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American Journal of Botany, Vol 85, 346, Copyright © 1998 by Botanical Society of America, Inc.

REPRODUCTIVE BIOLOGY

Reproduction and development of the endangered Sedum integrifolium ssp. leedyi (Crassulaceae)

JP Olfelt, GR Furnier and JJ Luby

Information on reproduction and life history is important for the conservation of endangered plants. We investigated rates of flowering, seed set, and germination in populations of the endangered perennial plant Sedum integrifolium ssp. leedyi. Germination and flowering rates differed significantly among populations, but seed set rate did not. We assayed 26 plant clusters (81 stems) from four of the five known populations for evidence of clonal reproduction using 28 randomly amplified polymorphic DNA (RAPD) markers. Of the 81 stems, 75 had unique genotypes and three pairs had identical genotypes, suggesting that clonal reproduction is infrequent. Flowering, seed set, and germination rates were correlated with our estimates of ratios of effective to actual population sizes (Ne/N), but not with Ne. The single formally protected population may be experiencing inbreeding depression. We grew plants from seed to maturity in a greenhouse, with a germination rate of 77% and survival of 98% of the germinants at 6 mo, suggesting that this will be a viable means of ex situ propagation. Plants flowered 4-6 mo after germination and produced mature fruits 1-2 mo later, suggesting that they have the potential to sexually reproduce in their first or second season of growth.


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J. P. Olfelt, G. R. Furnier, and J. J. Luby
What data determine whether a plant taxon is distinct enough to merit legal protection? A case study of Sedum integrifolium (Crassulaceae)
Am. J. Botany, March 1, 2001; 88(3): 401 - 410.
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Copyright © 1998 by the Botanical Society of America, Inc.