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• W2352088476 abstract "Germination tests for seeds of many species require moist prechill at 2-5 °C to break dormancy. In practice, however, seeds are sometimes pre chilled at temperatures as high as 10 °C. To document the importance of prechill temperature and duration, seeds of 12 wildflower species native to Utah (Balsamorhiza sagittata, Castilleja applegatei, C. chromosa, C. flava, C. linearifolia, C. rhexifolia, C. scabrida, Cleome serrulata, Pedicularis groen landica, Penstemon cyananthus, P. eatonii and P. sepalulus) were subjected to a series of laboratory germination treatments with 0,4,8,12 and 16 weeks of prechill at 1, 3, 5, and 7 °C followed by 4 weeks of incubation at 10/20 °C. Viability evaluation for each species was estimated using a tetrazolium test. Seeds of all species were dormant without prechill, and very few of the col lections showed a significant response to 4-week prechill. Prechill at 7 °C was largely ineffective and only C. linearifolia and C. serrulata responded to prechill at 5 °C. Seeds of P. cyananthus and C. flava responded positively to prechill, but 3 °C resulted in slightly higher germination than did 1 °C. P. eatonii and P. sepalulus required more than 8 weeks of prechill at 1 or 3 °C for germination to exceed 35%. For seeds of B. sagittata, C. scabrida and C. chromosa, germination response increased with increasing prechill duration up to 16 weeks. Finally, C. rhexifolia, C. applegatei and P. groenlandica had maximum germination percentages < 40%, regardless of prechill tempera ture or duration. Discrepancies between maximum germination percentages and total viability indicate that prechill for periods longer than 16 weeks may be necessary for many seeds to germinate. Because such long periods are impractical for seed testing, tetrazolium staining or germination tests that include the use of dormancy-breaking chemicals should be considered. INTRODUCTION Seeds of many wild species are dormant at dispersal and require a period of moist prechill before they will germinate. Interest in testing seeds of wild species is increasing as these species are sold commercially for revegetation purposes and for native plant gardens. We included several species of Castilleja (Paintbrush) and Penstemon in this study because of the considerable interest in propagating these species from seed. Wild collected seeds are often expen sive, making an accurate evaluation of seed quality particularly important Susana H. A. C. Mogensen and Phil S. Allen,* Department of Agronomy and Horticulture, Brigham Young University, Provo, UT 84602, USA; Susan E. Meyer, Rocky Mountain Research Station, Forest Service, United States Department of Agriculture, Shrub Sciences Laboratory, Provo, UT 84606, USA. *Corresponding author. Received 11 April 2001." @default.
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• W2352088476 date "2016-01-01" @default.
• W2352088476 modified "2023-09-26" @default.
• W2352088476 title "Prechill Temperature and Duration are Important in Determining Seed Quality for 12 Wildflowers" @default.
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