Seed germination, imbibition and anatomy were investigated in two lots of the U. S. federally listed plant Amaranthus pumilus. Final germination percentage (FGP) of A. pumilus seeds was most significantly increased by treatment with GA3 in combination with piercing
of the seed coat (FGP of 99% for both lot 1 [L1] and lot 2 [L2]). Pierced seeds treated with water had lower germination rates (FGP of 9 and 35% for L1 and L2, respectively). Unpierced seeds treated with GA3 exhibited 0% germination in L1, while L2 had a FGP of 14%. Unpierced seeds
treated with water had the lowest FGP with 0% for L1 and 1% for L2. Embryos excised from non-stratified seeds failed to grow following GA3 applications. While imbibition tests showed groups of pierced and non-pierced seeds both exhibited the greatest increase in mass within an initial
24-hour time period, dyetracking revealed that only some individual seeds imbibed. In seeds that showed imbibition, staining did not penetrate beyond the tegmen and did not reach the embryo or perisperm after 20 days. Seeds that showed no imbibition had significant funicular remnants. Histological
analysis of the seeds revealed the presence of both tanniniferous testal and exotegmen cells.
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Document Type: Research Article
April 1, 2016
This article was made available online on April 5, 2016 as a Fast Track article with title: "Imbibition, germination and anatomy of <i>Amaranthus pumilus</i> (seabeach amaranth) seeds".
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