cultivars of Japanese Spirea

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Identification of Sterile, Noninvasive Cultivars of Japanese Spirea HORTSCIENCE 44(7):2031–2034. 2009. North America (Bowen et al., 2002; Garrett, 2007; Jog and Delong, 2005; USDA Forest Service, 2007) and Europe (Essl, 2005). Identification of Sterile, Noninvasive Eliminating fertile Japanese spirea cultivars, at least in areas where this species has dem- Cultivars of Japanese Spirea onstrated the potential to naturalize, may be 1 of particular importance early in the invasion Rhiannon L. Wilson and William A. Hoch process when multiple introductions, genetic Montana State University, Department of Plant Sciences and Plant Pathology, recombination, and local selection are taking 324 Leon Johnson Hall, Bozeman, MT 59717 place, potentially contributing to the evolu- tion of highly invasive populations. Additional index words. Spiraea japonica, Spiraea ·bumalda, sterility, introduced species, In this study, 20 commonly available DNA content cultivars of S. japonica were evaluated for Abstract. Japanese spirea (Spiraea japonica L. f.), a popular landscape shrub, has shown fertility by measuring the germination of the potential to become an invasive weed in both North America and Europe. Twenty pollen and open-pollinated seed from plants commonly available S. japonica cultivars were evaluated for fertility using pollen and grown in a replicated field plot. In addition, seed germination. Clones were grown in a randomized, replicated field plot, and seed collected from commercial nurseries additional seed samples were obtained from commercial nurseries and hand-pollinations were tested, and plants demonstrating steril- in the greenhouse. Three sterile cultivars were identified: ‘Crispa’, ‘Dart’s Red’, and ity in the test plot were pollinated under ‘Neon Flash’. These cultivars demonstrated poor anther dehiscence and very low mean controlled conditions in the greenhouse. The pollen germination, 2.7%, 3.0%, and 1.3%, respectively, which often produced abnormal DNA content of all clones was determined pollen tubes. None of these three cultivars produced viable seed in the field plot, at using flow cytometry. commercial nurseries, or when hand-pollinated in the greenhouse, whereas seed germination from fertile clones ranged from 91.5% to 100%. The other 17 cultivars Materials and Methods tested, which should be treated as entirely fertile for the purposes of invasive plant management, were ‘Albiflora’, ‘Anthony Waterer’, ‘Candlelight’, ‘Dakota Goldcharm’, Plant material. Eighteen cultivars of S. var. alpina ‘Daphne’, ‘Flaming Mound’, ‘Flowering Choice’, ‘Froebelii’, ‘Golden japonica were maintained at the Montana Princess’, ‘Goldflame’, ‘Goldmound’, ‘Gumball’, ‘Lemon Princess’, ‘Little Princess’, State University Horticulture Farm, Bozeman, ‘Magic Carpet’, ‘Norman’, and ‘Shibori’. Measurements of DNA content indicated that MT, in a randomized complete block design all tested clones are diploid; therefore, the observed sterility was not related to poly- with three replicated blocks. All plants in the ploidy. The identification of these three sterile cultivars can help reduce the use of fertile field plot were obtained from Bailey Nurser- varieties in areas where Japanese spirea has shown the potential to become invasive. ies (St. Paul, MN). Two clones that were not available when the field plot was planted, ‘Candlelight’ and ‘Lemon Princess’, were acquired from Forest Farm (Williams, OR) The escape and establishment of exotic its adaptability, ease of culture, and desirable and three replicates of each were maintained plants from ornamental landscapes is causing ornamental characteristics (Dirr, 1998). Sales in the greenhouse for analysis of pollen and significant ecosystem and environmental dam- of Spiraea species and cultivars, the majority seed germination and DNA content. Three age throughout much of the United States. of which are S. japonica, rank second only cultivars that demonstrated sterility in our These nonnative plants have affected natural to roses in total sales of deciduous ornamen- test plot, ‘Crispa’, ‘Dart’s Red’, and ‘Neon ecosystems in a variety of ways, including tal plants in the United States [U.S. Depart- Flash’, were further tested through hand- a reduction in diversity through the displace- ment of Agriculture (USDA), 1998]. pollinations in the greenhouse. For these ment of native species, reduced soil stability Unfortunately, Japanese spirea has also pollinations, container-grown plants of and water quality, interference with plant suc- shown the potential to become an invasive ‘Dart’s Red’ were obtained from Means cession dynamics and wildlife habitat and weed, naturalizing in much of the eastern Nursery (Scappoose, OR) and ‘Crispa’ and foraging, and altered fire regimes and nutrient United States (USDA, 2009). ‘Neon Flash’ from Bailey Nurseries (St. Paul, cycling (Dukes and Mooney, 2004; Mack A number of state governments have MN). All pollen and seed samples were et al., 2000; Raizada et al., 2008). Economic banned, or are in the process of banning, the collected during 2008. costs associated with invasive plants total import and sale of invasive ornamentals Pollen germination. Pollen germination more than $120 billion annually (Pimentel (Mehrhoff et al., 2003). An alternative to was measured for each of the three replicate et al., 2005). Many of these exotic species, banning the sale of Japanese spirea would plants for all cultivars in the field test plot particularly among woody plants, originated be the use of sterile, noninvasive clones. The between 15 July and 8 Aug. 2008. Pollen as ornamental introductions. Reichard (1997) availability of sterile cultivars would precipi- from ‘Candlelight’ and ‘Lemon Princess’ determined that 85% of invasive woody tate the elimination of fertile varieties from was obtained from each of three replicates plants were originally introduced for land- commerce in areas where it has shown the in the greenhouse. At anthesis, pollen from scape purposes. potential to become invasive. one inflorescence was sprinkled onto pollen Japanese spirea, Spiraea japonica L. f. Invasions of exotic species are often germination media by gently tapping the (synonym S. ·bumalda) has become an ex- marked by a lag time between initial coloni- inflorescence directly above the surface of tremely popular landscape plant as a result of zation and the onset of rapid population the media. Pollen germination media con- growth and range expansion (Sakai et al., sisted of 1.6 mM H3BO3, 1.3 mM Ca(NO3)2, 2001). There is compelling evidence that 0.8 mM MgSO4Á7H20, 0.6 mM MnSO4Á1H20, many, if not most, successful invasions are 1mM KNO3, 15% sucrose, and 1% agar. Received for publication 8 June 2009. Accepted for preceded by multiple introduction events that After 8 h of incubation at 23 °C, the percent- publication 21 July 2009. provide allelic variation that drives adaptive age of germinated pollen grains was deter- We thank Bailey Nurseries and Means Nursery for evolution (Culley and Hardiman, 2007; mined from 100 total grains on randomly donation of plant material and Cross Nurseries Inc., Durka et al., 2005; Lavergne and Molofsky, selected sections of the petri dish observed at Johnson’s Nursery Inc., Lawyer Nursery Inc., McKay Nursery, and Sampson Nursery for seed. 2007; Pe´rez de la Vega et al., 1991; Prentis 100· magnification using an Olympus mi- We also thank Dr. J. Spencer Johnston at Texas et al., 2008; Sakai et al., 2001). Available croscope (Olympus America Inc., Center A&M University for his help with flow cytometry. evidence suggests that many populations of Valley, PA). A pollen grain was considered 1To whom reprint requests should be addressed; Japanese spirea are in the initial establish- to have germinated if a pollen tube was e-mail [email protected]. ment and/or lag phases of invasion both in visible and had a length that was equal to or HORTSCIENCE VOL. 44(7) DECEMBER 2009 2031 greater than the diameter of the pollen grain inside 100 · 15-mm petri dishes and wrapped those observed in pollen from triploid plants (Rajora and Zsuffa, 1986). with parafilm (Pechiney Plastic Packaging, such as stunted growth, twisting, and swelling Greenhouse pollinations. Three cultivars Menasha, WI). Petri dishes were placed on (Park et al., 2002). Anther dehiscence was also that demonstrated sterility in our test plot, a laboratory bench 1.2 m beneath a 400-W abnormal in these clones with the majority of ‘Crispa’, ‘Dart’s Red’, and ‘Neon Flash’, were high-pressure sodium vapor lamp (average anthers opening only partially or not at all. further evaluated through hand-pollinations in photon flux of 80 mmolÁm–2Ás–1) operating on This indicates that the pollen of these four the greenhouse. Because self-incompatibility an 18-h photoperiod. For all tests, seed germi- cultivars is mostly, if not entirely, nonviable. of Spiraea has not been characterized, and nation was recorded every 3 d until germina- Pollen from all other cultivars germinated our work from a previous study indicates that tion was complete (up to 8 weeks). at significantly higher rates and produced S. japonica is primarily an outcrossing spe- Flow cytometry. To release nuclei, fresh, normal pollen tubes. Pollen collected from cies (W. Hoch, unpublished data), each hand- newly expanded leaves of spirea samples the two greenhouse-grown cultivars, Candle pollination was performed using pollen from [30 mg fresh weight (FW)] and the DNA Light and Lemon Princess, displayed sig- two different clones. One inflorescence on standard (50 mg FW) were chopped to- nificantly higher germination percentages each of three replicates of the
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