Terpenes of Wild Sunflowers (Helianthus): An Effective Mechanism Against Seed Predation by Larvae of the Sunflower Moth, Homoeosoma electellum (Lepidoptera: Pyralidae)

Rogers, C. E.; Gershenzon, Jonathan; Ohno, Nobuo; Mabry, T. J.; Stipanovic, Robert D.; Kreitner, Gerald L.

doi:10.1093/ee/16.3.586

Cited by 56 publications

(45 citation statements)

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“…In cultivated sunflower breeding programs, ARG has been used widely as a donor of advantageous alleles for disease resistance (Heiser 1951;Rogers et al 1982;Gulya and Miller 1991;Slabaugh et al 2003;Dussle et al 2004;Radwan et al 2004;Seiler et al 2007;Wieckhorst et al 2010), fertility restoration of the PET1 cytoplasm (Chepurnaya et al 2003), and cytoplasmic male sterility (Horn et al 2002). ARG has also been identified as a possible source of favorable alleles for salt and drought tolerance (Richards 1992) and insect resistance (Rogers and Thompson 1980;Rogers et al 1982Rogers et al , 1987Sujatha and Lakshminarayana 2007). Crosses between ANN and ARG produce vigorous offspring with reduced pollen viability (F 1 = 5-50% viable, BC 1 = 24-97% viable) and chromosomal abnormalities (Heiser 1951;Chandler et al 1986;Quillet et al 1995), resulting in restricted introgression in experimental crossing programs.…”

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confidence: 99%

Chromosomal Evolution and Patterns of Introgression inHelianthus

et al. 2014

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Knowledge of the nature and extent of karyotypic differences between species provides insight into the evolutionary history of the genomes in question and, in the case of closely related species, the potential for genetic exchange between taxa. We constructed high-density genetic maps of the silverleaf sunflower (Helianthus argophyllus) and Algodones Dune sunflower (H. niveus ssp. tephrodes) genomes and compared them to a consensus map of cultivated sunflower (H. annuus) to identify chromosomal rearrangements between species. The genetic maps of H. argophyllus and H. niveus ssp. tephrodes included 17 linkage groups each and spanned 1337 and 1478 cM, respectively. Comparative analyses revealed greater divergence between H. annuus and H. niveus ssp. tephrodes (13 inverted segments, 18 translocated segments) than between H. annuus and H. argophyllus (10 inverted segments, 8 translocated segments), consistent with their known phylogenetic relationships. Marker order was conserved across much of the genome, with 83 and 64% of the H. argophyllus and H. niveus ssp. tephrodes genomes, respectively, being syntenic with H. annuus. Population genomic analyses between H. annuus and H. argophyllus, which are sympatric across a portion of the natural range of H. annuus, revealed significantly elevated genetic structure in rearranged portions of the genome, indicating that such rearrangements are associated with restricted gene flow between these two species.C HROMOSOMAL rearrangements are of considerable interest because they are often associated with barriers to gene flow between related species, either due to their direct effects on the fitness of heterozygotes or through the indirect effects of genic barriers embedded within them (White 1978;Barton and Bengtsson 1986;Rieseberg et al. 1995bRieseberg et al. , 1999Rieseberg 2001;Navarro and Barton 2003;Kirkpatrick and Barton 2006; reviewed in Faria and Navarro 2010;Gimenez et al. 2012). As such, detailed information on karyotypic differences between species provides insight into the nature of reproductive isolation and, more pragmatically, informs attempts to introgress beneficial alleles from wild species into crop gene pools (Chetelat and Meglic 2000;Foulongne et al. 2003;Dirlewanger et al. 2004). An improved understanding of synteny across species can also facilitate the identification and localization of functionally important genes in a taxon of interest through the extrapolation of gene order from model species (e.g., Choi et al. 2004;Dilbirligi et al. 2006).The genus Helianthus, which is composed of 49 species native to the Americas (Timme et al. 2007) and includes cultivated sunflower (Helianthus annuus L.; 2n = 2x = 34; hereafter referred to as ANN), has emerged as a model for genetic studies of adaptation, hybridization, and speciation (Rieseberg et al. 1995a,b;Lai et al. 2005;Reagon and Snow 2006;Massinga et al. 2009;Gutierrez et al. 2010;Vekemans 2010;Roumet et al. 2013). Insight into the nature and extent of reproductive barriers within Helianthus will ...

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Chromosomal Evolution and Patterns of Introgression inHelianthus

et al. 2014

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“…Wild sunßowers generally have anthocyanin in stems and leaf petioles, but are generally absent in cultivated sunßower. Wild sunßowers also differ in their composition of diterpenoids and sesquiterpene lactones that have been shown to be feeding deterrents and toxins against several sunßower herbivores (Gershenzon et al 1985, Rogers et al 1987. The growth phenology of cultivated sunßowers has been changed such that there is discrete emergence caused by uniform planting dates instead of the variable emergence patterns of the many different sunßower species.…”

Section: Discussionmentioning

confidence: 99%

“…Whether these two sunßower species differ in their attractiveness to parasitoids (e.g., Turlings and Wäckers 2004) or their negative effects on parasitoid Þtness (e.g., Ode 2006) are unexplored possibilities. Sesquiterpene lactones and diterpene acids are common in most wild populations of sunßowers and associated with reduced Þtness of the sunßower moth, Homoeosoma electellum (Hulst) (Rossiter et al 1986, Rogers et al 1987.…”

Section: Discussionmentioning

confidence: 99%

Sunflower Stem Weevil and Its Larval Parasitoids in Native Sunflowers: Is Parasitoid Abundance and Diversity Greater in the U.S. Southwest?

