Natural and Artificial Hybridization between Big Sagebrush (Artemisia tridentata) Subspecies

McArthur, E. Durant; Welch, Bruce L.; Sanderson, Stewart C.

doi:10.1093/oxfordjournals.jhered.a110508

Cited by 73 publications

(73 citation statements)

References 11 publications

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“…Throughout this range, several subspecies form stable hybrid zones in areas of contact, 16 usually along elevation gradients coincident with temperature and soil differences. 17 Two subspecies occur in Salt Creek Canyon, Utah, at elevations of <1,830 m (basin, A. t. ssp.…”

Section: Sexual Reproductionmentioning

confidence: 99%

Symbiotic regulation of plant growth, development and reproduction

Rodriguez

Freeman²,

McArthur

et al. 2009

Communicative & Integrative Biology

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The growth and development of rice (Oryzae sativa) seedlings was shown to be regulated epigenetically by a fungal endophyte. In contrast to un-inoculated (nonsymbiotic) plants, endophyte colonized (symbiotic) plants preferentially allocated resources into root growth until root hairs were well established. During that time symbiotic roots expanded at five times the rate observed in nonsymbiotic plants. Endophytes also influenced sexual reproduction of mature big sagebrush (Artemisia tridentata) plants. Two spatially distinct big sagebrush subspecies and their hybrids were symbiotic with unique fungal endophytes, despite being separated by only 380 m distance and 60 m elevation. A double reciprocal transplant experiment of parental and hybrid plants, and soils across the hybrid zone showed that fungal endophytes interact with the soils and different plant genotypes to confer enhanced plant reproduction in soil native to the endophyte and reduced reproduction in soil alien to the endophyte. Moreover, the most prevalent endophyte of the hybrid zone reduced the fitness of both parental subspecies. Because these endophytes are passed to the next generation of plants on seed coats, this interaction provides a selective advantage, habitat specificity, and the means of restricting gene flow, thereby making the hybrid zone stable, narrow and potentially leading to speciation.

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Section: Sexual Reproductionmentioning

confidence: 99%

Symbiotic regulation of plant growth, development and reproduction

Rodriguez

Freeman²,

McArthur

et al. 2009

Communicative & Integrative Biology

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“…tridentata or subsp. vaseyana , but the environments tend to have relatively lower annual precipitation and shallow soils ( McArthur et al, 1988 ;Kolb and Sperry, 1999 ). However, in zones or ecotones between mountain and basin habitats, homoploid hybrid swarms form between subsp.…”

mentioning

confidence: 99%

“…However, in zones or ecotones between mountain and basin habitats, homoploid hybrid swarms form between subsp. tridentata and vaseyana ( McArthur et al, 1988 ;Freeman et al, 1991 ). Subsequent reciprocal transplant studies along the ecotonal gradients have shown that hybrids between (e.g., McArthur and Sanderson, 1999 ), sympatry at the subspecies and ploidy levels is rare and occurs in narrow ecotones, and therefore, assessing three individuals per population was suffi cient.…”

mentioning

confidence: 99%

Deep sequencing of amplicons reveals widespread intraspecific hybridization and multiple origins of polyploidy in big sagebrush (Artemisia tridentata; Asteraceae)

Richardson

Page

Bajgain

et al. 2012

American J of Botany

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• Premise of the study: Hybridization has played an important role in the evolution and ecological adaptation of diploid and polyploid plants. Artemisia tridentata (Asteraceae) tetraploids are extremely widespread and of great ecological importance. These tetraploids are often taxonomically identified as A. tridentata subsp. wyomingensis or as autotetraploids of diploid subspecies tridentata and vaseyana. Few details are available as to how these tetraploids are formed or how they are related to diploid subspecies.• Methods: We used amplicon sequencing to assess phylogenetic relationships among three recognized subspecies: tridentata, vaseyana, and wyomingensis. DNA sequence data from putative genes were pyrosequenced and assembled from 329 samples. Nucleotide diversity and putative haplotypes were estimated from the high‐read coverage. Phylogenies were constructed from Bayesian coalescence and neighbor‐net network analyses.• Key results: Analyses support distinct diploid subspecies of tridentata and vaseyana in spite of known hybridization in ecotones. Nucleotide diversity estimates of populations compared to the total diversity indicate the relationships are predominately driven by a small proportion of the amplicons. Tetraploids, including subspecies wyomingensis, are polyphyletic occurring within and between diploid subspecies groups.• Conclusions: Artemisia tridentata is a species comprising phylogenetically distinct diploid progenitors and a tetraploid complex with varying degrees of phylogenetic and morphological affinities to the diploid subspecies. These analyses suggest tetraploids are formed locally or regionally from diploid tridentata and vaseyana populations via autotetraploidy, followed by introgression between tetraploid groups. Understanding the phylogenetic vs. ecological relationships of A. tridentata subspecies will have bearing on how to restore these desert ecosystems.

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“…As moisture increases Wyoming big sagebrush gives way to basin big sagebrush and basin big sagebrush subsequently gives way to mountain big sagebrush; as elevation increases basin big sagebrush gives way to Wyoming big sagebrush which in turn gives way to mountain big sagebrush. In some situations, there is introgression and hybridization between the subspecies as well as other sagebrush taxa (McArthur et al 1979, 1988b, McArthur 1994. Since Euro-American settlement, big sagebrush populations have expanded and thickened in some areas within their broad original geographic range in response to some activities, e.g., livestock grazing.…”

Section: Big Sagebrushmentioning

confidence: 99%

“…Big sagebrush plants may produce hundreds of thousands of seeds annually (McArthur et al 1988b, Welch et al 1990). Seed production, however, can be greatly reduced by heavy browsing (Wagstaff and Welch 1991).…”

Section: Big Sagebrushmentioning

confidence: 99%

Adaptation and Success of Big Sagebrush and Rubber Rabbitbrush on Disturbed Sites

McArthur¹,

Stevens²,

Monsen³

1995

JASMR

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Restoration or reclamation of many disturbed sites in the western United States requires the use of the widespread native shrubs big sagebrush (Artemisia tridentata) and rubber rabbitbrush (Chrysothamnus nauseosus). Each of these species is taxonomically complex with numerous subspecies and populations that are adapted to specific habitats. Although big sagebrush is a competitive species, it is ordinarily late sera1 in niche, particularly in the secondruy successional processes of disturbed sites. In contrast, the common rubber rabbitbrush subspecies are early seral. The two species often grow together and are compatible in space and time in secondary succession processes. Matching the habitats of seed source and restoration or rehabilitation areas is a wise managemeot practice. Two case studies on successful long term (33 and 16 years) big sagebrush and rubber rabbitbrush disturbed site restoration are reviewed.

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Natural and Artificial Hybridization between Big Sagebrush (Artemisia tridentata) Subspecies

Cited by 73 publications

References 11 publications

Symbiotic regulation of plant growth, development and reproduction

Symbiotic regulation of plant growth, development and reproduction

Deep sequencing of amplicons reveals widespread intraspecific hybridization and multiple origins of polyploidy in big sagebrush (Artemisia tridentata; Asteraceae)

Adaptation and Success of Big Sagebrush and Rubber Rabbitbrush on Disturbed Sites

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