Asclepias humistrata (sandhill milkweed) is a forb native to the Southern Coastal Plain of the USA, with potential use in restoration projects as a monarch butterfly larval host and as a low-input ornamental landscape plant. Yet, no information exists on dormancy or germination
of A. humistrata seeds. For that reason, the objective of this study was to describe effects of follicle maturity, seed size, temperature and photoperiod on A. humistrata seed germination. Thirteen seed lots were categorised based on follicle maturity at time of collection,
seed size (width), shared geographic location and collection year. Seed lots were exposed to varying temperatures and photoperiods, and germination data were analysed. Time-to-event analysis revealed follicle maturity at time of collection and seed size effect germination. High germination
(≥ 70%) was observed after 28 days in light (12-hour photoperiod) or dark, with constant or fluctuating temperatures. Optimal germination for seven seed lots occurred following exposure to 24-28°C and a 12-hour photoperiod at constant temperatures (18-34°C) after 28 days. Pearson's
chi squared analysis indicated higher germination in dark compared with light (12-hour photoperiod) after 14 days at 25°C for seeds from one of four geographic locations tested. This study pioneers germination dynamics for A. humistrata.
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Document Type: Research Article
December 1, 2017
This article was made available online on November 30, 2017 as a Fast Track article with title: "Follicle maturity, seed size, temperature and photoperiod effects on seed germination of Asclepias humistrata (sandhill milkweed)".
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