Ode¹,

Charlet

Seiler

2011

Environ Entomol

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Classical biological control programs often target a pest's region of origin as a likely source for new biological control agents. Here, we use this approach to search for biological control agents of the sunflower stem weevil (Cylindrocopturus adspersus LeConte), an economically important pest of commercial sunflower. We conducted surveys of weevil natural enemy diversity and abundance across a transect running from the northern Great Plains to the southwestern U.S. (the presumed area of endemism of annual sunflower species in the genus Helianthus). Accordingly, natural enemy diversity and abundance were expected to be greater in the southwestern U.S. C. adspersus and their larval parasitoids were collected from stems of four native sunflower species (Helianthus annuus, H. nuttallii, H. pauciflorus, and H. petiolaris) from 147 sites across eight states. Native H. annuus constituted the majority of the sunflower populations. Mean weevil densities were significantly higher in sunflower stalks that were larger in diameter. Mean weevil densities within sites did not differ across the range of longitudes and latitudes sampled. After accounting for the effects of stalk diameter and location, weevil densities did not differ among the four sunflower species nor did they differ as a function of elevation. C. adspersus in H. annuus and H. petiolaris were attacked by seven species of parasitoids. No parasitoids were found attacking C. adspersus in H. nuttallii or H. pauciflorus stalks. C. adspersus were twice as likely to be attacked by a parasitoid when feeding on H. petiolaris than H. annuus. Furthermore, the likelihood that C. adspersus would be parasitized decreased with increasing elevation and increasing stem diameters. All parasitoid species have been previously reported attacking C. adspersus larvae in cultivated sunflower. Species richness was less diverse in these collections than from previous studies of cultivated sunflower. Our findings suggest that the species of larval parasitoids attacking C. adspersus in native sunflowers have successfully made the transition to cultivated sunflower.

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“…Four diterpenoids were quantiÞed in the study: atisanol, trachylobanoic acid, kauranol, and kaurenoic acid. These compounds were chosen for quantiÞcation because the two alcohols elicit oviposition by female banded moths (Morris et al 2005), whereas the two acids are toxic to larvae of the sunßower moth, Homeosoma electellum (Hulst), at concentrations in the range at which they are found in R5-stage sunßower inßorescences (Rogers et al 1987). Thus, their concentrations in tissue from the germplasm used in this study may relate to banded sunßower moth female preference and larval survival, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…The percentage of larvae parasitized was also determined to assess any indirect effects of plant resistance on the development of larval parasitoids of C. hospes. Finally, in the Þrst year of study (2005) only, a number of diterpenoids, which either stimulate oviposition (Morris et al 2005) or are potentially toxic to larvae (Rogers et al 1987), were quantiÞed in bracts and ßorets to determine whether amounts of these involatile chemicals inßuenced ovipositional preference or larval performance of C. hospes.…”

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confidence: 99%

Ovipositional Preference and Larval Performance of the Banded Sunflower Moth (Lepidoptera: Tortricidae) and Its Larval Parasitoids on Resistant and Susceptible Lines of Sunflower (Asterales: Asteraceae)

et al. 2014

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Banded sunflower moth, Cochylis hospes Walsingham, is one of the most destructive seed-feeding insect pests of sunflowers, causing significant economic yield losses in the northern Great Plains. In an attempt to understand host-plant resistance mechanisms for this pest, we field-tested, over several years, the effects of seven sunflower accessions, rated as resistant to C. hospes in previous screening trials, and a susceptible control (Par 1673-2), on the ovipositional preference and larval performance of C. hospes and its larval parasitoids. Of the resistant accessions, PI 494859 was the most preferred for oviposition, receiving a significantly greater number of eggs per head than did the susceptible Par 1673-2 in 2 of 3 yr. However, the numbers of larvae, and consequently the rate of seed infestation, found in PI 494859 heads were significantly lower than those in Par 1673-2 heads over all 3 yr. Female moths laid relatively few eggs on accessions PI 170385, 291403, and 251902, compared with on Par 1673-2, resulting in lower numbers of larvae per head and lower percentages of seed damaged. No association was observed between the concentrations of two diterpenoid alcohols or two diterpenoid acids in sunflower bracts and the numbers of eggs laid on the heads of the accessions. The number of banded sunflower moth larvae and the proportion of seeds damaged were positively correlated with kaurenoic acid concentrations and negatively correlated with kauranol concentrations. A positive association between resistance to larval feeding and parasitism was found in years 2006 and 2008, with resistant accessions having significantly greater proportions of parasitized larvae than did the susceptible Par 1673-2.

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Terpenes of Wild Sunflowers (Helianthus): An Effective Mechanism Against Seed Predation by Larvae of the Sunflower Moth, Homoeosoma electellum (Lepidoptera: Pyralidae)

Cited by 56 publications

References 0 publications

Chromosomal Evolution and Patterns of Introgression inHelianthus

Chromosomal Evolution and Patterns of Introgression inHelianthus

Sunflower Stem Weevil and Its Larval Parasitoids in Native Sunflowers: Is Parasitoid Abundance and Diversity Greater in the U.S. Southwest?

Ovipositional Preference and Larval Performance of the Banded Sunflower Moth (Lepidoptera: Tortricidae) and Its Larval Parasitoids on Resistant and Susceptible Lines of Sunflower (Asterales: Asteraceae)

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