Interspecific variation of phenolic concentrations in persistent leaves among six taxa from subgenus Tridentatae of Artemisia (Asteraceae)

Wilt, F. Martin; Geddes, Jason D.; Tamma, Rama V.; Miller, Glenn C.; Everett, Richard L.

doi:10.1016/0305-1978(92)90071-k

Cited by 23 publications

(9 citation statements)

References 7 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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“…1) in western North America [15]. Sagebrush foliage is rich in toxic monoterpenes [16][17][18][19][20][21], phenolics [20,22], and sesquiterpene lactones [23] that inhibit browsing by ungulates [24][25][26]. The greater sage-grouse feeds exclusively on evergreen sagebrush foliage in the winter and browses frequently on sagebrush during snow-free months [27].…”

Section: Introductionmentioning

confidence: 99%

Distinct microbiotas of anatomical gut regions display idiosyncratic seasonal variation in an avian folivore

et al. 2019

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Background: Current knowledge about seasonal variation in the gut microbiota of vertebrates is limited to a few studies based on mammalian fecal samples. Seasonal changes in the microbiotas of functionally distinct gut regions remain unexplored. We investigated seasonal variation (summer versus winter) and regionalization of the microbiotas of the crop, ventriculus, duodenum, cecum, and colon of the greater sage-grouse (Centrocercus urophasianus), an avian folivore specialized on the toxic foliage of sagebrush (Artemesia spp.) in western North America. Results: We sequenced the V4 region of the 16S rRNA gene on an Illumina MiSeq and obtained 6,639,051 sequences with a median of 50,232 per sample. These sequences were assigned to 457 bacterial and 4 archaeal OTUs. Firmicutes (53.0%), Bacteroidetes (15.2%), Actinobacteria (10.7%), and Proteobacteria (10.1%)were the most abundant and diverse phyla. Microbial composition and richness showed significant differences among gut regions and between summer and winter. Gut region explained almost an order of magnitude more variance in our dataset than did season or the gut region × season interaction. The effect of season was uneven among gut regions. Microbiotas of the crop and cecum showed the greatest seasonal differences. Conclusions: Our data suggest that seasonal differences in gut microbiota reflect seasonal variation in the microbial communities associated with food and water. Strong differentiation and uneven seasonal changes in the composition and richness of the microbiota among functionally distinct gut regions demonstrate the necessity of wider anatomical sampling for studies of composition and dynamics of the gut microbiota.

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“…nova, A. pygmaea, A. rigida, A. rothrockii, A. tridentata, and A. tripartita). Several authors, e.g., McKell (1983, 1986), Shultz (1983Shultz ( , 1986, and Wilt et al, (1992), have accepted this proposal. Others, e.g., Kornkven, Watson, and Estes (1998), have opted to treat Tridentatae at the sectional level.…”

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confidence: 99%

Cytogeography and chromosome evolution of subgenusTridentataeofArtemisia(Asteraceae)

McArthur

Sanderson

1999

American J of Botany

119

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The subgenus Tridentatae of Artemisia (Asteraceae: Anthemideae) is composed of 11 species of various taxonomic and geographic complexities. It is centered on Artemisia tridentata with its three widespread common subspecies and two more geographically confined ones. Meiotic chromosome counts on pollen mother cells and mitotic chromosome counts on root tips were made on 364 populations ( = 3.1 plants per population). These population counts are ∼60% of all Tridentatae counts. Some are first records for taxa. The Tridentatae are a polyploid complex (x = 9) with ploidy levels from 2x to 8x, but mostly 2x (48%) and 4x (46%). Polyploidy occurs in nine of the 11 species and in many subspecies as well. Supernumerary or b chromosomes are present only at a low frequency. In the principal species, A. tridentata, 2x plants are larger than 4x ones, which are adapted to drier conditions, probably in consequence of their slower growth rates. Gigas diploidy is a phenomenon shared by some other woody genera, but is in contrast to the gigas polyploid nature of many herbaceous genera. Polyploidy occurs within populations and is essentially autoploid. Hybridization sometimes occurs at taxa interfaces in stable hybrid zones. Stable Tridentatae hybrid zones coupled with the group's inherent propensity for polyploidization has led to the establishment of a geographically and numerically large and successful complex of species.

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Interspecific variation of phenolic concentrations in persistent leaves among six taxa from subgenus Tridentatae of Artemisia (Asteraceae)

Cited by 23 publications

References 7 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

Distinct microbiotas of anatomical gut regions display idiosyncratic seasonal variation in an avian folivore

Cytogeography and chromosome evolution of subgenusTridentataeofArtemisia(Asteraceae)

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