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Keyword: seed germination

Germination and seedling emergence of three semiarid western North American legumes

Publications Posted on: October 02, 2019
Few seed sources of North American forbs are available for revegetation/restoration of degraded western rangelands adapted to annual precipitation zones less than 300mm, and those that are available are mainly wildland collected. The amount of time and resources necessary to make wildland collections in quantity results in high seed prices and variable seed quality, such that forbs have been under-represented in rangeland seeding mixes.

A proposed mechanism for high pathogen-caused mortality in the seed bank of an invasive annual grass

Publications Posted on: August 17, 2018
Pyrenophora semeniperda can infect nondormant Bromus tectorum seeds under optimal germination conditions, but most escape mortality. This reduces pathogen fitness relative to infection of dormant seeds, which are almost always killed.

Breaking primary seed dormancy in Gibbens' beardtongue (Penstemon gibbensii) and blowout penstemon (Penstemon haydenii)

Publications Posted on: February 21, 2017
This study established that chilling removes primary seed dormancy in 2 rare penstemons of the western US, Gibbens’ beardtongue (Penstemon gibbensii Dorn [Scrophulariaceae]) and blowout penstemon (Penstemon haydenii S. Watson). Wild-harvested seeds were subjected either to moist chilling at 2 to 4 °C (36-39 °F) for 0, 4, 8, 12, and 16 wk or to approximately 2 y of dry storage.

Seed isolates of Alternaria and Aspergillus fungi increase germination of Astragalus utahensis

Publications Posted on: December 08, 2016
Astragalus utahensis (Torr.) Torr. & A. Gray (Fabaceae) (Utah milkvetch) is native lo the arid Great Basin and has desirable attributes that make it a good candidate for restoration in arid, noncompetitive situations. Seed dormancy is a significant barrier to consistent establishment for this species. Species of Alternaria and Aspergillus fungi have potential to enhance germination of A.

Seed and soil dynamics in shrubland ecosystems: proceedings; 2002 August 12-16; Laramie, WY

Publications Posted on: May 12, 2016
The 38 papers in this proceedings are divided into six sections; the first includes an overview paper and documentation of the first Shrub Research Consortium Distinguished Service Award. The next four sections cluster papers on restoration and revegetation, soil and microsite requirements, germination and establishment of desired species, and community ecology of shrubland systems.

Investigating new threats from emerging invasive plants

Science Spotlights Posted on: October 05, 2015
Forest Service scientists and partners developed an aggressive approach to investigate the biological and habitat characteristics of sickleweed (Falcaria vulgaris), a rapidly expanding invasive plant recently introduced into the grasslands of the northern Great Plains. Documenting patterns of invasion before species becomes widespread and identifying traits that may contribute to the success of recent invaders can increase our knowledge of factors influencing invasibility.

Growing native plants with biochar

Projects Posted on: April 16, 2015
Rocky Mountain Research Station scientists and their partners are evaluating biochar as a seed coating and as an amendment to nursery substrates to improve germination and growth of native plants. The goal is to reduce costs associated with restoring ecosystems.

Seed germination and sowing options [Chapter 9]

Publications Posted on: August 29, 2014
Seeds of many native species are challenging to germinate. One important thing a grower can do is to learn as much as possible about the life history, ecology, and habitat of the species he or she wishes to grow to understand the processes seeds from each target species go through in nature. Any observations will be valuable when trying to germinate and grow species that have little or no published information available.

The importance of good seed

Publications Posted on: March 24, 2014
The importance of seed to human culture and conservation of the natural world is briefly discussed. The effect of seed on seedling quality and cost is described through several examples and illustrations.

Environmental factors influencing Pyrenophora semeniperda-caused seed mortality in Bromus tectorum

Publications Posted on: June 26, 2013
Temperature and water potential strongly influence seed dormancy status and germination of Bromus tectorum. As seeds of this plant can be killed by the ascomycete fungus Pyrenophora semeniperda, this study was conducted to learn how water potential and temperature influence mortality levels in this pathosystem. Separate experiments were conducted to determine: (1) if P.

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