Narrow hybrid zone between two subspecies of big sagebrush, Artemisia tridentata (Asteraceae). VIII. Spatial and temporal pattern of terpenes

Byrd, D. W.; McArthur, E. Durant; Wang, Han; Graham, John H.; Freeman, D. Carl

doi:10.1016/s0305-1978(98)00064-7

Cited by 16 publications

(12 citation statements)

References 51 publications

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“…They differ in growth rate, secondary chemistry, reproductive effort, and other potential fitness components (McArthur et al 1988;Wilt et al 1992;Weber et al 1994;Byrd et al 1999). Basin big sagebrush, A. tridentata ssp.…”

Section: Source Populations and Common Gardenmentioning

confidence: 99%

Trade-off between plant growth and defense? A comparison of sagebrush populations

et al. 2002

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We used ecotypic variation in big sagebrush (Artemisia tridentata) to examine potential trade-offs between inherent growth rate and tolerance or resistance to herbivory. Seeds were obtained from seven geographic populations, and 1,120 seedlings were established in a common garden. In one set of plots, plants were subjected to five treatments: control, regular insecticide spray, moderate browsing, severe browsing, or moderate browsing plus insecticide. Plants in a second set of plots were all untreated, and were used to estimate ambient growth, flower production, and susceptibility to herbivorous insects. In the first growing season, population differences in relative growth rate produced approximately seven-fold variation in mean biomass. Two populations of basin big sagebrush (A. tridentata tridentata) and one population of mountain big sagebrush (A. tridentata vaseyana) grew fastest; those of Wyoming big sagebrush (A. tridentata wyomingensis) showed the slowest growth. Bi-weekly application of insecticide for two growing seasons had no effect on the growth of either browsed or unbrowsed plants. All populations showed compensatory growth (but not overcompensation) in response to browsing, but the degree of compensation was unrelated to inherent growth rate. Similarly, there was no consistent relationship between plant growth rate and flower production in the second growing season. Some insects colonized fast-growing populations more frequently than slow-growing ones, but patterns of insect colonization were species-specific. At the level of geographic populations and subspecies, we found little evidence of a built-in trade-off between inherent growth rate and the ability to tolerate or resist herbivory. Because population ranks for growth rate changed substantially between seasons, attempts to correlate growth and defense characters need to account for differences in the growth trajectories of perennial plants.

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Section: Source Populations and Common Gardenmentioning

confidence: 99%

Trade-off between plant growth and defense? A comparison of sagebrush populations

et al. 2002

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“…Because terpenes are inherited in a simple Mendelian fashion (McArthur et al 1988;Weber et al 1994), variation across the hybrid zone should be clinal. Indeed, Byrd et al (1999) demonstrated clinal variation in terpene composition across the big sagebrush hybrid zone at Salt Creek, suggesting that most terpenes exhibit additive genetic variance. Nevertheless, some hybrids studied by Byrd et al (1999) produced novel terpenes, or failed to produce terpenes common to both parental taxa.…”

Section: Discussionmentioning

confidence: 99%

“…Indeed, Byrd et al (1999) demonstrated clinal variation in terpene composition across the big sagebrush hybrid zone at Salt Creek, suggesting that most terpenes exhibit additive genetic variance. Nevertheless, some hybrids studied by Byrd et al (1999) produced novel terpenes, or failed to produce terpenes common to both parental taxa. This unexpected variation may result from either epistatic genetic variation or gene-environment interaction.…”

Section: Discussionmentioning

confidence: 99%

“…The hybrids occur where the subspecies overlap, and introgression is bidirectional (McArthur et al 1988). The parental taxa differ in morphology (Freeman et al 1991), biochemistry (Welch and McArthur 1981;McArthur et al 1988;Freeman et al 1991;Byrd et al 1999), andDNA markers (McArthur et al 1998b). Moreover, the hybrid zone is well characterized with respect to herbivory and reproduction , developmental instability , soil properties (Wang 1996;Wang et al 1998), respiration and water potential (McArthur et al 1998a), plant community composition (Wang 1996;Freeman et al 1999b), nutrient uptake (Wang 1996;Wang et al 1999), and growth (Freeman et al 1999a).…”

Section: Big Sagebrush Hybrid Zonementioning

confidence: 99%

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Narrow hybrid zone between two subspecies of big sagebrush (Artemisia tridentata: Asteraceae)

2001

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Several species of gall-forming insects specialize on big sagebrush (Artemisia tridentata), a species that shows much clinal and subspecific variation throughout its geographic range. Two of those subspecies, basin big sagebrush (A. t. ssp. tridentata) and mountain big sagebrush (A. t. ssp. vaseyana), form a narrow hybrid zone at Salt Creek, Utah. Reciprocal transplant experiments have shown that the hybrid big sagebrush at Salt Creek are more fit than either parental subspecies, but only in the hybrid zone. Do genotype and environment influence the density and distribution of galls on big sagebrush? We counted galls on parental and hybrid big sagebrush in three reciprocal transplant gardens at Salt Creek. Gardens were in each of the two parental zones and in the hybrid zone. Transplanted seedlings came from five source populations: two parental and three hybrid populations. We identified seven kinds of gall-forming flies (Rhopalomyia midges and Eutreta fruitflies) that produced identifiable galls. Densities of galls varied among the three gardens and five source populations, and there was also a significant garden by source interaction in gall density. In general, variation in gall density among gardens (i.e., environments) was much greater than the variation among source populations (i.e., genotypes). Nevertheless, significant genotype-environment interactions were observed for five of the seven kinds of galls. Overall density of galls, mostly due to Rhopalomyia ampullaria, was greatest in the high-elevation (mountain) garden and least in the low-elevation (basin) garden. To the best of our knowledge, this is the first reciprocal transplant experiment addressing herbivore richness in a hybrid zone.

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“…Concentrations and profiles of carbon-based plant secondary metabolites in woody plant species typically vary within and among plants ( Barnola et al, 1997;Byrd et al, 1999). Biotic and abiotic factors and stressors (e.g., light intensity/wavelength, soil moisture/nutrients, herbivory/mechanical damage, etc.)…”

Section: Introductionmentioning

confidence: 99%

Within-plant distribution of volatile compounds on the leaf surface of Flourensia cernua

Estell¹,

James²,

Fredrickson³

et al. 2013

Biochemical Systematics and Ecology

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Narrow hybrid zone between two subspecies of big sagebrush, Artemisia tridentata (Asteraceae). VIII. Spatial and temporal pattern of terpenes

Cited by 16 publications

References 51 publications

Trade-off between plant growth and defense? A comparison of sagebrush populations

Trade-off between plant growth and defense? A comparison of sagebrush populations

Narrow hybrid zone between two subspecies of big sagebrush (Artemisia tridentata: Asteraceae)

Within-plant distribution of volatile compounds on the leaf surface of Flourensia cernua

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