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Reproduction and development of the endangered s edum integrifolium ssp. leedyi (Crassulaceae)
Author(s) -
Olfelt Joel P.,
Furnier Glenn R.,
Luby James J.
Publication year - 1998
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.2307/2446327
Subject(s) - biology , germination , endangered species , population , perennial plant , botany , outcrossing , inbreeding depression , reproduction , seedling , horticulture , inbreeding , ecology , pollen , demography , sociology , habitat
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 ( N e / N ), but not with N e . 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.