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Seed viability studies for recovery of Plagiobothrys hirtus (Boraginaceae), the rough popcornflower

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https://ir.library.oregonstate.edu/concern/defaults/zc77sr572

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  • Plagiobothrys hirtus is Oregon’s top priority for endangered plant species recovery, and the wetlands of Douglas County provide the only habitat for this plant in the world. The goal is to downlist this species from endangered to threatened, and in order to do that, existing populations must be protected, and new populations must be created. Genetic diversity plays a major role in the long-term viability of most endangered species, as their populations are small, however, little is known about the genetic diversity in populations of P. hirtus. Seed viability studies are one way to quantify genetic diversity, as germination is one of the many traits that can be observed indicating variation between individuals. Observing a wide range in traits among maternal lines indicates that there is a wide range in genetic variation within the population. We conducted these studies in the OSU greenhouses to examine variation in germination of maternal lines in four populations. Unexpected findings indicate that P. hirtus expresses dormancy, and that this dormancy is most effectively broken with cold stratification. Total germination was highest (and had the highest range) from maternal lines with the largest populations, and the highest assumed genetic diversity. These observations are consistent with our predictions. Seed management protocol was developed using these findings, providing information needed to create stable populations moving toward downlisting this species from endangered to threatened.
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