Publication Date:
1981-09-01
Description:
Fresh seed from seven clones of Populustremuloides Michx., and seed from the same collections stored at −18 °C for 1, 6, 12, and 24 months, were germinated at five water potentials (0, −2, −4, −8, and −12 bars; 1 bar = 100 kPa) and two night–day temperature regimes (20–30 °C and 15–25 °C).Germination was not significantly reduced at any moisture stress used, by storage. Average germination of fresh seed at 0 and −2 bars was 94%. Germination at −4 bars was 61% with much variation among clones and between temperature regimes. When the effect of temperature was significant, the 20–30 °C regime was the better. At −8 and −12 bars, little or no germination occurred.Coronet development occurred on at least 85% of the seedlings from all clones, after all storage times, under either germination temperature regime, at moisture stresses up to and including −8 bars. At −12 bars, coronet development occurred much less frequently, and the 20–30 °C temperature regime was the better. Cotyledon expansion occurred on at least 80% of the seedlings at moisture stresses up to and including −4 bars. At −8 and −12 bars, the frequency of cotyledon expansion dropped, and the 20–30 °C temperature regime was the better.
Print ISSN:
0045-5067
Electronic ISSN:
1208-6037
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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