Narrow Hybrid Zone between Two Subspecies of Big Sagebrush (Artemisia tridentata: Asteraceae). V. Soil Properties

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

doi:10.1086/297531

Cited by 13 publications

(4 citation statements)

References 43 publications

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“…This, coupled with the greater plant‐to‐plant variation outlined above for middle hybrid zone plants, not only shows that there is a genetic basis underlying the differential performance of parental and hybrid plants across the hybrid zone, but also reflects the greater genetic variability of hybrid plants. As Wang et al . (1998, 1999) have argued, hybridization may provide big sagebrush hybrids with the genetic variability necessary to successfully occupy the highly heterogeneous environment of the middle hybrid zone site.…”

Section: Discussionmentioning

confidence: 81%

Nine-year reciprocal transplant experiment in the gardens of the basin and mountain big sagebrush (Artemisia tridentata: Asteraceae) hybrid zone of Salt Creek Canyon: the importance of multiple-year tracking of f itness

Miglia

McArthur

Moore

et al. 2005

Biological Journal of the Linnean Society

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We have studied reciprocal transplant gardens involving the hybrid zone between basin and mountain big sagebrush ( Artemisia tridentata ) in Salt Creek Canyon, Utah, for 9 years. Previously, we showed that the parental taxa and hybrids had superior reproductive and vegetative performance in their native garden. These earlier data supported the Bounded Hybrid Superiority model. Now, after 9 years, we find that the mountain seed source plants have greater relative fitness than middle hybrid zone seed source plants in the middle hybrid zone garden. These results may be due to plant density and climatic factors more conducive to mountain seed source growth than that of either basin or middle hybrid zone seed source plants. On the other hand, these fitness estimates do not take into account the timing of reproduction, which together with the age-specific survival rate, can profoundly affect lifetime fitness. The intrinsic rate of increase ( r ) takes both of these factors into account, providing another estimate of fitness. Middle hybrid zone seed source plants had the greatest rate of increase in both the middle hybrid zone and mountain gardens and a greater rate of increase than either parent in the basin garden. This is most likely due to the greater reproductive performance of middle hybrid zone plants earlier in life than either parental taxon. These results partly support the Bounded Hybrid Superiority model and show the importance of long-term studies of hybrid fitness.

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Section: Discussionmentioning

confidence: 81%

Nine-year reciprocal transplant experiment in the gardens of the basin and mountain big sagebrush (Artemisia tridentata: Asteraceae) hybrid zone of Salt Creek Canyon: the importance of multiple-year tracking of f itness

Miglia

McArthur

Moore

et al. 2005

Biological Journal of the Linnean Society

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“…Whitham, unpublished data;Eckenwalder 1996). Studies with these and other foundation species and hybridization gradients (e.g., sagebrush and oak species; Wang et al 1998Wang et al , 1999Madritch and Hunter 2002) suggest genetic variation may similarly effect ecosystem function across broad geographical scales through effects on foliar chemistry or other plant traits. However, while some ecosystem processes (e.g., N availability) may be sensitive to genetically based differences in plant traits, some may be less susceptible (e.g., P availability for our study).…”

Section: Discussionmentioning

confidence: 99%

Soil nitrogen availability varies with plant genetics across diverse river drainages

Fischer

Hart

Schweitzer³

et al. 2010

Plant Soil

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Understanding covariance of plant genetics and soil processes may improve our understanding the role of plant genetics in structuring soils and ecosystem function across landscapes. We measured soil nitrogen (N) and phosphorus (P) availability using ion exchange resin bags within three river drainages across Utah and Arizona, USA. The three drainages spanned more than 1,000 km in distance, 8°of latitude, and varying climatic regimes, but were similarly dominated by stands of Populus fremontii (S. Watts), P. angustifolia (James), or natural hybrids between the two species. Soil N availability was consistently greater in P. fremontii stands compared to P. angustifolia stands, and hybrid stands were intermediate. However, we found that the influence of overstory type on soil P availability depended on the river drainage. Our study suggests that, even with a near doubling of mean soil N availability across these drainages, the relative geneticbased effects of the dominant plant on N availability remained consistent. These results expand upon previous work by: 1) providing evidence for linkages between plant genetic factors and ecosystem function across geographic scales; and 2) indicating that plant genetic-based effects on nutrient dynamics in a given ecosystem may differ among nutrients (e.g., N vs. P).

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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. tridentata) and >1,880 m (mountain, 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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Narrow Hybrid Zone between Two Subspecies of Big Sagebrush (Artemisia tridentata: Asteraceae). V. Soil Properties

Cited by 13 publications

References 43 publications

Nine-year reciprocal transplant experiment in the gardens of the basin and mountain big sagebrush (Artemisia tridentata: Asteraceae) hybrid zone of Salt Creek Canyon: the importance of multiple-year tracking of f itness

Nine-year reciprocal transplant experiment in the gardens of the basin and mountain big sagebrush (Artemisia tridentata: Asteraceae) hybrid zone of Salt Creek Canyon: the importance of multiple-year tracking of f itness

Soil nitrogen availability varies with plant genetics across diverse river drainages

Symbiotic regulation of plant growth, development and reproduction

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