RT Journal Article
SR Electronic
T1 Evaluation of thermal, chemical, and mechanical seed scarification methods for 4 Great Basin lupine species
JF Native Plants Journal
JO NATIVE PLANTS JOURNAL
FD University of Wisconsin Press
SP 5
OP 18
DO 10.3368/npj.17.1.5
VO 17
IS 1
A1 Covy D Jones
A1 Mikel R Stevens
A1 Von D Jolley
A1 Bryan G Hopkins
A1 Scott L Jensen
A1 Dave Turner
A1 Jason M Stettler
YR 2016
UL http://npj.uwpress.org/content/17/1/5.abstract
AB Seeds of most Great Basin lupine (Lupinus spp. [Fabaceae]) species are physically dormant and thus, difficult to establish in uniform stands in seed production fields. We designed this study to examine 5 seed scarification techniques, each with 11 levels of application (including a non-scarified control), to reduce the physical seed dormancy of longspur lupine (L. arbustus Douglas ex Lindl.), silvery lupine (L. argenteus Pursh), hairy bigleaf lupine (L. prunophilus M.E. Jones), and silky lupine (L. sericeus Pursh). These 4 perennial Great Basin lupine species are of interest for both rehabilitation and restoration of degraded rangelands. We evaluated 10 treatments of each of 5 scarification methods, one mechanical, 2 thermal, and 2 chemical (sulfuric acid and sodium hypochlorite) techniques on the above-mentioned species. The sulfuric acid and the mechanical scarification treatments significantly improved germination for both silvery and silky lupine. Additionally, one thermal scarification method (60 s at 95 °C [203 °F]) was effective for silvery lupine. Both sulfuric acid and sodium hypochlorite scarification methods had treatment levels that significantly improved germination of hairy bigleaf lupine. For longspur lupine, all treatments within the 5 scarification methods either decreased or were not a significant improvement of germination as compared with the control, except for the treatment of soaking the seeds for 35 s at 95 °C (203 °F). We found scarification to be an effective tool for reducing physical dormancy in silvery lupine, hairy bigleaf lupine, and silky lupine, thus allowing for a more efficient use of limited seeds.