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Research ArticleRefereed Research

Influence of stratification, light, and planting depth on rabbitbrush seed germination and emergence

Stephen L Love, Robert R Tripepi and Thomas Salaiz
Native Plants Journal, June 2014, 15 (2) 109-118; DOI: https://doi.org/10.3368/npj.15.2.109
Stephen L Love
, Urban Horticulture Specialist, University of Idaho, Aberdeen R & E Center, 1693 S 2700 W, Aberdeen, ID 83210,
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Robert R Tripepi
, Professor of Horticulture, University of Idaho, Dept of Plant, Soil, and Entomological Sciences, Moscow, ID 83844,
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Thomas Salaiz
, McCain’s Foods, 218 W Highway 30, Burley, ID 83318, , (former Support Scientist, University of Idaho)
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Abstract

Rubber rabbitbrush (Ericameria nauseosa (Pall. ex Pursh) G.L. Nesom & Baird) [Asteraceae]) has potential for use as an effective element of water-conserving landscapes. To enhance availability of this species, it is important to optimize nursery seedling production. Our objectives were to determine the influence of 1) stratification (coldmoist); 2) light exposure; and 3) planting depth on germination and emergence of seeds collected from diverse populations of rubber rabbitbrush. Seeds representing a range of environments were collected from Idaho and Utah and were cleaned, sorted, and exposed to germination-enhancing treatments. Following stratification, seeds of 3 of 4 rabbitbrush populations responded with a statistically significant increase in germination percentage. More significant, stratification increased the germination rate, reducing time to culmination from 4 or more wk to 1 wk or less. Compared with seeds germinated in the dark, exposure to sunlight increased germination percentage 1.5- to 3-fold, depending on population. Any amount of seed burial markedly decreased seedling emergence for all 4 populations. Six wk after planting, removal of all but a few mm of soilless substrate resulted in emergence of a portion of the buried seeds, indicating induction and release of conditional dormancy (possibly quiescence) due to a lack of light or other factors. Responses to stratification, light, and seed burial varied by population, thus confirming previously described variability that exists among rubber rabbitbrush populations. Results of this study will help nursery growers provide optimal conditions for producing nursery stock of rubber rabbitbrush.

  • Ericameria nauseosa
  • viability
  • ecotype
  • population
  • seed burial
  • dormancy
  • Chrysothamnus
  • Asteraceae
NOMENCLATURE
  • USDA NRCS (2014)

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Native Plants Journal: 15 (2)
Native Plants Journal
Vol. 15, Issue 2
20 Jun 2014
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Influence of stratification, light, and planting depth on rabbitbrush seed germination and emergence
Stephen L Love, Robert R Tripepi, Thomas Salaiz
Native Plants Journal Jun 2014, 15 (2) 109-118; DOI: 10.3368/npj.15.2.109

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Influence of stratification, light, and planting depth on rabbitbrush seed germination and emergence
Stephen L Love, Robert R Tripepi, Thomas Salaiz
Native Plants Journal Jun 2014, 15 (2) 109-118; DOI: 10.3368/npj.15.2.109
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Keywords

  • Ericameria nauseosa
  • viability
  • ecotype
  • population
  • seed burial
  • dormancy
  • Chrysothamnus
  • Asteraceae
  • USDA NRCS (2014)
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