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Population, Temperature, and Substrate Influences on Common Milkweed (Asclepias syriaca) Seed Germination

Janis M. Farmer, Steven C. Price and C. Ritchie Bell
Weed Science
Vol. 34, No. 4 (Jul., 1986), pp. 525-528
Stable URL: http://www.jstor.org/stable/4044231
Page Count: 4
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Population, Temperature, and Substrate Influences on Common Milkweed (Asclepias syriaca) Seed Germination
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Abstract

Seed from 21 common milkweed (Asclepias syriaca L. # ASCSY) populations from six states were germinated on six substrates (filter paper, sand, peat, clay, and mixtures) under three temperature regimes. The variation in germination response between populations and experimental conditions was analyzed. The greatest percent germination (59% average over all substrates) was obtained with an alternating 20 C (16 h), 30 C (8 h) temperature regime. At a constant temperature of 30 C, germination was lower (32% average) and much more variable among seeds from different populations. At 25 C, average percent germination dropped to 1.2% over all substrates. Germination appeared to be strongly correlated with seed source (population), temperature, and substrate type, and poorly correlated with seed size. No association was found between geographical origin and germination response.

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