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20 January 2014 Relating germination requirements of timber milkvetch to seral stage in the Interior Douglas-fir zone
D. J. Thompson
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Abstract

Thompson, D. J. 2014. Relating germination requirements of timber milkvetch to seral stage in the Interior Douglas-fir zone. Can. J. Plant Sci. 94: 723-726. Germination of timber milkvetch (Astragalus miser var. serotinus) seeds was studied to determine if it is an early or late seral species. Seeds were collected from a native plant population and those having a dark seed coat were selected. Germination tests were run in the light or dark and under three temperature regimes: low (constant 10°C), high (constant 25°C), and alternating (25°C day and 10°C night). Germination occurred over a protracted period with new germinants up to 90 d at the lowest temperature. Germination was not affected by light. Germination rate was greater at 25°C than 10°C, while fluctuating temperatures (25 and 10°C alternating every 12 h) reduced germination rate to that at the lower temperature. Days to 50% germination was a more sensitive indicator, with the mean for the fluctuating temperatures falling between those continuous to the high and low temperature. Final germination percentage was reduced at 10°C compared with 25°C, but not with fluctuating temperatures. Timber milkvetch seed germination did not respond to light or fluctuating temperatures, adding to a body of evidence that it is a late seral species.

D. J. Thompson "Relating germination requirements of timber milkvetch to seral stage in the Interior Douglas-fir zone," Canadian Journal of Plant Science 94(4), 723-726, (20 January 2014). https://doi.org/10.1139/CJPS2013-336
Received: 23 October 2013; Accepted: 1 January 2014; Published: 20 January 2014
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