Response of RockyMountain Juniper Juniperus scopulorum Seeds to Seed Conditioning and Germination Treatments
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Data
2009
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Seed Technology
Resumo
Rocky Mountain juniper (Juniperus scopulorum Sarg.) seeds are difficult
to germinate in the laboratory and nursery due tomultiple dormancies. The
response of RockyMountain juniper to different seed conditioning and germination
treatments were examined. The viability of the original seedlot was
increased through seed sizing and weight separation. Following this, 21 germination
treatments were tested to determine their effectiveness in promoting
germination. Fiftheen new germination treatments were evaluated and compared
with the six best germination treatments cited in the literature.
Seed sizing did not affect seed viability significantly, but weight separation
increased viability about 7 to 10% formediumto heavy weight classes.Tree
germination treatments yielded the highest germination ranging from 45 to
55%. A warmstratification period followed by a cold stratification period produced
the best germination; increasing thewarmstratification from8 to 12 and
16 weeks improved germination.The best germination treatment was a 3 d water
soak, followed by 16 weeks warmstratification and then 13 weeks cold stratification.
Reducing the warm stratification period by 4 weeks was the second
best germination treatment. The third and fourth best germination treatments
were VanHaverbeke and Comer’s 90min peroxide soak and a 6 d 10,000 ppm
citric acid soak followed by warm and then cold stratification.
e study shows that additional seed sizing and weight separation coupled
with germination treatments are required to increase germination for
RockyMountain juniper seeds.
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Germination , Juniper